Live from CERN: Behind the scenes at the ATLAS Experiment Control Room

foreign [Music] and welcome to the control room of the atlas experiment at the LHC here at CERN my name is Stephanie and together with my colleague Liao Chan we will take you on a tour through the atlas control room yes um hello everyone my name is Leo Shan and welcome to join this live event I am the event display coordinator of Atlas and today here we are going to take you on a tour in the atlas control room where we will be visiting several desks in the control room and talking to some data and operation experts who will help us to understand what is happening and how things works at the end of this tour we will come back here for Q a session where we will answer your questions so feel free to post all your questions in the chat to first put into perspective where we are right now so 100 meter below our feet we have the atlas Cavern with the atlas experiment and the LHC the LHC accelerates particles to almost the speed of light and then brings them to Collision in the Lac experiments like Atlas and the atlas detector wants to measure all of the particles that are created in these collisions and the detector is built out of several layers which are dedicated for to detect specific particles so the innermost layer closest to the collisions is the inner detector which measures charged particles then we have the calorimeters where most particles get stopped and leave all of their energy and then the outermost layer are for muons because muons they just pass through the Colorimeter almost like it's nothing but we still want to measure them yeah and our tour will start from right here um you should be able to see a map of the control room and starting from where we stand first we will visit the station of ship leader and run control where we'll meet our wrong coordinator our second step will be the trigger desk where we will meet our trigger and level 1 catalog experts and then we proceed through the front of the room and arrive at the inner detector desk where we meet all the detector experts here finally we will come back here for Q a session so let's start our tool now and now we are heading over to the to our first station which is the shift leader and around control desk it's right in the center of the room and we arrived and we are now here with one of our one coordinators Sylvia hello Sylvia can you tell us what's going on right now hello yes I'm Syria uh it's going on we have stable beam in the accelerator that means that we have stable collisions you can see from the screen here this is the page page one is called how Lac communicate with us instead we have protons and stable beam so that means that we are taking meaningful data and here we have the profile of how the collisions look like in terms of Luminosity from us from CMS so we came at the perfect time um can you explain us a little bit more how a detector is operated and how everything is set up yeah so we learn basically in the morning from LSC what is the plan now we are not yet with the full ringer that means we are not yet in stable configuration they are in the intensity ramp up that means that they are waking up from the winter shutdown and before summer that need to increase One By One The parameters the first the number of munchies and then the intensity so basically for us means that every day is different so we have to organize very carefully with all the subsystem involved in the operation the data taking so in the meeting in the morning we organize everything we set the plan of the day that we draft here and the shift leader that is on my left need to follow up during the day since we are in operation they are here day and night and we follow up um depending on the as I said the plan that was drafted and we need we needed to take data so here you have the Run control igui where we put all the detector of the atlas experiment in running State consistently and we also check that everything is green here let's say everything inconsistent with the voltages readout and so on thanks a lot Sylvia I see a lot of green so it looks like everything is running quite smoothly [Laughter] so thanks a lot Sylvia we will continue our tour now where do we go next okay thank you Syria now we leave the ship leader and run control desk and we move on to our next station which is the trigger desk here is the trigger desk and my co-host Stephanie is in charge of this desk she's a super expert in the trigger system so Stephanie do you want to tell us something about the atlas trigger system yes so the LFC collides particles every 25 nanoseconds so this means we would get 400 million events every second this is way too much for us to read out process and then also analyze so we have to select the events which are interesting and to do this we use the so-called trigger system it has two stages a level one and an HTT stage at the first stage we make a rather rough course decision but it needs to be very quickly and at the second stage we have a little bit more time and there we can run already some more sophisticated algorithms to select interesting events and that's with this we then cut down the number of events we record to about 1 000 per second so and now we want to know a little bit more about the level one system and we have one of our level one trigger experts here Reese from level one Carlo hello Reese hello can you please tell us a little bit more about level one Carlo okay so as the name suggests the level one callow well the level one callow is the level one calorimeter trigger so we use the calorimeter information to try and do this first pass of cutting down the data from the 40 megahertz of the LHC collisions down to a hundred thousand times a second that we can ship to the higher level trigger so this is done we use the calorimeter information which is the energy deposition and we have about 7 000 channels which we're looking at in real time to try and search for interesting clusters of uh energy in the detector and select those events for being saved so what is new for level one Carlo for Run free for data taking now so for run three we've had an upgrade we have upgraded modules on both our side and on the calorimeter side so on top of the 7000 channels that they're sending for the Legacy path now from the liquid argon calorimeter we get 10 times more information and that gives us a much better granularity and it means we can more clearly see the Clusters that we're selecting and make better decisions so we can make a more precise selection of the events that we want to keep offline so that more good events go into analysis thanks for use this sounds really good and this will make many analyzers very happy thanks a lot again and now we continue our tour where do we go next um so yeah let's continue through the front of the room and we just leave the trigger desk now we are passing through two important desks in the control room the data quality desk which is the data quality shifter sits here and then they will monitor the quality of the data we record Another desk is the slimos desk where the shift leader in matters of safety guarantees the safety of both the detector and the operation crew so now we are proceeding to our next station um which is the inner detector desk and the inner detector is controlled here but at this desk we are going to meet all of our detector experts before we talk to our first expert a quick reminder please post your questions in the comments so that we can answer them in our q a session right after our chat with our detector experts so the first detector expert we talked to is vinishes and he hello and here is an expert on the inner detector can you tell us please a little bit more about the inner detector yes so the inner detector is the first layers the inner layers of the of the detector in Atlas so it's the detector that is responsible for receiving like pers detecting all the little signals left by charged particles and the uh you know the closest points uh to the point of interaction so our closest detector which is the IBL um is at 3.3 centimeters from the from the beam pipe where the collisions actually happen and then from there we have our pixels as CT and trt which are all inserted inside the magnetic field and with information from these detectors we can figure out what's the position where this particles came from what actually happened in the collision and the energy momentum of all the particular particles coming out of it okay so a lot of different detectors here so um what are the challenges for the inner detector or in particular pixel for Run free well I think uh as the unit detectors the innermost we have to like really cope with this uh amazing amount of data the LHC provides so right now we are operating at 50 collisions every time that the beams Collide we have 60 50 60 collisions uh proton proto-proto collisions at the same time so we have to deal with huge amounts of data and occupies you know the detector and all this radiation that affects uh our silicon attacks very much so we need to be very careful to operate this uh and such that we provide good data for physics reconstruction and for this you also need to monitor the in a detector systems very closely and I see you have a lot of screens and windows open here can you tell us a little bit what we are looking at yeah so uh if you are if you are a shifter you can your first job is to look at these things that are luckily very green because they are the safety of the detector so here you have the entire inner detector in one page in which uh you're looking over at pixels at CT and trt and they are uh all you check the temperatures and whether or not they are configured correctly and then here in pixel you can see all of our layers they're also uh operating very well and then on the left you can see uh here I put the display of what the data stream from our detectors look like so this is live and you can see we're taking collisions and you you see that we we have data coming coming from all of our pixel detectors it's it's cool that you came today because then we have we are quite busy yeah yes indeed perfect timing so one final question for you it's a little bit more personal why do you like to do this job why do you like operations um to be honest I like it because it's addictive uh it's it's high pressure but it's also very satisfying when things work out and uh you you know like uh you have these conditions which are the hardest that any experiment has ever operated under and we still manage to just take great physics data it's uh it's I don't know it's very rewarding I agree thank you so much for your insight into the inner detector I leave you to work now okay for those who just join us we are in the atlas control room and now we are at the inner detector desk where we will be speaking to different detector experts for the atlas operation um we just talked to the experts from the inner detector and outside inner detector we have the calorimeter system so in the control room you can see just right behind the inner detector desk we have the calorimeter system desk but the shifters are busy there so we are not going to disturb them but we have an expert for the calorimeter system so hello Adriana hello um yeah so can you tell us something about the atlas calorimeter system uh yes so in Atlas we have um two major calorimeter systems so first off calorimeters are for measuring the energies of particles and we have it in two parts so one part is the liquid argon calorimeter which measures the energy of particles such as electrons and photons and then we have the tile color method which is a hydronic calorimeter so it measures the energy of hydronic particles and their kind of liquid iron is wrapped around Dana detector and then outside of that you have the the tile calorimeter and they are based on different Technologies so um one is has as an active material we call it which is measuring the impact of particles with liquid argon which is a noble gas and the other one is using scintillating tiles okay so we have two different Technologies for the others parameter system and then do we have something new for round three yes um so uh especially on the side of the electromagnetic so the liquid argon we had a major upgrade uh you've heard already before from Rhys from level one callow that the calorimeters are now sending much higher granularity information to the trigger so more information is always good you can better decide what an event that you that you have in in your detector is interesting or not and using this information which is now available already before on trigger level we can decide in a better way whether an event that we observe in Atlas is something interesting for physics potentially interesting or not so yes this is one major upgrade that a lot of people have been working on not the detector itself was upgraded but mainly the readout but nevertheless is a very long and very very interesting upgrade yeah so the upgrade of the calorimeter system is actually the the hardware basis for we have better performance in the level one catalog system and then we are not visiting the shifters today but maybe you can tell us something about what the shifters usually do during their shifts the shifters are busy I'm not that I'm here we are the shifters are monitoring our system 24 7. [Music] we have shifts like turnarounds every eight hours and they're looking what are the data that we collect from in this case perimeters so tile and lar liquid argon um are good data and they have screens or panels such as this one which you have probably seen with the pixels so ideally it looks like this everything is green we like green um and in this case everything is running fine which is good because we're in stable beams which means you're collecting data and if there's a problem if a problem occurs the shifter uh usually directly calls don't call Expert who then can solve ideally the problem as quick as possible so yeah and I also see a colorful map here it's this also related to the calorimeter operation it is a map from level on callow but we do start it a lot because it displays the noise that is existent in our calorimeter in the in this case this is uh the so-called jfx rates oh if I could figure out this mouse so here we see in which region the the detector is noisier and in which regions it's less it's less noisy and if a problem occurs you will usually spot it easily in this kind of map thank you very much very much Adriana so now we go to our third and last detector expert and we are here with Kostas hello casters and as many of you might already guessed when we introduced uh briefly the atlas detector the outermost layer is the myON spectrometer and Costas can you please tell us a little bit more about the myON spectrometer yes so uh the the minion spectrometer the primary job of the system is to detect and measure the properties of the of the immune so the immunes are towards the particles Elementary particles that as you said the penetrate the full detector so that's why also the immune system sits at the outer layer of the atlas detector and it's a very large system so it is composed of five different gaseous detector technologies that they are covering a very large detection area larger than a football field and they has in total about 3.5 million electronic channels that we are reading out in order to detect those those new ones so it's it's a rather large system the detector Technologies you can also see here in our display are MDT or pctdc and now recently micromegas and sddc which is one of the upgrades thanks for this overview of the myON spectrometer and you already mentioned the word upgrade so there is something new what is new for the Neons uh 413 yeah so it's um we had a rather big change in the immune spectrometer during the last long shutdown period which lasted from 2016 to 2018 so for us the biggest upgrade was the um the construction and installation of new detectors we call this new small wheel so this replaced the old small wheels that we had in the experiment the small in the naming of the project is rather unfortunate because these are 10 meter diameter detectors so these are large in fact and quite complex so that's also been quite a challenge for the collaboration to construct those and also to install them in Atlas and commission them and this were installed in 2021 and are taking data since last year and these are already integrated inside the the rest of the immune spectrometer so you see them here in our nice DCS display so the not so small and new small wheel how did it feel when you saw it running for the first time being switched on and the first muons being detected with the newsmovia yeah this was quite the moment I admit since uh a lot of us have been working also in parallel to the operations of the Legacy immune system also to the construction of the new small wheel for for years so it's a really rewarding moment when you see you know something that you have been building from uh from very small this is small detectors to this large system 10 meter diameter to install it and take data without together with the rest of the atlas subsistence this has been a quite exciting moment for everyone it's truly nice to see that it's now also running after so much hard work from so many people so you have also a lot of screens here and again we don't want to disturb Demian shifter who is very busy and monitoring the my own system on the other side of the room but maybe you can tell us a little bit what um what needs to be monitored what do the shifters need to look out for carefully yeah the so the the standard and actually the first the most important thing is to monitor the the state and status of the detector of our Hardware so this is like the health of the detector and for this we are relying on on the atlas detector control system which has you can see here a snapshot of that it is built in hierarchy so in the tree structure so that each of the thousands of Hardware elements that we have are interconnected industry structure and we can detect even if a single element goes bad it propagates stating the status up to the top level and we can see it because of course it is impossible for someone to watch in parallel thousands of elements right so we have this this structure so this is one thing this also allows us to quickly react on problems so this allows us to increase the efficiency of our detectors right and then the other thing is the data so here we are monitoring that the quality of the data we are we're taking is good and as expected because this data of course are maybe done for Atlas for the Reconstruction and the analysis eventually that we are performing so these are two main tasks and the shifter is also supported by on-call experts that you see here the list that we have because the shifter of course cannot know everything so whenever there is a problem that he doesn't understand he calls how much that's interesting um how does it work so I mean I'm in shifter now I look at something and something looks weird but I don't know why or what what what would I do yeah so then of course there are we have we have a documentation of course where one can look at known problems or issues or and if there is an easy way to solve this but otherwise in order not to lose time because such problems may also affect the data taking we have people that are on call 24 7 they have shifts and they are being called to react quickly and try to solve this problem together with the shifter so we rely also on those experts for for running our system okay so they can also be called in the middle of the night yeah anytime 24 7. but hopefully everything is running smoothly and they don't usually yes not always of course okay thanks a lot Costas for your Insight at immune spectrometer and yeah good luck with the newsmobile that everything went smoothly also this year thanks a lot so now we are going um to uh so now we are done with our detector experts but we want to talk to another expert Liao Shan so Liao Shan already introduced herself at the beginning that she is an expert and in charge for the event displays and maybe some of you already spotted some pretty uh pictures in the background and also I went this place India can you tell us a little bit more about those pretty pictures yes um so event display is a tool that visualize the events we've been talking about particles tracks Energy deposits mules and so on but what do they look like um so event displays is such a tool that it can translate the data into some images and we have several event displays in Atlas the one you see uh here is called Atlantis usually we project it on the wall as you can see in the background but we are projecting the same thing on this screen here so from this image you can actually see the particles interactions inside the atlas detector and we have several different views here so this one is the XY view it's perpendicular to the beam Direction so it allows us to see more activities in the transverse plane so-called and then we have a different zoom in version of this so that we can actually see different parts of the detector for example this one is zoomed into the very inner part of it so we can see the activities in the inner detector and you can see the hits the tracks and many things going on there and outside the inner detector we can see the calorimeter where you see some Energy deposits showing in a yellow yellow blocks and then outside the calorimeter we have the muon system where you see all the tracks of the mule and then at the bottom we have a side view of the atlas detector so that we can see more activities along the pin Direction and finally at this corner you can see a legal plot which is showing the energy deposits inside the calorimeter system things for the explanation of the event displaysan and I thought that they were changing all the time are those event displays of the collisions that are happening right now yes we are coming at the right time that there are some real collisions happening in the atlas and the events you are seeing here is in life in real time so we reconstruct the data we just recorded a few seconds or 10 or 20 seconds ago and with the fast reconstruction they are they are showing here as an images and we can really see the activities in the detector in real time so at the trigger disk we learned that we record around 1 000 events every second do you make an event display for each of those events yeah this is a very interesting question um so with an event rate of 25 nanoseconds per event it's impossible to see all of them and even with the help of the trigger system the output rate is reduced to a few thousand events per second it's still not possible for us to see every one of them fortunately we don't have to see every one of them and we only sample a subset of the events um yeah and then with this one we can see the time changing of the status of the detectors and then the shifter can take a look at some randomly sampled event to learn the current status of the detector so this is what we are doing and what the data quality shifter is doing in the control room and can only the data quality shifter look at those event displays or the other shifters as well yeah the other shifters can also take a look at the event displays so they have their special configuration and then they can interact with the events to zoom in into a particular sub detector or to change the projection to another view so that they can analyze the events in real time and they can also talk to their experts and the experts can open the events outside the control room with also the the real-time events that we are producing in the control room so that the experts can use them to communicate with the shifters and understand problems and I see that these event displays are also shown on the wall projected for everyone who's in the control room and especially when we get to First collisions in the year people are looking at this point uh very closely to see these nice event displays thank you so much to your Sean for explaining us the event this place and showing us these beautiful pictures so with this we are at the end of our tour and now it's time for our q a session okay let's move back to our starting point and to everyone who is watching or connected late so we are in the address control room you missed the tour but the video will be available afterwards for watching so um you can go back and for everyone who followed and might have uh some questions now you still have time to post them in the comments and we try to go through all of them and yeah now we are back Leo Sean is with me and also Sylvia our one coordinator is back so to get the questions let me quickly [Music] okay so our first question is from I am maida I hope I pronounced the name correctly and the question is what is atlas Recent research Focus can you tell us what is atlas Recent research Focus yeah so atas is a general purpose experiment and then we have many Frontier topics in Atlas for example for the Higgs boson we know we just celebrated it's 10 years anniversary of the discovery last year but there are still some mystery of the exposure for example we still don't know the self-coupling of the Hicks and that is the current Focus one of the current focus in the air traffic experiment that we are studying the daihix production and also on the other hand we have some mystery with the dark matter and with some extra Dimension with some long leaf particles many many of that and that's all covered in the atlas our next question is from Leandra and then I asked how many data will you save today for analysis later Syria can you tell us how much data today we saved about a terabyte of data in the current run yeah that's quite impressive that's a lot of data to analyze but you look very happy about it oh yes everything was smooth and we hope on our analysis team is happy with those data and we can extract something interesting thanks Syria our third question I unfortunately don't have a name oh but that's a fine so the question is how many people are involved to make Atlas happen oh that's a good question there are a lot of people involved in making Atlas happen and it's also a question for what stage so we need a lot of people to build the address detector but then also to operate it and then also to analyze the data so uh do you have a rough idea how many people are involved in the detector operations so in operation I would say hundreds and then there are I would say thousands of people who built the detector and might not be any more in operation and then many others to analyze data and yeah so thousands in total and of course this also changes over time right people are coming and leaving the collaboration um so at the end to our fourth question from floor um if the Adler if Atlas could be improved what would it be an inner detector even closer than 3.3 centimeters to let's say one centimeter from the collisions better computing power or more sensitive detectors so there are already some suggestions do you want to add anything to this um yes so we have some ongoing projects for the atlas upgrades it's called The Phase 2 upgrade this includes uh updating our inner detector to a silicon based so that we will have a large radius silicon based detector which has a better resolution for the hits and for the tracks and with that we can measure the charge particle momentum into higher Precision so that's one of the projects that the atlas upgrade team is working on and there is another project called the high granularity timing detector it's part of the detector that we put in the end cap reach so that other than the three-dimensional position information we also measure the time of the arrival of the particle so that we have a fourth dimension this helps us to reject some multiple interaction that happens in a single Collision so that we can reject our background and measure the signal better thanks Liana so there is truly um a lot to look forward to for the future so our next question is again from floor can the LHC also collide muons together or are they too short-lived or can the LEC only do proton proton collisions Syria since you are working very closely with the LHC can you answer this question so Nuance are not yet in the program but there are heavy ions in the program so LEC instead of colliding protons can Collide ions of lead we did also ions of Casino in the past and in the future results in the program to collect oxygen and depending on the collisions of the different elements that you have you have a different kind of physics that you can analyze and you can explore but today what what did we see today in the event this place where there's proton collisions or heavy iron collisions the standard religious physics is proton proton collisions and this is in round three is 13.6 TV so this is the standard towards the end of the year for one month this year we will have a lead lead collisions and for this you can just continue as it is or you need to do special preparations of course we need special preparation we have a new detect not a new but uh the so-called zero degree calorimeter detector that we will insert in purpose only for heavy ions and then of course on a trigger side we have a separate menu that we have to prepare in advance and use is not the standard physics that we are going to explore so we have completely different signatures let's say okay so it will never get boring okay our next question is from maguria tari how does it feel to do work on the very tip of Science and knowledge will you realize if or what kind of special event happen while the experiment is running or only when you filter the data so you want to answer this question yes um so I think this is a more trigger-like question that how we select interesting events um usually what we see in the control room we have we have a feeling about uh that something is going on like we are starting the uh 13.60 regulation at the world record energy that's something we can tell immediately but then uh in terms of whether we are producing some Higgs events and some other interesting events that's something that we need to analyze the data and then we need to apply some requirement on the data and filter it so that we can really select those events things but yeah indeed at the end we have to look at all of the data also to make sure that it was not just a fluke or by chance so um yeah we can't just tell from looking at one event display for example but we have to look at all of the data so the next question is from Kiara how many people are usually on shift in the control room this sounds like a question perfect for Sylvia yes we have eight people on shift 24 hours so we have shifts of eight hours from seven to three from three to eleven and from 11 to 7 in the morning those are the shifters and then we have many experts at the phone that live in the area and as soon as there is a problem shifter can rely on them and they can come quickly here to the control room in case there is a problem to be sold and do you prefer when all of the experts are here and it's very crowded or rather wins only the eight deck shifters I prefer when it's crowded but that means because there is something interesting and also if this cloudy might be also that there is a problem so okay it depends what we prefer let's say when it's quiet and we are taking data then it is only shifters so that is also a good thing thanks Silvia our next question is from Russell and Russia asks them where do the protons come from before they circulate in the LHC um so yeah the the protons don't just come we can't just put them in the LHC um so first they come from an oxygen bottle where all of the LX ones are stripped off and then the protons are accelerated first in a linear accelerated accelerator and then in several circular accelerators so and with those we increase the energy step by step because we can't just go from zero to the maximum energy of the LHC almost speed of light so we have to do it in status and yeah the LHC is then the final accelerator where they will then also collide our next question is um from three people Oscars I guess a lot of people are excited about this from Clara Amelia and John can you tell us about the ducks in front of the inner detector shifter what is the function of the rubber ducks say that you are laughing what are the Ducks for tax state for that acquisition so that is we have the duck in front of the inner detector but could be in front and the that acquisition computer and yes that's it for that so to acquire all the data we need the data acquisition system and so that is our mascot basically and also um when sometimes the shifters are all by themselves in front of the desk and there is an issue sometimes it helps just to talk to someone and and you can explain a problem to a duck and this offense already is enough to realize what is going on or to find a solution so our next question is from uh again from um maida what are the challenges of the inner detector who wants to take up this question the challenges for this year are that LEC is pushing in terms of a number of colliding interactions so we have the so-called pileup that means this in the same in the same Collision we have many events overlapping one on top of the other and the Indian detector as the full Atlas detector was built 20 years ago with the conditions that were supposed to be at that time by Design and now Alice is performing so well that we are exceeding the design and so one of the challenges for our internet detector is the radiation damage and also to be able to record all the tracks at the same moment so we will have more than 60 events overlapping one over the other and the inner detector is so close to the interaction point that is not is not easy to distinguish between one and the other wow so it's really um quite amazing that the inner detector is performing so well although it was designed for quite some different conditions thanks Syria so our next question is from Danielle Danielle how will this benefit Society it's an interesting question how that's what we are doing here benefits Society um it's an interesting but difficult question um so fundamental science is something like we we do it uh because we have curiosity of how nature works and then we explore the nature we we realized that we understand the fundamental rule of the nature and then maybe after many years ago we realized that we can make use of the rules to make our life better so this is not something immediately happen but it will happen in the future and then we have to have the launch addition to to proceed on this way so that we have continuously some some people contribute to this area so that we can continuously improve the our life and also on the side of detectors and the accelerators the techniques that we need and the materials they often yeah they often don't exist before so we need to develop in or find out how it works and then in a couple of years this might also be beneficial outside of science so um there is also this aspect that we can give like a form of uh yeah technological knowledge and so yeah you want to add something to this yeah many detectors that are developed here for the accelerator experiments are developed from scratch we study them we bring to the we bring the performance to the Limit and then like once we studied and we use like the same technology can be used for example in medicine that is a case that is very well used so that is something or in astronomy so yeah that is how we could benefit from the society thanks Sylvia our next question is um from floor again and this is actually a question directly to Liao Shan where can you see which direction the particles curve so you can tell it's a matter or an antimatter particle right this is a very interesting question so we measure the charge particles in the detector because they leave hits and then they leave tracks we can reconstruct the hits to build tracks and then we have the magnet system in Atlas to bend the trajectory so if a particle is the positive charge they are bent into One Direction and if they are negative in charge they are bent into the other direction so a particle and its antiparticle if they are charged they have different charges and then with the direction of the tracks we can tell if it's a particle or an antiparticle our next question is from either what is the power consumption of the experiment currently so yeah I'm wondering about this myself do you know no I don't have one um I would say I don't have a number I really I'll send you you know no no I'm not on top of my head [Music] um sorry we can't answer this question on top of our heads um so the next question is from Risha um and there are actually two questions so the first question is about the event displays and uh us is the event display called uh hypatia um we have one event display called Harry Potter yeah we have several event displays in Atlas and some of them are two-dimensional some of them are three-dimensional for the two-dimensional one Atlantis it has some different variations and one of the variation is called hepatia and it's mostly used in education thanks to yoshan so now the second question from Richard I think it's more for Sylvia um I just want to know a little bit more about the new small wheel so we already heard a lot from Costas but maybe you want to add something to that what is new from the news one really I will say is the huge micro mangas detector it's the first time the resistive micro Mega is built before they were small and the technology was built in purpose for Atlas and it was very challenging because it's very huge when you see it in the lab it stays in the table when you start to build and build and build it is a very his biggest like a building so yeah I don't remember what was the question but just more about the news mobile that is something yes um thank you yeah yeah there is also um a video on the channel where you can see how the newsmobile was transported here to the other detector and then lower down and installed um it took in real time um quite a couple of hours so you can watch the whole thing I believe but also a shortened version so our next question is from Baron is all the data collected shared freely across the Earth so that all can test it so um first when we take the data it's not uh quite um in this yeah immediately shared with everyone freely but we release indeed data sets that were collected after some time after we have checked that everything is fine also um openly so people can also look into this um our next question is from Tyra how is atlas attempting to study dark matter and Leo Sean you already mentioned Dark Matter earlier um yeah and this is not my research area but I can try to say something in general so dark matter is a kind of matter that they usually has very very little interaction with the normal matters um but we are in the astronomy they are detected while their gravitational effect but in the particle physics we try to study if there are any models that led them to interact with the standard model particles so that we can detect them while the interaction with the standard model particle but then this interaction should be very very small so that they don't violate our weight observation today so yeah we need to collect a lot of data so that we can detect such a small interaction our next question is from katam does it take a lot of time to analyze one terabyte of data so depends a bit like um of course the data needs to be processed first after it was collected and streamed out so this takes a couple of hours or also days it depends how much data is really processed and then for the analysis here it also depends whether there is already something in place and you're already prepared to analyze it or you want to start from scratch and this can then take several months or so then up to years until you really all of the data is analyzed and we want to analyze not just um the data from one run like we took today but while we're from all the data that we collected throughout the year or several years the entire run free to not let ourselves be fooled by any statistics fluctuations our next question is from uh sorry piano but is the type of readout chips that is used in the inner detector I don't know Sevilla is shaking her head sorry sorry we don't have an inner detector expert right now with us so maybe we need to ask finishes afterwards again that he can tell us um our next question is from yara's Love um do we detect neutrinos and if it is hard to detect neutrinos can we detect neutrinos basically neutrino Escape so what we detect is everything but neutrinons so we try to be as much aromatic as possible we need the address detector is like a barrel with the Hem cup so cover every everything and no particle could in principle Escape if we see a missing part of energy somewhere we can imply that there was uh some particle that didn't interact and one of them could have been the neutrino thanks as Sevilla our next question is from Mio and Mia asks [Music] oh no I lost the question sorry um so our next question is from kiano again is the hilumi LHC project still underway is it still underway yes yeah yes it is still underway we will have the longer shutdown Tree in 2025 starting and then now I don't have the dates in my hand until unless you have but I yes it will start a few years after and from other side we are building the upgrade detectors for the illumi LSC yes yeah those are the ones that you already mentioned the our sun right itk and high granularity timing detector yes okay our next question is from our fun is there an alternate way to lessen the huge amount of electricity consumption um so yeah that's through a certain and the accelerators and the detectors especially the accelerators consume quite a lot of energy but of course we try to also reduce this where we can um sorry um I know that for example buildings are closer to lseb experiment they use the heated water and there is a water that uh um uh serves as um cooling uh I mean there is a quarter that circulates in the experiment to cool down the electronics and this heat is sent to the houses and close to the experiment so this is how we can start to recycle energy oh this is great so it should be lesson lessening the consumption of CERN itself but it helps reduce the energy consumption and um from normal buildings where people live so this this is really great um our next question is from crypto can you use can you comment on the use of AI in Atlas an can you comment on the use of AI in Atlas um yes so AI is a very fast uh fast changing area while we had been used something like machine learning Technologies in the analysis for many years um with that we build models so that they can be trained and then they can help us to distinguish the signal from background so that's usually more efficient than we just apply some simple selection ourselves and these are the method that we have been used for many years so nowadays we are also exploring the use of the most advanced AI technology including how we can use them to better do the data analysis and also how we can make use of things like AI assistant to help us to to to do the coding software development faster and more accurate so we are following this updates and yes so yeah we constantly try to improve the way we analyze the data to make the most of the out of the data that we collect our next question is from Tyra again um what is your favorite part of working at the atlas experiment so for me my favorite part is um to work together with a lot of people from all over the world and if you get quite some nice New Perspectives and insights from everyone and also that there is a new challenge actually yeah every day so it never gets boring what is your favorite part of exactly the same feeling yes it's like I cannot add something more yes very good and for you Liao shine it's the same yes so we can work with many different people there are from different continents of the world and we learn different cultures we enjoy this uh very global environment working here and also something in particular I I really remember the exciting moment when we get the first collisions in the control room and when we see the Collision events in the event display so at that point we know everything the detector the data acquisition system the triggered and including LLC everything is working so that was really an exciting moment that I remember right so our next question is from Scott tillo um if it is a continuous beam passing through four detectors um to do those collisions affect the data in other detectors or um are those collisions filtered out afterwards so good okay so we are colliding we have four big experiments at the LHC detector and simultaneously we have collisions in all four so are there any way those collisions um affect each other in the different detectors yes so Atlas and CMS are kind of bounded together and the LCB and Alice as well so sometimes if we decided to go for a certain condition of the beam CMS need to agree and in particular if we need to have heavy ions then all the experiments need to agree because the ring is only one so we can circulate only one kind of particle but even when we are in standard physics and we have a proton collisions Atlanta and CMS they are symmetric at the opposite side of the Rings and some of the conditions need to be agreed between our two experiments and this is basically our role to according to collaborate collaborate with CMS and try to agree on on what we want to do yes I think think Sylvia also want to know whether they uh whether there's some interference I think but um yeah usually we don't we see the collisions that are happening at CMS the LHC is quite big um 27 kilometers in a circumference so yeah it's quite far away then our next question is from Anand when can we expect new discoveries it's a good question when can we expect new discoveries we also want to know predict new discoveries that's just the nature of a new discoveries that we don't really know when they will come but for sure we are hoping um that we find something new maybe even um with the data that we took today so our next question oh this is a question that is perfect for Syria Kai wants to know how does someone become one coordinator I can say my experience yeah I am in Atlas since I'm a student I was building the neon detectors and then I went in the cavern to install them and then my experience was basically in the control room since the start of the atlas operation um so yeah then uh colleagues are voted me so his uh votation uh so yeah you need to be experienced in different fields and then it depends from the colleagues what they decided to choose right I mean address is a huge collaboration and for a position like one coordinator we actually have real votes um so Syria um what's the most successful candidate it was about this one coordinator and we will you can see it's your turn now for how long yeah the position is you started with one year of deputy and then one year of coordinators and so now there is Catherine who is my deputy and last year I learned from jurga who was the actual run coordinator yeah and this year you're in charge okay our next question is from David um after the discovery of the Higgs what is the main focus now at Atlas so Liao Shan you already um told us a little bit about what are we looking for maybe you want to repeat it again or add something to it yeah um so uh yeah we just celebrated the 10 years anniversary of the Hicks Discovery and that's the one last piece of the standard model that we looking for for a long time um but then we want to know the full picture of the uh silver the the electro Electro weak symmetry braking and then that involves the shape of the hex potential for example for this one uh only discovering the Hicks does not tell us the full picture but we also need to measure the self interaction of the hex potential um so right now one Hot Topic in the atlas is searching for the daihix production yeah thanks a lot uh Liao Shan of course yeah we have also many other things we want to look for right now um we have a quite broad field of questions so we are looking trying to look in each and every direction and hopefully find something new soon so with this we are at the end of our q a session thanks a lot for everyone um who sent us questions and also for joining us on our tour through the control room in case you were a little bit late and missed the beginning and maybe with the entire tour then no problem the video will be available on YouTube so you can watch it again and yeah also thanks to all of the experts that were with us today and in particular also to Sylvia our run coordinator Anthony our event display expert so thanks everyone for tuning in and bye thank you bye [Music] foreign

Channel: CERN

Views: 6,390

Keywords: ATLAS, LHC, Particle physics

Id: IBJYewd5hIg

Length: 62min 4sec (3724 seconds)

Published: Fri May 05 2023