WEBVTT 00:00:00.000 --> 00:00:00.000 I'm sure we please 00:00:00.000 --> 00:00:07.000 Yes, I'm here. 00:00:07.000 --> 00:00:11.000 Can you see my screen? 00:00:11.000 --> 00:00:12.000 Yes. 00:00:12.000 --> 00:00:19.000 Okay. Hi, everyone. I'm Xiao Wei. So today I will give a talk on the longevity studies with full-scale CMS. 00:00:19.000 --> 00:00:26.000 Cia says, using gas mixtures with reduced cell 4 contents on behalf of the CMS muon group. 00:00:26.000 --> 00:00:38.000 So this is the slide overview. It has five parts So CMS is a general purpose detector of the LHC. From the innermost to the outermost, it has five key components. 00:00:38.000 --> 00:00:55.000 From here and the muon system is one of the important detector K component, which enabling the physics studies at cms So from the right plot, this is the RDIC resection of the quadrant of the CMS detector. 00:00:55.000 --> 00:01:02.000 So you can say different colors labeled different muon stations technology. 00:01:02.000 --> 00:01:13.000 And there are one, two, three, four. Key component for the muon detector And one of which is the castle strips chambers, which is our CSA. 00:01:13.000 --> 00:01:24.000 The CSA offers high position and good times resolution. Handle high particle rates and operate in strong magnetic field, making them ideal for the muon tracking in the forward region. 00:01:24.000 --> 00:01:41.000 And of the CMS detector. And there are four muon incap stations which label in green of 540 CSAs arranged in the ring MEIJ, which I stand for the station numbers And station one is always close to the interaction point. 00:01:41.000 --> 00:01:52.000 And just then for the ring numbers and ring y is always closest to the beam line So ME11 adapted for the higher rate in the CSA mu earn cap. 00:01:52.000 --> 00:02:02.000 And muon system can provide muon identification and momentum environment, muon trigger, rejection of the background, and power by matching the muon tracks with the inner tracker. 00:02:02.000 --> 00:02:07.000 And also play an important role in the physics study, especially in the Higgs physics study. 00:02:07.000 --> 00:02:20.000 But the CSA and RPCA contains fluorinated greenhouse gases which there have a high global warming potential respect to CO2. 00:02:20.000 --> 00:02:29.000 So… So this slide shows a CSA and reuperated CFOR system. The left plot shows the geometry of the CSA. 00:02:29.000 --> 00:02:38.000 We can say the CSA consists of six layers and operated as a standard Model Y proportional chambers with castle strip readout. 00:02:38.000 --> 00:02:45.000 And now the CSA detector operates with 40 percentage organ and 50 percentage CO2 with 10 percentage CL4. 00:02:45.000 --> 00:02:52.000 Gas mixture in the closed recirculation loop We still refreshed mixture injection. 00:02:52.000 --> 00:03:01.000 And to reduce the greenhouse gas emissions, a new CFO recuperation system was designed, built, and successfully implemented. 00:03:01.000 --> 00:03:07.000 At 0.5, Bison Gas Group. So this plot showed the recuperation system. 00:03:07.000 --> 00:03:27.000 As of 2024, the recuperation efficiency is already up to 70%. And now CMS is using 40 percentage fresh and 60 percentage recuperation Therefore, resulting in a significant reduction of CF4 usage with respect to round two. 00:03:27.000 --> 00:03:42.000 And this slide shows CSA radiation at GIF++. The Kylumia actually upgrade will significantly raise the particle background race And in saturating the studies of the CSA longevity and performance at high occupancy. 00:03:42.000 --> 00:03:52.000 Additionally, search on the further reduction of the CEN4 exhausts are developing over years resulting in special longevity studies for reduced CL4 contents. 00:03:52.000 --> 00:03:58.000 The studies are being conduct at the certain gamma Irrigation facility, which we call GIF++. 00:03:58.000 --> 00:04:07.000 With two real sassy chambers, ME11 and ME21, which is built at the CERN SPS North area in 2015. 00:04:07.000 --> 00:04:30.000 So this plot shows the Give++ operation And here is the irradiation area. We have a gold irradiator with filters located here which have 14 teraby cerium source and a gold set of filters which have an attenuation factor from 1 to 46,000. 00:04:30.000 --> 00:04:41.000 So the irradiation position here, this plot shows the irradiation position in the GIF++. In the irradiation configuration of GIF++, Me21 is positioned in front of the ME1. 00:04:41.000 --> 00:04:56.000 Closer to the sauce and during the aeration, high voltage will only apply to four of the six layers which we call the related layers And we remain two layers kept at zero voltage and we call it as reference layers. 00:04:56.000 --> 00:05:06.000 And each layer spoil the ME21 active array is also divided into three independent high voltage drones. We call it at high voltage segments, only for ME21. 00:05:06.000 --> 00:05:11.000 So these two plots shows the merit current for the irradiation layer of Me1 and Me21. 00:05:11.000 --> 00:05:23.000 And for ME11, it's approximately to 190 microamperent for ME2 and second one is about 400 microampere. 00:05:23.000 --> 00:05:35.000 So there are three period of the CSA radiation at GIF++. For period 1, we used 10% reset for gas mixture and for period 2 we used 2% cell for gas mixture and 4 period. 00:05:35.000 --> 00:05:45.000 Suri, which is ongoing. We used five percentages therefore And this table shows accumulated charge for the ME01 and ME21 for different three period. 00:05:45.000 --> 00:05:54.000 Of irradiation and the accumulated charge estimate adds enough to hilum algeironi, assuming RON3 current and background occupancies. 00:05:54.000 --> 00:06:04.000 Correct it using flu car simulation for HTCAR presence is for ME11 about 400 milligram per centimeter and for ME2 is 220 micron per centimeter. 00:06:04.000 --> 00:06:14.000 And our goal is to reach about three times the high Lumia, I should say equivalent charge to fully evaluate long-term performance 00:06:14.000 --> 00:06:19.000 And this slide shows a relevant current in the irradiation layers. 00:06:19.000 --> 00:06:32.000 And versus accumulate charge. The Redwing current can monitor the gas gun. Its definition is the irradiated layer current divided by the average current of the two reference layers. 00:06:32.000 --> 00:06:38.000 And data in the bottom two plot shows correspond to the radiation of period 3. 00:06:38.000 --> 00:06:47.000 And ME11 is the left and Me21 segment one at right shows a relative current in irradiation layers. 00:06:47.000 --> 00:06:56.000 As a function of the cumulative charge. And we can say from the plot that the layers position closer to the source will exhibit higher current. 00:06:56.000 --> 00:07:18.000 Consistent with increased exposure. And this slide shows a darker environment To decorate are showing for two types of read art, which is using only the note electronics, which we labeled as wires, and using a coincidence of wires and a note and casted signals which we labeled as words match the strips. 00:07:18.000 --> 00:07:24.000 And the top plot is the ME1 diary and the bottom plot is the ME21 decorate. 00:07:24.000 --> 00:07:35.000 I mean, we want to decorate. Was narrowed over three irradiation period So period one of the accumulate charge up to 330 mm per centimeter then. 00:07:35.000 --> 00:07:43.000 And for period two, the community chart is up to 700 and peer risk rates ongoing. 00:07:43.000 --> 00:07:53.000 For M2, we only have two periods. For period 1, it's up to three 10 milligram per centimeter and PRS rays ongoing. 00:07:53.000 --> 00:08:07.000 The difference between the decorate mirror with wires only and a wire mesh strips is due to the fact that the castle read out electronics were only installing the 80% of CSA activate area. 00:08:07.000 --> 00:08:23.000 And in the period 3, we found that there are the periodic fluctuations observed in the wire mesh strip is during that the instability of the cathed electronics. 00:08:23.000 --> 00:08:38.000 And this slide shows SAS environment with the muon test beam. In the muon test beam, we used the simulator trigger configuration. We used two different simulator triggers to define a 15 multiplied 15 centimeters squares area. 00:08:38.000 --> 00:08:46.000 And we merit special resolution as a function of the source intensity and also the efficiency as a function of the high voltage. 00:08:46.000 --> 00:09:02.000 So this is the high statistic measurement. In the in the Muon test beam configuration. The position is different compared to the Irradiation position, which Mu11 is much more closer to the source. 00:09:02.000 --> 00:09:08.000 And this slide shows a special resolution which we use Muon beam with a gamma irradiation filter scan. 00:09:08.000 --> 00:09:21.000 And the results have been corrected for the atmosphere pressure variations And we can find that a linear integration of the spatial resolution is observed with the increasing background intency. 00:09:21.000 --> 00:09:26.000 And the left plan shows 4MU and the right plot shows 4Me21. 00:09:26.000 --> 00:09:33.000 And this plot or in peer's ray. And this slide shows a special resolution versus accumulated charge. 00:09:33.000 --> 00:09:43.000 The left plot is also for ME1 and the right plot for ME21. The blue points correspond to the merriment ticking during the 10% cell for gas mixture operation. 00:09:43.000 --> 00:09:48.000 And Red Point is labeled for the five percentage for gas mixture. 00:09:48.000 --> 00:10:05.000 No significant degradation in special resolution was observed for ME11 throughout the entire radiation period up to a total accumulated charge around 700 milligrams per centimeter. There we found a slight degradation observed. 00:10:05.000 --> 00:10:13.000 But this is still under investigation. And this is the summary slide. 00:10:13.000 --> 00:10:26.000 So the CFO recuperation system developed by the CERN Gas Group has led to a significant reduction of the emission The longevity studies of the CMS, CSA, ME11, and ME21. 00:10:26.000 --> 00:10:34.000 Carried out at Give++ since 2016. And now accumulate charge for ME1 is already 9. 00:10:34.000 --> 00:11:04.000 15 millican per centimeter well for ME21 is already 867 mm Percentimeter, three gas mixtures was used in the Give++ longevity studies, which are 10 percentage true percentage and five percentage set for gas mixture And longevity studies was reduced cell four gas fraction with four sets chambers at GIF++ have accumulated about 1.5 times heilong LHC couldn't charge for ME11 and 2.4 times. 00:11:05.000 --> 00:11:12.000 Equivalent charge for ME21 and no significant degradation is seen so far. 00:11:12.000 --> 00:11:18.000 And our goal is to reach three times the high LumiHC equivalent charge to fully evaluate the long-term performance. 00:11:18.000 --> 00:11:29.000 Thank you for your attention. Any questions? 00:11:29.000 --> 00:11:46.000 Thank you. 00:11:46.000 --> 00:11:52.000 Any. And waste. 00:11:52.000 --> 00:12:00.000 So just for my curiosity and maybe it's both Jewish Greg, please go ahead. 00:12:00.000 --> 00:12:21.000 Yeah, a question on your slide five where you show the piping diagram, the circuit diagram yeah um That's the slide. The CF4 recovery box that you have there, is that a low temperature box which liquefies the CF4 out of the mixture. 00:12:21.000 --> 00:12:33.000 I'm just curious about the technology. 00:12:33.000 --> 00:12:34.000 Okay. Mm-hmm. 00:12:34.000 --> 00:12:50.000 It's like… So for the recovery system is like So here we have a gas group we have a We have a guest group and we keep night footage of the gas mixture in this gas group. 00:12:50.000 --> 00:12:51.000 Mm-hmm. 00:12:51.000 --> 00:13:04.000 And 10 percentage, we need to inject 10 percentage uh Jose, reuperated with fresh Just make sure in this case loop so uh and from so from here way come to the gas group and from the pure purifier, 90% of the gas will stay here and 00:13:04.000 --> 00:13:10.000 Then 10 percentage will come to the recovery of the C4. 00:13:10.000 --> 00:13:30.000 And then we storage the recuperated cell for and after that from the supply of the supply of of the gas we need to supply 10 percentage Oh, and there are six percentage oh sorry there are 40 percentage from here and 60 percentage from here. 00:13:30.000 --> 00:13:31.000 Like this. 00:13:31.000 --> 00:13:45.000 Okay. Okay. And I was just thinking the box at the bottom there, which has got C4F CFO recovery under it. 00:13:45.000 --> 00:13:46.000 Yes, yes. It's just, yeah. 00:13:46.000 --> 00:13:49.000 That cools the gas and liquefies it, I'm assuming, but I don' And then it's… Okay. 00:13:49.000 --> 00:13:55.000 It's some membrane used to filter the 00:13:55.000 --> 00:14:03.000 Okay. Okay. Okay. Thank you. 00:14:03.000 --> 00:14:08.000 There will also be another token recuperation system probably tomorrow afternoon. 00:14:08.000 --> 00:14:26.000 Afternoon in the later part of the day by maria christina and I think she will also be able to tell you all of the methods that are for CFO recovery. 00:14:26.000 --> 00:14:36.000 All right. So if there are no more discussions. In this session, thanks a lot again. So we take a small break of 15 minutes now and then we all yeah let's join at 11.40. 00:14:36.000 --> 00:14:56.000 C-e