ATLAS muon spectrometer varia, status, and upgrades. Gerjan Bobbink Steenwijk 16-june-2017

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1 ATLAS muon spectrometer varia, status, and upgrades Gerjan Bobbink Steenwijk 16-june-2017

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3 Muonspectrometer; large system Magnets (ECT, B-field sensors) Trigger system based on RPC, TGC chambers Precision chambers MDT s, CSC s chambers (96 BOL s) ROD based DAQ systems (MROD s) Alignment system (RASNIK) CalibraVon system ReconstrucVon sowware Gassystem, LV, HV,DCS,B-,T-sensors (Nikhef contribuvons in red)

4 Muonspectrometer maintenance/upgrades The muon spectrometer is a large device. To keep it funcvonal work is needed which is classified as maintenance, phase-0 upgrade, phase-1 upgrade, phase-2 upgrade, installavon of the staged EE chambers in LS1, etc,etc. So phase-0 upgrades are installed in LS1 2013,2014, phase-1 upgrades in LS2 2019,2020 and phase-2 upgrades in LS3 2024,2025 Most upgrades arranged around Long Shutdowns (LS), but smaller upgrades can be installed in the Xmas shutdown s New Small Wheel (NSW) is a phase-1 project to be installed in LS2 with a budget of 10M+. BIS7/8 will be replaced with BIS78(sMDT+RPC) and barrel and endcap alignment joined at that place. Phase-2 upgrade will probably imply for muons to change all electronics, new BIS smdt chambers and a BI layer of small gap RPC s for improved trigger, new power supplies, large eta tagger(?) and bring all data to USA15 where ATLAS/TDAQ takes over. IDR held, TDR being discussed/wrihen Driving arguments: keep the trigger threshold s reasonable, do not loose efficiency and resoluvon. (Remember Hàmumu discussed yesterday) Good news: MDT have very few broken wires (say 1-2/year). Not so good news: RPC have gasleaks, convnuing repairs needed at Xmas shutdowns TGC forward trigger improvement with Tile and FI. About 10 chambers replaced. Not so good news maybe CSC: issues with sparking, breaking wires and cooling

5 CSC: broken wire repairs Major EYETS Work: 2 chambers taken to the surface for repair of broken wires 2 chambers with 3 broken wires (out of 32 chambers and 128 layers in total) Visual inspection and cleaning of all 8 layers Repair and replacement of 3 layers with broken wires C01 - layers 1,4 C03 - layer 2 Bringing a CSC chamber to the surface C01 and C03 are now reinstalled and recommissioned in ATLAS Unfortunately after ramping C03 to nominal HV in ATLAS, wire in layer 2 broke again Had been tested successfully in SR1 at nominal HV Cleaning of a CSC Layer C03 layer 2 will remain broken in 2017

6 MDT: 12 new smdt BMG CHAMBERS MDT: NEW BMG CHAMBERS Tracking chambers: 6 12 new smdt Chambers installed & commissioned in Sectors inside detector feet between BMFs Increase in 3 station coverage Very smooth: installed, aligned, connected, and included in DAQ in ~1 month Successfully observed cosmics during Milestone weeks ADC & TDC consistent with cosmic muons Cosmic event display below BMG4A12 BMG 12 new BMG smdt chambers in Sectors ADC Spectrum inside detector feet between BMF cham in BMG4A12 smdt chambers TDC Spectrum drift tube diameter 15mm instead in BMG4A12 lower occupancy shorter deadtime with ADC > 80 Nikhef contribuvon: implementavon of new HPDT readout in DCS/ less gain loss due to space charge JTAG and MROD (bykarri the usual MROD Folan DiPetrillo ATLAS crew) Weekly 25 April 2017 to twice the number of layers The BMG are more noisy, leaky than MDT,upbeing adressed/solved Cutout Regions

7 Ethernet based frame frame grabber for the ATLAS rasnik barrel alignment system, about 6000 opvcal lines Replace the present 8 PCI based video digivzers that are installed in 8 windows XP PC s. This technology has become obsolete. A Linux/Ethernet based frame grabber (camera in, Ethernet out) has been designed by and we installed them Dec Basically OK. SVll some 20 opvcal lines do not work and some system fixes needed

8 Barrel-alignment rack in USA15with 4 RASVIG and 4 TOPmux as from Dec 2016

9 NSW, phase 1 upgrade TGC Module 0 done, MM module 0 done. Problems with board Deliveries. Nikhef: Felix, ROD, B-sensors

10 Phase-II upgrade projects: Summary l Replacement of electronics comply with TDAQ requirements + improve trigger logic + introduce MDT trigger => improve trigger selectivity small sector l BI upgrade: + 4 th layer of new type RPC + smdt chambers => improve trigger acceptance => robustness against reduced efficiency on old RPC l Large-η tagger => extend η coverage large sector l Options to replace TGCs in specific places to improve trigger l Replacement of Power Supplies(HV and LV) 10

11 Small-Diameter DriW Tubes for High Background Rates By reducing the drift tube diameter from 30 mm (MDT) to 15 mm (smdt) at otherwise the unchanged operating conditions and while keeping all advantages of the MDTs as well as their services: 8 x lower background occupancy (4 x shorter maximum drift time, 2 x smaller tube cross section). MDT smdt 30 mm 15 mm Electronics deadtime ( max.drift time because of afterpulses) can be reduced by a factor of 4, thus the masking of muon hits by preceeding background hits. Drift time spectrum 50% occupanc y 6.5% occupanc y n s 700 n s Also, space for twice as many tube layers within the same available detector volume, allowing for additional increase in muon tracking efficiency and resolution.

12 Status of smdt and BIS Layer Design RPC smd T 12 BMG smdt chambers installed in January Design of integrated BIS 7/8 smdt + triple thin-gap RPC chambers well advanced. Pilot project for new BIS layer. BM G BME smdt module 0 and RPC prototype in March BIS 7/

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14 Small-gap RPC detectors - Reduced thickness of gas gap (1 mm instead of 2 mm) and electrodes - High-sensitivity FE electronics allows to operate at reduced gas gain - Modular structure allows to stack detector layers in small space 2-gaps prototype 14

15 RPC : results from GIF gaps prototypes tested recently at GIF++ analysis is ongoing - Test of large 1-gap prototype at GIF++ shows very good performance and rate capability 15

16 We, Nikhef, concentrate on: MROD,electronics upgrade LS2 SWàNSW MROD sàfelix but not only. FELIX also used for example in LAR and BIS78 LS3 FELIX used in all systems

17 InsVtuVonal Commitments The spokesperson of ATLAS is requesvng Project Leaders to implement a scheme of insvtuvonal commitments to operate and maintain the ATLAS detector. For our hardware I see lihle change. We maintain it anyway per MOU and per Nikhef policy. MROD s can now cope with 3x10**34 luminosity and RASNIK DAQ has just also been modernized. My esvmates of effort for the next years Vll 2024: MROD: 0.2FTE PH; 0.2 FTE technical support (CT+ET) DCS: Bfield, Temp-sensors,JTAG 0.05FTE PH, 0.05FTE CT RASNIK: 0.1FTE PH, 0.05FTE CT BOL MDT s: 0.1FTE PH

18 Summary MDT s are in good shape. NSW MM and stgc will have to be constructed in a very rapid pace in order to install the NSW in LS2 Phase 2 upgrade starts to be well defined. IDR done, TDR nearly ready for circulavon Worry/Challenge: how to manage with less and less persons

19 BACKUP

20 RPC Gas leak repair techniques Incomplete crack complete breakdown spray glue Install new inlet 20

21 BOL sector 13

22 Cavern background MoVvaVon of NSW upgrade: 2) count rates Measured and scaled cavern background in the EI (small wheel) 1x10 34 is OK, but no margin any more at higher lumi Rate (Hz/cm 2 ) L=1x10 34 ] 2 Hit Rate [Hz/cm CSC MDT 1 ATLAS Preliminary Data (large sectors) Fit to data Fit to simulation Average luminosity " 9.6! cm -2 s -1 MDT r [cm] CSC MDT rate limit MDT 300 khz/tube 200 khz/tube Radius (cm)

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24 From our upgrade ambivons: II DCS/ RASNIK 2.2: project: DCS/RASNIK upgrades Nikhef is, together with other insvtutes, responsible for the DCS and alignment systems, a contribuvon to the upgrade of these systems is to be foreseen. For the NSW DCS and alignment systems Nikhef expervse is relevant and a modest contribuvon by Nikhef should not be excluded. In the current shutdown, the framegrabbers are replaced. In LS-2, an upgrade of PCs is likely to be needed. In LS-3, a larger upgrade to be ready for a considerable extension of the running Vme at HL-LHC seems appropriate. Technical manpower: Phase 1 effort: CT: 0.5 FTE for 2 years ( ) Phase 2 effort: CT: 1 FTE for 2 years ( ) ET: some work for phase-2, depending on details of project MT: some minor mechanical work Physicists: Gerjan Bobbink, Stan Bentvelsen Costs: 0.1 MEuro Total