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CMS Muon System Guenakh Mitselmakher University of Florida
G. Mitselmakher, Split, October 2006
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Muon detectors Barrel DTs and RPCs Endcap CSCs and RPCs
- 250 DTs coupled with RPCs - 468 CSCs in 4 stations (ME4/2 descoped) - 3 stations of Endcap RPCs (REs) ( 4th RE station and η > 1.6 descoped) G. Mitselmakher, Split, October 2006
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Offline Muon Reconstruction Expected Performance
Muon+Tracker (“GlobalMuonReconstructor”) Standalone Muon CMS AN 2005/010 G. Mitselmakher, Split, October 2006
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Main Components of the CMS Muon System
Barrel Drift Tubes (DTs) Precision measurement and trigger Barrel Resistive Plate Chambers (RPCs) Trigger Endcap Cathode Strip Chambers (CSCs) Endcap RPCs Alignment (Barrel, Endcap and Link) G. Mitselmakher, Split, October 2006
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DTs assembled at four sites: Aachen, Madrid, Padova, Torino
Barrel Muon System The Barrel Muon system: 250 chambers in 7 flavors: 1 4 2 3 5 6 7 8 9 10 11 12 60 MB1 3SL 2 RPC ~2.0 x 2.54 m kg 60 MB2 3SL 2 RPC ~2.5 x 2.54 m kg 60 MB3 3SL 1 RPC ~3.0 x 2.54 m kg 40 MB4 2SL 1 RPC ~4.2 x 2.54 m kg 10 MB1 2SL 1 RPC 10 MB2 2SL 1 RPC 10 MB3 2SL 1 RPC F SL SL Honeycomb F SL DTs assembled at four sites: Aachen, Madrid, Padova, Torino All DTs are at CERN G. Mitselmakher, Split, October 2006
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S C W g s Basic cell structure of the Drift Tubes 42 mm 13mm
continuous lines represent electrodes dotted lines represent equipotential surfaces the position of the s equipotential depends on the cell geometry ( on the strip width and on the wire radius) Vw-Vs determine the gas gain: a gain of ~ 10^5 determines the position of the s equipotential to be ~ 2.5 mm from the wire Equipotential g is almost independent of the Voltages of s and c Vc ( and Vs) generate in the region between c and g ( and between g and s ) an electric field between 1 and 2 KV/cm to saturate the drift velocity G. Mitselmakher, Split, October 2006
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CMS RPCs : Barrel Double gap BW FW 60 sectors
RB chambers (2 double gaps per chamber) RB chambers (2 double gaps per chamber) RB2 60 chambers (2 double gaps per chamber) + 60 chambers (3 double gaps per chamber) RB chambers (2 double gaps per chamber) BW FW Double gap G. Mitselmakher, Split, October 2006
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STATUS OF DT AND RPC PREPARATION
All DT ( spare) are at CERN All the Minicrates (250) are at CERN 104 to be installed in 2006/2007 97 DT are certified 7 under certification 77 DT are certified (2 months under HV + cosmic run) and equipped with MCrate 20 DT are certified and to be equipped with MC 24 RPC out of the 208 to be installed are missing (at CERN by November to be coupled to 12 DT) 26 DT are already coupled to 52 RPC and ready on the transport frames (the max affordable is 34, in October) BMU ARE READY FOR INSTALLATION……………………… G. Mitselmakher, Split, October 2006
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DT+RPC DTs and Barrel RPCs: STATUS OF INSTALLATION end in 2006
SX 8 YB YB YB-2 42 YB YB YB YB YB-2 28 8 YB YB+2 end 2006 UX beg,07 in 2007 INSTALLED DT+RPC 64 chambers to be installed in SX 40 chambers to be installed in UX total is 104 G. Mitselmakher, Split, October 2006
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DTs: INSTALLATION AND COMMISSIONING TIME
EXPERIENCE on surface: Installation of 32 chambers ~ 2 weeks Service connect.+ commissioning ~ 6 weeks ( two teams in parallel) The rate for Install.+commiss ~ 4 chambers /week EXPECTATION: 64 DT+RPC install.+commissioning on surface weeks Cabling (two teams in parallel) weeks/wheel 40 chambers in UX ( lower rate) weeks The total is 8 working Months start November 2006, end June 2007 Continuous work, assuming no interference or problems Tight schedule, but possible to finish on time for the commissioning run G. Mitselmakher, Split, October 2006
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Barrel MU: GOAL AND RESULTS FROM MAGNET TEST/COSMIC CHALLENGE
10 11 Aim Jun 04 Achieved : Aug 06 G. Mitselmakher, Split, October 2006
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Barrel Detectors and Alignment: first conclusions from MTCC
1) The DT trigger has shown to be highly versatile and configurable, exploiting a wide range of rates DT + BRPC generated more than 10M events with magnet on and of in 5 days from Aug 24 to 28th. 2) The trigger has proven to be very clean ,Synchronization is easy. 3) First analysis confirms that RPC are unaffected by B-Field. No problem with DTs, even in the areas sensitive to B in the highest Field region (MB1/2). 4) The Alignment was able to measure the bending of YE+1 (value as expected) and the relative displacement of the Tracker versus MU G. Mitselmakher, Split, October 2006
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R/PHI position of chambers with respect to the nominal
Mu Ali. Meas. the distance between Tracker and Link disk on YE+1 R/PHI position of chambers with respect to the nominal as measured by tracks and photogrammetry. Data from PG provide an excellent starting point! Nose moves in by 16 mm TRACKS SURVEY Outer rim moves out by 6 mm (a top/bottom asymmetry is observed) G. Mitselmakher, Split, October 2006
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B 3.8T Dphi12 Dphi12 Dphi 12 B = 0 1 2 3 Dphi 23 Dphi23 Dphi 23
Dphi 12 = deflection from 1 to 2 Dphi 23 = deflection from 2 to 3 G. Mitselmakher, Split, October 2006
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MTCC…RBC trigger 5/6 - trigger rate ~30 Hz per wheel
(RBC = RPC Barrel Chambers) RPC Majority: 6/6 5/6 - trigger rate ~30 Hz per wheel 6/6 - trigger rate ~13 Hz per wheel DT occupancy with RPC trigger G. Mitselmakher, Split, October 2006
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Combined offline RPC (green) and DT event
MTCC Number of clusters Cluster size Combined offline RPC (green) and DT event G. Mitselmakher, Split, October 2006
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MTCC. Barrel Muons: SUMMARY AND PERSPECTIVES
DT and RPC Triggers are coherent, stable and precise The effect of B Field on DT is as expected The first test of Alignment system looks positive Position of the chambers from Tracks are in excellent agreement with photogrammetry Cosmic tracks and Alignment system will allow DTs to be well prealigned in time and space in the cavern before the Pilot Run G. Mitselmakher, Split, October 2006
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Endcap Muons: CSC Layout
468 CSCs, not counting ME4/2 144 Large CSCs (3.4x1.5 m2): 72 ME2/2 chambers 72 ME3/2 chambers Small CSCs (1.8x1.1 m2): 72 ME1/2 chambers 72 ME1/3 chambers 72 ME1/1 chambers 20o CSCs (1.9x1.5 m2): 36 ME2/1 chambers 36 ME3/1 chambers 36 ME4/1 chambers Frontend Electronics: 170K Cathode channels 140K Anode channels Trigger&DAQ (on-chamber part) Alignment&Services G. Mitselmakher, Split, October 2006
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Cathode Strip Chambers
468 CSCs of 7 different types/sizes > 2,000,000 wires (50 mm) 6,000 m2 sensitive area 1 kHz/cm2 rates 2 mm and 4 ns resolution/CSC (L1-trigger) ~100 m resolution/CSC (offline) G. Mitselmakher, Split, October 2006
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EMU Electronics System
1 of 5 Peripheral Crates (on Iron Disks) M P C D B T O N R L E DCS TTC Muon Trigger Trig Motherboards DAQ Motherboards Clock Control Board DDU Boards DAQ Data FED Crates (in USC55) CFEB ALCT 1 of 24 1 of 2 LVDB LV Distr. Board Anode Front-end Boards Cathode Front-end Boards Anode LCT Board Cathode Strip Chambers G. Mitselmakher, Split, October 2006
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CSCs are capable to work in high rate background: GIF tests
Layer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6 80 strips Time Signal Amplitudes Each layer has 80 strips Induced signals are sampled every 50 ns on each strip Muon is detected as a pattern of lined up hits in 6 layers Custom-designed electronics is capable of recognizing a muon track with 1 mm precision in less than 1 s—new development, allows triggering at LHC in the presence of severe background G. Mitselmakher, Split, October 2006
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CSC Production finished, all CSCs and electronics are at CERN
PNPI St.Petersburg Assembly ME2/1, 3/1, 4/1 FAST Site final assembly system tests CSC parts, critical tooling electronics 108 CSCs 108 CSCs Florida electronics FAST Site final assembly system tests 468 CSCs CERN Fermilab ISR Site pre-installation tests, storage SX5 Site installation commissioning procurement Assembly ME23/2 Assembled CSCs 72 CSCs all panels UCLA FAST Site final assembly system tests 396 CSCs 144 CSCs electronics electronics 72 CSCs IHEP Beijing Dubna Assembly ME1/1 FAST Site final assembly system tests CSC parts, critical tooling Assembly ME1/2, 1/3 FAST Site final assembly system tests electronics 72 CSCs 72 CSCs 144 CSCs 144 CSCs G. Mitselmakher, Split, October 2006
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Installation status YE2 disks YE3 disks YE1 disks
All CSCs installed per station YE3 disks All CSCs installed per station YE1 disks All CSCs on YE+1 installed ME-1/1 and ME-1/2 installed -- 72 Only ME-1/3 CSCs not installed -- 36 Installation will take one week 36 RE-1/3 must be installed first G. Mitselmakher, Split, October 2006
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36 chambers are waiting to be installed
432 CSCs installed 36 chambers are waiting to be installed G. Mitselmakher, Split, October 2006
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Commissioning of installed CSCs
Use the same equipment and software (FAST-DAQ) as in production FAST sites CSC commissioning closely follows installation 432 CSCs installed, all commissioned Frequent retests Takes care of infant mortality Long term stability Most of the problems are minor and fixed by commissioning team G. Mitselmakher, Split, October 2006
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MTCC G. Mitselmakher, Split, October 2006
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boards replacement on installed chambers
~1% of the boards replaced after installation on discs (for AFEBs much less) Board type/total/replaced LVDB/432/6 LVMB/432/7 CFEB/2124/22 CSC/432/4 AFEB/11448/2 ALCT /432/5 G. Mitselmakher, Split, October 2006
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CSCs and cables: replacements after installation
Still no broken wires in CSCs! (Out of 2mln) 4 CSCs replaced after installation(~1%): two chambers couldn’t hold HV > 2.7 kV two chambers had unacceptable level of noise 9 cables replaced: one DMB-LVDB was damaged eight skew clear cables G. Mitselmakher, Split, October 2006
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CSCs: Electronics Summary
All custom electronics production, including HV, completed All on-chamber electronics installed and commissioned Peripheral Crates Electronics Installation and commissioning of crates with electronics on schedule to be finished before lowering FED Crate Electronics Production finished Will commission crates in USC55 early 2007 Low Voltage Supply System Maraton air-cooled low voltage supplies have been chosen and ordered. Successfully tested at MTCC G. Mitselmakher, Split, October 2006
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Installation/commissioning Goals
Heavy lowering After magnet test lower all disks, rings down 100 m shaft Must remove lower peripheral crates and upper manifolds for the lowering fixture YE1 is 1400 tons, so lowering fixture is large and heavy Sequence is YE+3, YE+2, YE+1, then the barrel rings and the finally -endcap Expect lowering to begin around Nov ’06, one week per disc Mini-cable chains Carry cables and pipes between disks Recover Replace peripheral crates & manifolds Install final optical fibers Test everything again! G. Mitselmakher, Split, October 2006
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Pre-MTCC: CSC SliceTest
Many months of running with Cosmic rays at SX5 before MTCC, CSC system tests, first interface with other CMS subsystems Scale up the system from 3 to 36 CSCs From one to three stations From one to four peripheral crates etc.etc. Replace pre-production electronics with final versions user feedback regarding firmware Set up internal synchronization Verify interfacing with … Global DAQ Final trigger and control (TCC) electronics provide and receive MTCC trigger Trigger throttling hardware Central Slow Control Global Runcontrol G. Mitselmakher, Split, October 2006
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MTCC Phase #1 CSCs in MTCC: first results
Some observations on data taking and trigger: Readout (Global DAQ) and trigger went smoothly. Large data set available in which CSC participated in the global trigger cocktail and subdetector readout Large data sample (>10M events), various analyses underway Too many results to list in this short talk Data still being analyzed G. Mitselmakher, Split, October 2006
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CSC Data as seen by DQM EMU DQM Examples: Anode Trigger Primitives
Trapezoidal chamber with wire groups getting wider from narrow to wide end Mostly 6/6 patterns Two gaps—HV segmentation Tunnel and collision muon patterns (both allowed in this run) G. Mitselmakher, Split, October 2006
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More examples of MTCC data
EMU DQM Examples: noise in cathode raw trigger hits same channel in many planes cable connection problem G. Mitselmakher, Split, October 2006
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Off-line Analysis of MTCC data: occupancy of reconstructed hits
M. Schmidt G. Mitselmakher, Split, October 2006
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MTCC Summary: CSCs Pre-MTCC SliceTest was very useful MTCC:
well prepared for MTCC MTCC: A substantial set of CSC data was collected: >10M events Various CSC subsystems and Trigger performed well Offline analyses provided excellent feedback, and still do! Synchronization of the CSC chambers is a complicated task. major activity during Phase #1 Many procedures and tools were identified and developed, more work needs to be done CSC Timing task force created “Cosmics Shutdown” allows us to address any issues that were found during Phase #1 CSC focus for Phase #2 should be stable running and collecting large data sets for various trigger, efficiency and alignment studies. G. Mitselmakher, Split, October 2006
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CMS Forward RPCs China Pakistan Gap production Korea
Front-end electronics Pakistan G. Mitselmakher, Split, October 2006
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RE project Scheme: The revised initial RE system tuned to available fundining Gap production in Korea Mechanics (assembly kits) from Peking University RE1 assembly at CERN by Peking University RE2,3 assembly and testing in Pakistan Oiling facility operational in Korea G. Mitselmakher, Split, October 2006
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Endcap RPCs. Station +1 RE1
YE+1 yoke equipped with CSC/RPC packages (inner ring) and RE1/3 RPC’s (outer ring). The ME1/3 CSC’s now cover the RPC outer ring and hence complete the first muon station on YE+1. CERN 22 June 2006, CMS Plenary CMS RPC Collaboration G. Mitselmakher, Split, October 2006
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Chambers built and tested with cosmics in Pakistan
Endcap RPCs. Station +2 Chambers built and tested with cosmics in Pakistan Precommissioned at CERN 9 RPCs participated in MTCC, results being analized, valuable experience gained CERN 22 June 2006, CMS Plenary CMS RPC Collaboration G. Mitselmakher, Split, October 2006
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Muon Project : conclusions
Installation and Commissioning of the CMS Muon System is well advanced. MTCC provided a valuable system integration experience Muon system will be ready for the underground installation and for commissioning run in 2007 G. Mitselmakher, Split, October 2006
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