G. Mitselmakher, Split, October 20061 CMS Muon System Guenakh Mitselmakher University of Florida.
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Transcript of G. Mitselmakher, Split, October 20061 CMS Muon System Guenakh Mitselmakher University of Florida.
G. Mitselmakher, Split, October 2006 1
CMS Muon System
Guenakh MitselmakherUniversity of Florida
G. Mitselmakher, Split, October 2006 2
Muon detectors
Barrel DTs and RPCsEndcap 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 3
Offline Muon Reconstruction Expected Performance
Muon+Tracker(“GlobalMuonReconstructor”)
Standalone Muon
CMS AN 2005/010
G. Mitselmakher, Split, October 2006 4
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)– Precision measurement and trigger
• Endcap RPCs– Trigger
• Alignment (Barrel, Endcap and Link)
G. Mitselmakher, Split, October 2006 5
Barrel Muon System
1
4
2
356
7
89 10 11
12
The Barrel Muon system:250 chambers in 7 flavors:
60 MB1 3SL 2 RPC ~2.0 x 2.54 m2 960kg60 MB2 3SL 2 RPC ~2.5 x 2.54 m2 1200kg60 MB3 3SL 1 RPC ~3.0 x 2.54 m2 1300kg
40 MB4 2SL 1 RPC ~4.2 x 2.54 m2 1800kg
10 MB1 2SL 1 RPC 10 MB2 2SL 1 RPC10 MB3 2SL 1 RPC
SL
SL
SLHoneycomb
DTs assembled at four sites:Aachen, Madrid, Padova, TorinoAll DTs are at CERN
G. Mitselmakher, Split, October 2006 6
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
continuous lines represent electrodes dotted lines represent equipotential surfaces
SgC
Ws
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
a b
b/a ~ .65
42 mm
13mm
Basic cell structure of the Drift Tubes
G. Mitselmakher, Split, October 2006 7
CMS RPCs : BarrelCMS RPCs : Barrel
BW
FW
RB4 120 chambers (2 double gaps per chamber)
RB3 120 chambers (2 double gaps per chamber)
RB2 60 chambers (2 double gaps per chamber) + 60 chambers (3 double gaps per chamber)
RB1 120 chambers (2 double gaps per chamber)
RB4 120 chambers (2 double gaps per chamber)
RB3 120 chambers (2 double gaps per chamber)
RB2 60 chambers (2 double gaps per chamber) + 60 chambers (3 double gaps per chamber)
RB1 120 chambers (2 double gaps per chamber)
60 sectors
Double gapDouble gap
G. Mitselmakher, Split, October 2006 8
All DT (250 + 12 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………………………
STATUS OF DT AND RPC PREPARATION
G. Mitselmakher, Split, October 2006 9
64 chambers to be installed in SX 40 chambers to be installed in UX total is 104
SX
8 YB0 8 YB-1 8 YB-2
42 YB+1 42 YB+2 40 YB0 13 YB-1 9 YB-2
2 29 5
28
8 YB+1 8 YB+2
end 2006SX
end 2006UX
end2006beg,07SX
in 2007UX
INSTALLED
146 35 16 28 24
DTs and Barrel RPCs: STATUS OF INSTALLATION
DT+RPC
G. Mitselmakher, Split, October 2006 10
EXPERIENCE on surface:
Installation of 32 chambers ~ 2 weeksService connect.+ commissioning ~ 6 weeks ( two teams in parallel)The rate for Install.+commiss. ~ 4 chambers /week
EXPECTATION:64 DT+RPC install.+commissioning on surface 16 weeks Cabling (two teams in parallel) 5 weeks/wheel40 chambers in UX ( lower rate) 12 weeks
The total is 8 working Months start November 2006, end June 2007
Continuous work, assuming no interference or problemsTight schedule, but possible to finish on time for the commissioning run
DTs: INSTALLATION AND COMMISSIONING TIME
G. Mitselmakher, Split, October 2006 11
Barrel MU: GOAL AND RESULTS FROM MAGNET TEST/COSMIC CHALLENGE
1011
Aim Jun 04 Achieved : Aug 06
G. Mitselmakher, Split, October 2006 12
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 13
Mu Ali. Meas. the distance betweenTracker and Link disk on YE+1
Nose moves in by 16 mm
Outer rim moves out by 6 mm(a top/bottom asymmetry is observed)
TRACKS
SURVEY
R/PHI position of chamberswith respect to the nominal as measured by tracksand photogrammetry. Data from PG provide anexcellent starting point!
ME+1 Station (Z1 sensors)
y = 0.0307x2 + 0.0309x - 0.0007
y = 0.2806x2 + 0.1414x - 0.0081
y = 0.2646x2 - 0.1985x + 0.0057
0
1
2
3
4
5
6
7
0 1 2 3 4 5Magnetic field, Tesla
Dis
plac
emen
t, m
m,
Point 2
Point 5
Point 6
Poly.(Point 2)Poly.(Point 5)Poly.(Point 6)
G. Mitselmakher, Split, October 2006 14
B 3.8T
Dphi 23
Dphi12 Dphi12
Dphi23
B = 0
1
2
3
Dphi 12 = deflection from 1 to 2Dphi 23 = deflection from 2 to 3
Dphi 12
Dphi 23
G. Mitselmakher, Split, October 2006 15
MTCC…RBC trigger
5/6 - trigger rate ~30 Hz per wheel6/6 - trigger rate ~13 Hz per wheelW1/S10 RB1in
0,00
2,00
4,00
6,00
8,00
10,00
12,00
14,00
16,00
8,4 8,6 8,8 9 9,2 9,4 9,6 9,8
HV(kV)
Tri
g R
ate
(H
z)
RPC Majority: 6/6
DT occupancy with RPC trigger
(RBC = RPC Barrel Chambers)
G. Mitselmakher, Split, October 2006 16
MTCC
Combined offline RPC (green) and
DT event
Number of clusters Cluster size
G. Mitselmakher, Split, October 2006 17
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 18
Endcap Muons: CSC Layout468 CSCs, not counting ME4/2
•144 Large CSCs (3.4x1.5 m2):72 ME2/2 chambers72 ME3/2 chambers•Small CSCs (1.8x1.1 m2):72 ME1/2 chambers 72 ME1/3 chambers72 ME1/1 chambers•20o CSCs (1.9x1.5 m2):36 ME2/1 chambers36 ME3/1 chambers36 ME4/1 chambers•Frontend Electronics:•170K Cathode channels 140K Anode channels•Trigger&DAQ (on-chamber part) •Alignment&Services
G. Mitselmakher, Split, October 2006 19
Cathode Strip Chambers• 468 CSCs of 7 different types/sizes• > 2,000,000 wires (50 m)• 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 20
EMU Electronics System
FED Crates (in USC55)
DDU Boards
DAQ Data
CFEBCFEBCFEB CFEB
ALCT1 of 24
CFEB
1 of 2
LVDBLV Distr. Board
Anode Front-end Boards
Cathode Front-end Boards
Anode LCT Board
Cathode Strip Chambers
1 of 5
1 of 5Peripheral Crates
(on Iron Disks)
MPC
DMB
TMB
DMB
TMB
DMB
TMB
DMB
TMB
DMB
TMB
DMB
TMB
DMB
TMB
DMB
TMB
DMB
TMB
CCBC
ONTROLLER
DCS
TTC
Muon Trigger
Trig Motherboards
DAQ Motherboards Clock Control Board
G. Mitselmakher, Split, October 2006 21
CSCs are capable to work in high rate background: GIF tests
• 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
• 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
Layer 1
Layer 2
Layer 3
Layer 4
Layer 5
Layer 6
80 strips
Time
Sig
nal
Am
pli
tud
es
G. Mitselmakher, Split, October 2006 22
CSC Production finished,all CSCs and electronics are at CERN
procurement
all panels
AssemblyME23/2
Fermilab
FAST Sitefinal assemblysystem tests
Florida
FAST Sitefinal assemblysystem tests
UCLA
AssemblyME2/1, 3/1, 4/1
FAST Sitefinal assemblysystem tests
PNPI St.Petersburg
AssemblyME1/2, 1/3
FAST Sitefinal assemblysystem tests
SX5 Siteinstallation
commissioning
CERN
ISR Sitepre-installationtests, storage
144 CSCs396 CSCs
72 CSCs
72 CSCs
108 CSCs 108 CSCs
144 CSCs 144 CSCs
468 CSCs
CSC parts, critical tooling
CSC parts, critical tooling
Assembled CSCs
AssemblyME1/1
FAST Sitefinal assemblysystem tests
72 CSCs 72 CSCs
DubnaIHEP Beijing
electronics
electronics
electronics
electronics
electronics
G. Mitselmakher, Split, October 2006 23
Installation status• YE2 disks
– All CSCs installed -- 54 per station
• YE3 disks• All CSCs installed -- 18 per station
• YE1 disks– All CSCs on YE+1 installed -- 108 – 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 24
432 CSCs installed
36 chambers are waiting to be installed
G. Mitselmakher, Split, October 2006 25
Commissioning of installed CSCs•Use the same equipment and software (FAST-DAQ) as in production FAST sites•CSC commissioning closely follows installation432 CSCs installed, all commissioned•Frequent retests•Takes care of infant mortalityLong term stability •Most of the problems are minor and fixed by commissioning team
G. Mitselmakher, Split, October 2006 26
Time diagram of CSC installation and commissioning
0
100
200
300
400
Time
Num
ber o
f cha
mbe
rs Installed
Cabled
Commissioned
With problems
MTCC
G. Mitselmakher, Split, October 2006 27
boards replacement on installed chambers
LVDB/432/6 CFEB/2124/22
AFEB/11448/2ALCT /432/5
Board type/total/replaced
LVMB/432/7
CSC/432/4
~1% of the boards replaced after installation on discs (for AFEBs much less)
G. Mitselmakher, Split, October 2006 28
CSCs and cables: replacements after installation
• Still no broken wires in CSCs! (Out of 2mln)
• 4 CSCs replaced after installation(~1%):
a. two chambers couldn’t hold HV > 2.7 kVb. two chambers had unacceptable level of noise
• 9 cables replaced: a. one DMB-LVDB was damaged b. eight skew clear cables
G. Mitselmakher, Split, October 2006 29
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 30
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 31
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 32
MTCC Phase #1
• 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
CSCs in MTCC: first results
G. Mitselmakher, Split, October 2006 33
EMU DQM Examples: Anode Trigger Primitives
Trapezoidal chamber with wire groups getting widerfrom narrow to wide end
Two gaps—HV segmentation
Tunnel and collision muon patterns (both allowed in this run)
Mostly 6/6 patterns
CSC Data as seen by DQM
G. Mitselmakher, Split, October 2006 34
EMU DQM Examples: noise in cathode raw trigger hits
same channel in many planes cable connection problem
More examples of MTCC data
G. Mitselmakher, Split, October 2006 35
Off-line Analysis of MTCC data: occupancy of reconstructed hits
M. Schmidt
G. Mitselmakher, Split, October 2006 36
MTCC Summary: CSCs• Pre-MTCC SliceTest was very useful
– 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 37
CMS Forward RPCsCMS Forward RPCs
RE1/1
RE1/2
RE1/3
RE2/1
RE2/2
RE2/3
RE3/1
RE3/2
RE3/3
RE4/1
RE4/2
RE4/3
No. of chambers 36*2 36*2 36*2 18*2 36*2 36*2 18*2 36*2 36*2 18*2 36*2 36*2
ChinaChina
PakistanPakistan
Gap production
Korea
Gap production
Korea
Front-end electronics
Pakistan
Front-end electronics
Pakistan
G. Mitselmakher, Split, October 2006 38
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
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
RE projectRE project
Oiling facility
operational in Korea
Oiling facility
operational in Korea
G. Mitselmakher, Split, October 2006 39
Endcap RPCs. Station +1Endcap RPCs. Station +1 RE1
CERN 22 June 2006, CMS Plenary CMS RPC Collaboration
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.
G. Mitselmakher, Split, October 2006 40CERN 22 June 2006, CMS Plenary CMS RPC Collaboration
• Chambers built and tested with cosmics in Pakistan
• Precommissioned at CERN• 9 RPCs participated in MTCC, results being
analized, valuable experience gained
Endcap RPCs. Station +2Endcap RPCs. Station +2
G. Mitselmakher, Split, October 2006 41
• 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
Muon Project : conclusions