1. CMS Muon System Guenakh Mitselmakher University of Florida
G. Mitselmakher, Split, October 2006

2. 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

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)
Endcap RPCs
Alignment (Barrel, Endcap and Link)
G. Mitselmakher, Split, October 2006

5. 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

6. 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

7. 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

8. 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

9. DT+RPC DTs and Barrel RPCs: STATUS OF INSTALLATION end in 2006SX
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

10. 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

11. Barrel MU: GOAL AND RESULTS FROM MAGNET TEST/COSMIC CHALLENGE10 11
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. 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

14. 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

15. 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

16. 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

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 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 36 chambers are waiting to be installed
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 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

26. MTCC
G. Mitselmakher, Split, October 2006

27. 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

28. 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

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 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

33. 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

34. 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

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 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

37. CMS Forward RPCs China Pakistan Gap production Korea
Front-end electronics
Pakistan
G. Mitselmakher, Split, October 2006

38. 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

39. 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

40. 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

41. 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