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


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)


Offline Muon Reconstruction Expected Performance

Muon+Tracker(“GlobalMuonReconstructor”)

Standalone Muon

CMS AN 2005/010


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)


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


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


CMS RPCs : BarrelCMS RPCs : Barrel

BW

FW

RB4 120 chambers (2 double gaps per chamber)


RB2 60 chambers (2 double gaps per chamber) + 60 chambers (3 double gaps per chamber)




RB2 60 chambers (2 double gaps per chamber) + 60 chambers (3 double gaps per chamber)


60 sectors

Double gapDouble gap


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


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


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


Barrel MU: GOAL AND RESULTS FROM MAGNET TEST/COSMIC CHALLENGE

1011

Aim Jun 04 Achieved : Aug 06


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


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)


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


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)


MTCC

Combined offline RPC (green) and

DT event

Number of clusters Cluster size


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


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


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)


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


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


CSC Production finished,all CSCs and electronics are at CERN

procurement

all panels

AssemblyME23/2

Fermilab

FAST Sitefinal assemblysystem tests

Florida


UCLA

AssemblyME2/1, 3/1, 4/1


PNPI St.Petersburg

AssemblyME1/2, 1/3


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


72 CSCs 72 CSCs

DubnaIHEP Beijing

electronics

electronics

electronics

electronics

electronics


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


432 CSCs installed

36 chambers are waiting to be installed


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


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


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)


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


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


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!


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


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


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


EMU DQM Examples: noise in cathode raw trigger hits

same channel in many planes cable connection problem

More examples of MTCC data


Off-line Analysis of MTCC data: occupancy of reconstructed hits

M. Schmidt


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.


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


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


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


• 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

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.