Cms muon system
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CMS Muon System. Guenakh Mitselmakher University of Florida. 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) ( 4 th RE station and η > 1.6 descoped).

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CMS Muon System

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Cms muon system

CMS Muon System

Guenakh Mitselmakher

University of Florida


Muon detectors

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)


Offline muon reconstruction expected performance

Offline Muon Reconstruction Expected Performance

Muon+Tracker

(“GlobalMuonReconstructor”)

Standalone Muon

CMS AN 2005/010


Main components of the cms muon system

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)


Cms muon system

4

3

5

2

6

1

7

12

8

11

9

10

Barrel Muon System

The Barrel Muon system:

250 chambers in 7 flavors:

60 MB1 3SL 2 RPC ~2.0 x 2.54 m2 960kg

60 MB2 3SL 2 RPC ~2.5 x 2.54 m2 1200kg

60 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 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


Cms muon system

42 mm

S

g

C

s

a

b

13mm

W

b/a ~ .65

Basic cell structure of the Drift Tubes

continuous lines represent electrodesdotted 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


Cms muon system

CMS RPCs : Barrel

60 sectors

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)

BW

FW

Double gap


Cms muon system

STATUS OF DT AND RPC PREPARATION

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………………………


Cms muon system

end

2006

UX

end

2006

SX

end

2006

beg,07

SX

in

2007

UX

INSTALLED

42 YB+1 42 YB+2 40 YB0 13 YB-1 9 YB-2

8 YB+1 8 YB+2

8 YB0 8 YB-1 8 YB-2

2 29 5

28

SX

146 35 16 28 24

DTs and Barrel RPCs: STATUS OF INSTALLATION

DT+RPC

64 chambers to be

installed in SX

40 chambers to be

installed in UX

total is 104


Cms muon system

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 16 weeks

Cabling (two teams in parallel) 5 weeks/wheel

40 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 problems

Tight schedule, but possible to finish on time for the commissioning run


Cms muon system

Aim Jun 04

Achieved : Aug 06

11

10

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


Cms muon system

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


Cms muon system

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)


Cms muon system

Dphi12

Dphi12

Dphi 12

B = 0

B 3.8T

1

2

3

Dphi 23

Dphi23

Dphi 23

Dphi 12 = deflection from 1 to 2

Dphi 23 = deflection from 2 to 3


Mtcc rbc trigger

RPC Majority: 6/6

(RBC = RPC Barrel Chambers)

MTCC…RBC trigger

  • 5/6 - trigger rate ~30 Hz per wheel

  • 6/6 - trigger rate ~13 Hz per wheel

  • DT occupancy with RPC trigger


Cms muon system

MTCC

Number of clusters

Cluster size

Combined offline RPC (green) and DT event


Cms muon system

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 layout

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


Cathode strip chambers

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)


Emu electronics system

DAQ Motherboards

Clock Control Board

C

C

B

D

M

B

T

M

B

D

M

B

T

M

B

D

M

B

T

M

B

D

M

B

T

M

B

D

M

B

T

M

B

M

P

C

T

M

B

D

M

B

T

M

B

D

M

B

T

M

B

D

M

B

T

M

B

D

M

B

Trig Motherboards

C

O

N

T

R

O

L

L

E

R

DCS

DAQ Data

Muon Trigger

TTC

1 of 5

Peripheral Crates

(on Iron Disks)

1 of 5

CFEB

CFEB

CFEB

CFEB

CFEB

Cathode Front-end Boards

1 of 2

Anode Front-end Boards

1 of 24

LV Distr. Board

ALCT

LVDB

Anode LCT Board

Cathode Strip Chambers

EMU Electronics System

DDU Boards

FED Crates (in USC55)


Cscs are capable to work in high rate background gif tests

Layer 1

Layer 2

Layer 3

Layer 4

Layer 5

Signal Amplitudes

Time

Layer 6

80 strips

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


Csc production finished all cscs and electronics are at cern

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


Installation status

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


Cms muon system

432 CSCs installed

36 chambers are waiting to be installed


Commissioning of installed cscs

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


Cms muon system

MTCC


Boards replacement on installed chambers

boards replacement on installed chambers

~1% of the boards replaced

after installation on discs

(for AFEBs much less)

Board type/total/replaced

CFEB/2124/22

LVDB/432/6

LVMB/432/7

CSC/432/4

AFEB/11448/2

ALCT /432/5


Cscs and cables replacements after installation

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


Cscs electronics summary

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

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

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

CSCs in MTCC: first results

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


Cms muon system

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)


Cms muon system

More examples of MTCC data

EMU DQM Examples: noise in cathode raw trigger hits

same channel in many planes  cable connection problem


Cms muon system

Off-line Analysis of MTCC data:

occupancy of reconstructed hits

M. Schmidt


Mtcc summary cscs

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 muon system

CMS Forward RPCs

China

Pakistan

Gap production

Korea

Front-end electronics

Pakistan


Cms muon system

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


Cms muon system

CERN 22 June 2006, CMS Plenary CMS RPC Collaboration

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.


Cms muon system

CERN 22 June 2006, CMS Plenary CMS RPC Collaboration

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


Cms muon system

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


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