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Production and Quality Control at CERN of MWPC for the LHCb Muon System. Jean-Sebastien Graulich, CERN. The LHCb Muon System Chamber Production Quality control Conclusions. LHCb Experiment. Precision B physics experiment to study CP Violation and Rare Decay

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production and quality control at cern of mwpc for the lhcb muon system
Production and Quality Control at CERN of MWPC for the LHCb Muon System

Jean-Sebastien Graulich, CERN

  • The LHCb Muon System
  • Chamber Production
  • Quality control
  • Conclusions

Jean-Sébastien Graulich

lhcb experiment
LHCb Experiment
  • Precision B physics experiment to study CP Violation and Rare Decay
    • See talk N21-8 by W. Witzeling

M1 M2 M3 M4 M5

Jean-Sébastien Graulich

muon system chambers

Chamber Dimension

Muon System Chambers
  • 4 Regions/Station
  • Mainly MWPC
    • See N1-4 for GEM
  • 20 different chamber dimensions
  • 1380 chambers

Jean-Sébastien Graulich

requirements
Requirements
  • High efficiency (>99%) in 25 ns

=> 4 gas gaps

  • Efficiency uniformity

=> Strong mechanical specifications on the gap and the wire pitch

  • High rate capability (up to 0.2 MHz/cm2) for inner chambers
  • Good ageing properties (over 10 years)

Jean-Sébastien Graulich

chamber production at cern
Chamber production at CERN
  • CERN is in charge of the production of inner chambers for Stations 2,3,4,5 (about 10 % of the total)
    • “Double Sandwich” design
    • O-ring gas tightness

Jean-Sébastien Graulich

chamber production at cern1

Production of M3R1 Wired Panels

35

Produced

30

Scheduled

25

20

Wired Panels

15

10

5

0

5/9/03

2/1/04

5/3/04

23/1/04

13/2/04

26/9/03

26/3/04

17/10/03

31/10/03

21/11/03

12/12/03

Time

Chamber production at CERN
  • Production rate of 1 ch/week achieved for M3R1 (16 ch)
  • Upgrade to 2 ch/week in progress

Jean-Sébastien Graulich

technical data

HV

HV

HV

HV

Technical data

Pitch: 2 mm

Gap: 5 mm

Wire: 30 µm,Au plated W

Gas: Ar/CO2/CF4 (40/55/5)

HV: 2550 V

Gas Gain: 5x104

Jean-Sébastien Graulich

quality control
Quality control
  • Wire fixation bars thickness (half gap)
  • Wire Pitch
  • Wire Tension (see poster N16-64 by D. Pinci)
  • Gas Leak Rate
  • Dark Current
  • Gas Gain Uniformity
  • Rest current (after High Rate g Irradiation)
  • Wire fixation bars thickness (half gap)
  • Wire Pitch
  • Wire Tension (see poster N16-64 by D. Pinci)
  • Gas Leak Rate
  • Dark Current
  • Gas Gain Uniformity
  • Rest current (after High Rate g Irradiation)

Jean-Sébastien Graulich

half gap thickness
Half gap thickness
  • Measurement: Precise gage
  • Specification
    • Min 95 % into [2.45, 2.55] mm, all points into [2.42, 2.58] mm

Jean-Sébastien Graulich

half gap thickness distribution
Half gap thickness Distribution

Jean-Sébastien Graulich

wire pitch
Wire Pitch
  • Measurement: CCD Camera
    • Precise moving table
    • Telecentric Optics
    • Simple Pattern recognition
  • Specification
    • Min 95 % into [1.95, 2.05] mm, all points into [1.90, 2.10]

Jean-Sébastien Graulich

wire pitch distribution
Wire Pitch Distribution

Jean-Sébastien Graulich

gas gain uniformity
Gas gain uniformity
  • Measurement
    • Quick test with radioactive source
      • Safety issue
      • Border effect
    • Test station
      • Use 241Am source

Jean-Sébastien Graulich

241 am peak
241Am Peak

Jean-Sébastien Graulich

delay line setup
Delay line Setup
  • Delay line and amplifiers developed by CBPF

See N16-75 by A. Barbosa

All wires connected together (Anode bar)

Jean-Sébastien Graulich

delay line output
Delay line output
  • Define time window
  • Reconstruct ADC spectrum for events in time window
  • ADC peak position normalized using a precision pulser

Jean-Sébastien Graulich

gas gain uniformity1
Gas gain uniformity
  • Specification
    • Gap averages between [0.75G0, 1.25G0],
    • Min 95% into [0.7G0, 1.3G0], all surface into [0.5G0, 1.5G0]

Jean-Sébastien Graulich

gas gain uniformity2
Gas gain uniformity

Jean-Sébastien Graulich

gas gain uniformity3
Gas gain uniformity

Jean-Sébastien Graulich

summary
Summary
  • CERN will produce 10% of the MWPC for the LHCb Muon System
  • The quality control program shows that the chambers are produced according to the specifications
  • A test station for gas gain uniformity has been developed and confirms the good quality of the chambers

Jean-Sébastien Graulich

quality control suppl
Quality control Suppl.
  • Panel Planarity
    • Done at the panel production site
    • Min 95 % of the surface within 50 mm, Maxi. deviation < 100 mm
  • Wire Tension Measurement
    • All tension higher than 50 g, Max deviation < 0.1 T0
  • Gas Tightness
    • Leak rate < 2 mbar/hour (@4 mbar Over pressure)
      • Measured with a reference volume in a thermally isolated box
  • Aging tests
    • test at ENEA Casaccia in June 2003 (0.5 C/cm have been accumulated in 1 month). No visible effect on current ratio, no Malter current observed. But cathode deposit.
    • New run is under way with reduce content of CF4

Jean-Sébastien Graulich

lear rate
Lear rate
  • Leak rate: < 2 mbar/hour (@? mbar DP)
    • Measured with a reference volume in a thermally isolated box

TCh = TRef = Constant

dV/V ~ d (DPCh-DPRef)/PCh

Absolute Error on Patm cancels out

Jean-Sébastien Graulich

lear rate1
Lear rate

Jean-Sébastien Graulich

wire tension

Same Table as for the Pitch

Scan in Frequency

12 simultaneous channels

Wire Tension

Jean-Sébastien Graulich

wire tension1
Wire Tension

Jean-Sébastien Graulich

m3r1 production flow
M3R1 Production Flow

Jean-Sébastien Graulich