Plan for MRPC Production

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Plan for MRPC Production

• Yongjie Sun
• Center of Particle Science and Technology
• University of Science and Technology of China

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Outline

• Material
• Module assembly procedure
• Performance test
• Time schedule
• Summary and outlook

? QC. QA.
? QC. QA.
? QC. QA.
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1. Material list
Unit mm
Material length width thickness Notes
Inner glass 874 0.2 5430.2 0.70.02 5 pieces
Outer glass 8900.2 5590.2 1.10.02 2 pieces
Graphite liquid electrode 882 551 4 MO/?
Mylar 895 564 0.150.01 2 pieces
PCB 9150.2 5800.2 0.9 0.05 2 pieces, 12 strips, 0.035 thick.
honeycomb 8901 5591 100.3 2 pieces
Double-side tape 890 559 0.13 2 pieces, for the honeycomb
Fishing line 0.250.005 6 gaps
Support block 300.2 180.2 7.50.05 8 pieces
HV wire By USA
signal cable By USA

• Use the same material at different sites is
  preferred.
• Otherwise, the equivalent must be proved.

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Quality control on the material

• Glass
• Measure the dimensions (spot check of 20)
• Check the surface quality
• Pcb
• Dimensions,
• the scratch on the strips
• Honeycomb
• Dimensions, surface quality
• Mylar foil thickness
• Fishing line
• Dimension check of each coil
• Support block thickness

Material with faults will be returned back to
factory.
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2. Assembly procedure
Preparations

• Material cleaning
• Glass washing by hot steam and alcohol
• Honeycomb, mylar, pcb, support block
• Electrode painting
• Protect the edge of glass with tape (4 mm)
• Applying the graphite painting
• Drying for 24 hours
• Measure the surface resistivity

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Assembly procedure

• adhere the honeycomb to pcb with double-side
  tape.

• put the screws into the bottom pcb for supporting
  fishing line.

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Assembly procedure

• Put the mylar on the surface of pcb.
• Put the outer glass (with electrode painting
  facing outside) on the mylar.

• The HV connection was made by adhesive graphite
  tape at two corners where Mylar has been cut out.

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Assembly procedure

• Run the fishing line between the screws and put
  the inner glass on top of it.

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Assembly procedure

• Put the top pcb (with honeycomb, mylar and
  another outer glass) on.
• Put iron bricks on top of the structure and press
  for more than 12 hours.
• Fix the structure with pins along the edges.
• Install the support blocks between the pcbs.
• Solder the HV wire and signal pigtail cable.
  Protect the HV solder point with CAF4 silicon.

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QA. QC. during assembly

• Check the cleanness of material during the
  assembly. Blow off the dust with pure N2 if
  needed.
• Measure the thickness between pcbs at 16 points
  along the edges. The uniformity should be less
  than 0.3 mm.
• Check the connection of HV and signal cable.

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3. Performance test

• Install the module into the gas box and flow the
  working gas for more than 48 hours.
• Training with HV for 48 hours.
• Test the leak current and noise rate.
• Take the cosmic ray data at 2 different positions
  for efficiency and time resolution test (24h for
  each position).
• Need all the modules take the cosmic ray test?
• 20 efficiency and time resolution
• Others leak current and noise rate

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Performance standard

• Noise rate lt400 Hz/strip
• Leak current lt 40 nA
• Efficiency gt 90
• Time resolution lt 120 ps (for 90 channels)

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Documents for QA. QC.

• Recording Tables for QA check and test results
• Manufacture card
• QA check Cards
• A web-based database will be available similar to
  that of STAR TOF.

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4. Time schedule

• 2011.4 2011.6 ? finalizing the design
• 2011.6 2011.11 ? 20
• 2011.11 2012.5 ? 40
• 2012.5 2012.11 ? 40

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5. Summary

• QA. QC. will be strictly performed during the
  construction.
• Hope continue the success of STAR TOF.
• Trouble lack of FEE board.

Thank You!
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