Plan for MRPC Production Yongjie Sun Center of Particle Science and Technology University of Science...
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Transcript of Plan for MRPC Production Yongjie Sun Center of Particle Science and Technology University of Science...
Plan for MRPC Production
Yongjie Sun
Center of Particle Science and TechnologyUniversity of Science and Technology of China
Mar. 31, 2011 STAR MTD workshop, USTC 2
Outline
Material Module assembly
procedure Performance test Time schedule Summary and outlook
QC. & QA.
QC. & QA. QC. & QA.
Mar. 31, 2011 STAR MTD workshop, USTC 3
1. Material list
Use the same material at different sites is preferred. Otherwise, the equivalent must be proved.
Material length width thickness Notes
Inner glass 874 ±0.2 543±0.2 0.7±0.02 5 pieces
Outer glass 890±0.2 559±0.2 1.1±0.02 2 pieces
Graphite liquid electrode 882 551 ~ 4 MΩ/□
Mylar 895 564 0.15±0.01 2 pieces
PCB 915±0.2 580±0.2 0.9 ±0.05 2 pieces, 12 strips, 0.035 thick.
honeycomb 890±1 559±1 10±0.3 2 pieces
Double-side tape 890 559 0.13 2 pieces, for the honeycomb
Fishing line 0.25±0.005 6 gaps
Support block 30±0.2 18±0.2 7.5±0.05 8 pieces
HV wire By USA
signal cable By USA
Unit: mm
Mar. 31, 2011 STAR MTD workshop, USTC 4
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.
Mar. 31, 2011 STAR MTD workshop, USTC 5
2. Assembly procedure
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
Preparations
Mar. 31, 2011 STAR MTD workshop, USTC 6
Assembly procedure
adhere the honeycomb to pcb with double-side tape.
put the screws into the bottom pcb for supporting fishing line.
Mar. 31, 2011 STAR MTD workshop, USTC 7
Assembly procedure
Put the mylar on the surface of pcb. Put the outer glass (with electrode p
ainting facing outside) on the mylar.
The HV connection was made by adhesive graphite tape at two corners where Mylar has been cut out.
Mar. 31, 2011 STAR MTD workshop, USTC 8
Assembly procedure
Run the fishing line between the screws and put the inner glass on top of it.
……
Mar. 31, 2011 STAR MTD workshop, USTC 9
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” cabl
e. Protect the HV solder point with CAF4 silicon.
Mar. 31, 2011 STAR MTD workshop, USTC 10
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.
Mar. 31, 2011 STAR MTD workshop, USTC 11
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
Mar. 31, 2011 STAR MTD workshop, USTC 12
Performance standard
Noise rate: <400 Hz/strip Leak current: < 40 nA Efficiency: > 90% Time resolution: < 120 ps (for 90% chan
nels)
Mar. 31, 2011 STAR MTD workshop, USTC 13
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.
Mar. 31, 2011 STAR MTD workshop, USTC 14
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%
Mar. 31, 2011 STAR MTD workshop, USTC 15
QA. & QC. will be strictly performed during the construction.
Hope continue the success of STAR TOF.
Trouble: lack of FEE board.
5. Summary
Thank You !