Plan for MRPC Production Yongjie Sun Center of Particle Science and Technology University of Science and Technology of China

Mar. 31, 2011STAR MTD workshop, USTC 2 Outline Material Module assembly procedure Performance test Time schedule Summary and outlook  QC. & QA.

Mar. 31, 2011STAR MTD workshop, USTC 3 1. Material list Use the same material at different sites is preferred. Otherwise, the equivalent must be proved. MateriallengthwidththicknessNotes Inner glass 874 ± ±0.20.7±0.025 pieces Outer glass890±0.2559±0.21.1±0.022 pieces Graphite liquid electrode ~ 4 MΩ/ □ Mylar ±0.012 pieces PCB915±0.2580± ± pieces, 12 strips, thick. honeycomb890±1559±110±0.32 pieces Double-side tape pieces, for the honeycomb Fishing line0.25± gaps Support block 30 ± ± ±0.058 pieces HV wireBy USA signal cableBy USA Unit: mm

Mar. 31, 2011STAR 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, 2011STAR 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, 2011STAR 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, 2011STAR MTD workshop, USTC 7 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.

Mar. 31, 2011STAR MTD workshop, USTC 8 Assembly procedure Run the fishing line between the screws and put the inner glass on top of it. ……

Mar. 31, 2011STAR 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 ” cable. Protect the HV solder point with CAF4 silicon.

Mar. 31, 2011STAR MTD workshop, USTC 10 QA. & QC. during assembly Check the cleanness of material during the assembly. Blow off the dust with pure N 2 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, 2011STAR MTD workshop, USTC 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, 2011STAR MTD workshop, USTC 12 Performance standard Noise rate: <400 Hz/strip Leak current: < 40 nA Efficiency: > 90% Time resolution: < 120 ps (for 90% channels)

Mar. 31, 2011STAR 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, 2011STAR MTD workshop, USTC Time schedule –  finalizing the design –  20% –  40% –  40%

Mar. 31, 2011STAR 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 ！

Mar. 31, 2011STAR MTD workshop, USTC 16