1. Chiho Wang ATLAS TRT Krakow Workshop Duke University May, 1999 1 HV Plate Design & Assembly Chiho Wang Duke University

2. Chiho Wang ATLAS TRT Krakow Workshop Duke University May, 1999 2 HV Plate Design  HV plate components: u Thin plate  Single sided circuit  Provide HV grouping for straw u Thick plate  Plan FR4 precision machined part  Determines: –Module alignment on support frame –Straw locations u Kapton sheet  Double+ sided kapton circuit  Brings HV from fuse box to straw HV group  Brings grounding to shell  Only on one side of the module.

3. Chiho Wang ATLAS TRT Krakow Workshop Duke University May, 1999 3 HV Plate Features  Thin plate: u 0.2mm thick, fits inside thick plate. u Straw hole size: 4.5mm, 0.1mm > thick plate hole size: 4.4mm  Thick plate: u Flush to shell, sets module length. u 0.25mm from support frame in Z u 0.4mm indent along radial sides for kapton sheet feed-through. u 5mm spacing from bottom to tension plate is in active gas. Capacitor barrel functions as stand off. u Cooling tube feed-through at acute corner is outside of gas volume

4. Chiho Wang ATLAS TRT Krakow Workshop Duke University May, 1999 4 HV plate feature  Kapton sheet: u Trace width = 0.3mm, thickness = 0.038mm u Trace offset when overlap = 0.35mm center-center. u Traces run equi-distant between straws. u Resistor pad is next to capacitor socket and inside straw HV group

5. Chiho Wang ATLAS TRT Krakow Workshop Duke University May, 1999 5 HV plate assembly  Glue 3 plates together u Use tra-bond 2115. Brush on think plate and kapton sheet u Use capacitor sockets for alignment u Compress and let cure  Solder capacitor sockets u Solder on thin plate side and on kapton side to complete circuit u Flow solder around socket for gas seal  Solder resistors on kapton