Transcript HV Plate Design & Assembly - Duke Atlas

HV Plate
Design & Assembly
Chiho Wang
Duke University
1
Chiho Wang
Duke University
ATLAS TRT Krakow Workshop
May, 1999
HV Plate Design
 HV plate components:


Thin plate
 Single sided circuit
 Provide HV grouping for straw
Thick plate
 Plan FR4 precision machined part
 Determines:
– Module alignment on support frame
– Straw locations

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.
2
Chiho Wang
Duke University
ATLAS TRT Krakow Workshop
May, 1999
HV Plate Features
 Thin plate:


0.2mm thick, fits inside thick plate.
Straw hole size: 4.5mm, 0.1mm >
thick plate hole size: 4.4mm
 Thick plate:





Flush to shell, sets module length.
0.25mm from support frame in Z
0.4mm indent along radial sides for
kapton sheet feed-through.
5mm spacing from bottom to tension
plate is in active gas. Capacitor
barrel functions as stand off.
Cooling tube feed-through at acute
corner is outside of gas volume
3
Chiho Wang
Duke University
ATLAS TRT Krakow Workshop
May, 1999
HV plate feature
 Kapton sheet:




Trace width = 0.3mm,
thickness = 0.038mm
Trace offset when overlap = 0.35mm
center-center.
Traces run equi-distant between
straws.
Resistor pad is next to capacitor
socket and inside straw HV group
4
Chiho Wang
Duke University
ATLAS TRT Krakow Workshop
May, 1999
HV plate assembly
 Glue 3 plates together



Use tra-bond 2115. Brush on think
plate and kapton sheet
Use capacitor sockets for alignment
Compress and let cure
 Solder capacitor sockets


Solder on thin plate side and on
kapton side to complete circuit
Flow solder around socket for gas
seal
 Solder resistors on kapton
5
Chiho Wang
Duke University
ATLAS TRT Krakow Workshop
May, 1999