Status of UCSB LT Testing

1
Status of UCSB LT Testing

• All 10 slots are equipped with UTRI, PAACB and
  adapter boards.
• All 10 UTRI connected to multiplexer.
• All 10 slots have HV connections with bias
  current monitored by electrometers.
• 9 cold box plates available with adapter cards
  mounted on standoffs of correct height.
• 4 PAACBs are connected for readout of module
  temperature sensors and low voltage currents.
• Software reads out everything that is connected.
• http//hep.ucsb.edu/people/gartung/ltdata

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Module 1041
Module 1040
Module 1033
Module 1042
IV curves. Upper T23C, Lower T-15C,-18C,-20C
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Leakage current versus time (temperature).
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Module temperature sensor readings (blue,
magenta) Heat sink temp (red), carrier plate temp
(green)
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Module 1037
6
Large amount of noise occasionally seen in
system. Might be faulty backplane connection.
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Faulty backplane?

• Connections through backplane made with stacked
  wire wrap connectors.
• Pins are long and fragile and not rounded.
• Pins have been bent while connecting adapter due
  to very slight misalignment (0.02 in) of
  standoffs.
• Two HV connections through backplane are open.
  Made HV connection by using spare pin on PAACB
  and adapter board.
• Large noise in the system that can go away when
  adapter board is reseated on backplane connector.
• Rebuild backplane using PCB mounted connectors
  instead of stacked connectors.