ELOG AIDA

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

AIDA

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Entry time:

Sun May 29 14:06:31 2016

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Throughout day:
      DSSD2 (3058-25) would not bias, either short circuit or suspiciously low leakage current.
      Carried out some test in situ which were inconclusive.
      Removed snout and took DSSD2 out.
      Measuring the resistance across the two pins providing the n+n bias yielded 20 Ohms.
      For the p+n the same measurement saw an open circuit => at least one of the bond wires broken.

DSSD1 (3131-9) was moved into the DSSD2 position and DSSD1 is now BB18-1000 3058-4.

All detectors were biased downstairs and all looked fine - leakage currents of 3.1 - 3.8 uA.

First detector sits 54.5cm from Al base plate and 10cm from the upstream end of the snout.
      9mm between each of the DSSDs.

Stack now:
           |   3058-4
        b  |   3131-9
        e  |   2998-23
        a  |   3058-5
        m  |   3058-6
           V   3058-7

207Bi source installed at end of snout.

Snout moved upstairs and mounted.
      DSSD2 would not bias. This was due to the HV cable providing bias for this DSSD having a short to ground.
      Replaced with HV cable 7 and biased successfully.
      All DSSDs now bias. Screenshots of leakage currents attached (attachments 4+5) at room temp 25.3oC.
      Caen module Addr 00 provides bias to DSSDs 1, 2, 3 and 4 via channels 0, 1, 2 and 3 respectively.
      Module Addr 01 provides bias to DSSDs 5 and 6 on channels 0 and 1, respectively.
 
      Snout pushed in to EURICA.

22.05 nnaida17 ASIC parameters not loading
      power cycle & reboot

nnaida5 (master) clock not locked - status 0x6 - see attachments 1-3

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Attachment 1: