ELOG DESPEC

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

DESPEC

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Entry time:

Wed Oct 30 11:51:08 2019

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12.51 - detector bias and leakage currents - detector 3 has no current
                                           - other detectors ok

13.13 - tried changing from HV3 cables to HV4 - still open circuit

- tried different permutations of moving HV-4 braid and core cables (high voltage to ground connections)

(dssd3)

(all directions defined as if looking upstream)

- core -> bottom, braid -> left     open - circuit

- core -> top, braid -> right       trips at 8V

- core -> bottom, braid -> right     open - circuit

- core -> top, braid-> left          trips at 8V

- removed jumpers - still trips

13.36 - testing continuity of bond wires on dsssd 3208-14 & 3208-15

- observe 20 ohm resistance on p+p and p+n bond wires

19:41 - dsssd 1 and 2 not biasing, 3 ok.

- changed bias configuration -> HV core 1 & 2 now on top, braid on right

- ribbon cables for DSSSD #1 & #2 p+n junction strips down were misaligned

- all detectors biased succesfully

HV cable configuration (looking upstream): HV-1 Core -> top-inner (FEE 1)
                        
                                           HV-2 Core -> top-middle (FEE 5)

HV-3 Core -> bottom-outer (FEE 11)

HV-1 Braid -> right-inner (FEE 2)

HV-2 Braid -> right-middle (FEE 6)

HV-3 Braid -> left-outer (FEE 12)

Attachment 3 - rough sketch of HV cable configuration, looking upstream.

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Attachment 1:

bias30Oct.png Original size: 503x343

Attachment 2:

30Octbias2.png Original size: 499x343

Attachment 3:

hvsketch.pdf Original size: 595x842

Attachment 4:

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