09.50 DSSSD bias +100V leakage current +9.255uA - attachment 2

      FEE64 temperatures OK - attachment 1

      All system wide checks OK

      per FEE64 1.8.W spectra 20 & 200us FSR - attachments 3-6

      per p+n FEE64 1.8.L spectra - attachments 7-8
       aida01 pulser peak width 87 ch FWHM

      adc data item stats - slow comparator 0x64, 0x14, 0xa - attachments 15, 14, 11
      per FEE64 rate spectra - attachments 9-10, 12-13


from https://elog.ph.ed.ac.uk/AIDA/872

13x FEE64s installed - see attachment 2 ( courtesy NH )

FEE64 #    Cable set #
1          1
2          2
3          3
4          4
5
6          6
7
8          8
9          9
10         5
11         11
12         7
15          

Change AIDA PSU cabling from

#1 1-3 2-4 5-6 7-8
#2 9-10 11-12 13-14 15-16

to

#1 1-3 2-4 5-7 9-11
#2 6-8 10-12 13-14 15-16

     DSSSD bias +100V leakage current +11.765uA

     per FEE64 1.8.W spectra 200us FSR - attachments 16-17

      per p+n FEE64 1.8.L spectra - attachments 18-19
       aida01 pulser peak width 158 ch FWHM ( note double peaking )

      adc data item stats - slow comparator 0x64, 0x14 - attachments 23, 21
      per FEE64 rate spectra - attachments 20, 22


     DSSSD bias +30V leakage current +35.8uA





13.35 DSSSD bias +100V leakage current +11.785uA

      aida04 34-way cable #1 connected to ASIC #1 & 2 disconnected from adaptor PCB

      per FEE64 1.8.W spectra 2000us FSR - attachments 26-27

      adc data item stats - slow comparator 0x64, 0x14 - attachments 29-30
      per FEE64 rate spectra - attachment 28


16.20 Install LK2 & LK4 aida12, aida03, aida11 ( front & rear field plate ground )

      DSSSD over current ( 200uA @ c. 30V ) - high resistance short?

      LK2 & LK4 installed aida12 *only* - OvC
      LK2 & LK4 installed aida11 *only* - OvC
      LK2 & LK4 installed aida3 *only* - OvC

      LK2 installed aida3 *only* - OvC ( LK2 = rear field plate )

      All front & rear field plate connections appear to provide a high resistance short to ground for detector bias. This may be related to issues observed biasing DSSSD via aida01 & aida09 - https://elog.ph.ed.ac.uk/AIDA/874
      But why does it affect aida12 too?