TO-DO for 11.04.2024
- Try bringing bPlast drain wire ground back to the PSU ground for PN 300 and R&SRMP4040.
- Recheck the downstream detector bias and ground scheme.
-
9:27 Restarted AIDA and hit go at 9:54. Situation the same as it was in the evening of 10.04.2024. 10 out of 16 FEE64s in good condition. Waveforms of aida16,
TEMP OK - HV OK. See attachments 1-6.
10:20 We grounded the output of the R&SRMP4040 to to the drain wire ground of the bPlast ribbon cables and the output of the PN 300 PSU that is powering the booster boards. Results given by attachments 7 -11. We only saw a marginal improvement in the overall noise condition.
10:32 We connected the ground of the frame to the drain wire ground, that is also mutually connected to the ground of the R&SRMP4040 output ground and PN 300 output ground. Results given by attachments ???. We did not see any improvement in the overal noise condition.
11.00 DSSSD HV OFF
FEE64 power OFF
Check seating of all adaptor PCBs and drain/ground wires secured - generally OK
Restart
1.8.W spectra - 20us FSR - attachments 15-16
per FEE64 Rate spectra - attachment 17
10/16 < 20k, max 110k
ADC data item stats - attachment 18
Incremental improvement.
11.45 DSSSD HV OFF
FEE64 power OFF
test - daisy chain removed
Restart
1.8.W spectra - 20us FSR - attachments 20-21
per FEE64 Rate spectra - attachment 19
10/16 < 20k, max 210k
ADC data item stats - attachment 22
overall somewhat worse
12.20 DSSSD HV OFF
FEE64 power OFF
Re-install test - daisy chain, Tighten aida04 DSSSD ribbon cable drain wire.
Restart
1.8.W spectra - 20us FSR - attachments 23-24
per FEE64 Rate spectra - attachment 25
ADC data item stats - attachment 26
10/16 < 20k, max 110k
Status quo ante
aida04 & aida08 1*W & 2*W spectra - 200us FSR - attachments 27-31
large transients observed for aida04 1*W - cable or ASIC fault?
aida16 **W spectra - 200us FSR - attachments 32-35
all channels apopear to be working but mix of high/low noise channels for asics #3-4, asics #1-2 all appear high noise
14.00 DSSSD HV OFF
FEE64 power OFF
Disconnect ribbon cables from aida04 adaptor PCB
Restart
n+n FEE64 1.8.W spectra - 20us FSR - attachments 37
per FEE64 Rate spectra - attachment 36
ADC data item stats - attachment 38
Implies origin of large transients observed in aida04 asic#1 is downstream of the FEE64 adaptor PCB, i.e. ribbon cable or DSSSD.
14.40 DSSSD HV OFF
FEE64 power OFF
re-connect ribbon cables from aida04 adaptor PCB
1x pin J2 slightly bent - straightended with screwdriver - FFSD connector insertion OK
Restart
n+n FEE64 1.8.W spectra - 20us FSR - attachments 40-41
per FEE64 Rate spectra - attachment 42-43
ADC data item stats - attachment 39
10x < 20k, max 120k
aida11 asic#4 1.8.W spectra - 200us FSR - attachment
no large transients observed
DSSSD #1 & #2 bias from -120V to -100V
ADC data item stats - attachment 40
9x < 20k, max 220k (aida08)
per FEE64 Rate spectra - attachment 41
17.15 bPlas ON -
Current bPlast ground configuration:
bPlas current ground configuration - drainwires of all ribbon cables excluding short side (cont. with snout) are grounded back to the bPlast R&SRMP4040 PSU, on the 29 V output. 4 V PSU to booster boards are floating, output of PN 300 is grounded to the PSU. The mesytec PSU, that also powers bPlast SiPMs at
29V is not grounded to anything but the frame. Snout is currently light tight, I suspect internal radiation from FATIMA.
It is noted that bPlast current draw fluctuated significantly (+/- 300 mV) as a result of thresholds set to the detector. I tried to set the thresholds HIGH to stabilise the bPlast detector as the power draw is fluctuating greatly.
AIDA noise very good
ADC data item stats - attachment 42
12x < 20k, max 83k (aida04)
per FEE64 Rate spectra - attachment 43
To Do list
- separate 29V (low current) and 4V (high current) return paths/ground refs
- The mesytec PSU that powers the bPlast detector is running to frame, it might be an idea to ground ribbon c
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