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 20 13:26:08 2021

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Turn on AIDA (SL6) to investigate noise situation and impact of new RC filters on bias input

Current setup:
- No Detectors
- Pulser in fee14, fee8 *only*, no bias connected. FEEs isolated from each other

Pulser widths::
p+n grounds connected via bias link (no connection to HV bias itself)

[TABLE border="1"]
[b]ASIC[/b]|[b]FEE14 Width[/b]|[b]FEE8 Width[/b]
|-
1.8.L|14.41|21.86
|-
2.8.L|13.02|21.87
|-
3.8.L|12.57|21.52
|-
4.8.L|13.75|23.59
[/TABLE]

Note: FEE8 is connected via SA1 inverter -> cause of worse resolution

Plug bias into outer FEEs (14 + 8 + chaint o 6)

[TABLE border="1"]
[b]ASIC[/b]|[b]FEE14 Width[/b]|[b]FEE8 Width[/b]
|-
1.8.L|14.59|24.43
|-
2.8.L|12.73|22.25
|-
3.8.L|12.76|23.06
|-
4.8.L|14.36|23.31
[/TABLE]

Long run over lunch:

[TABLE border="1"]
[b]ASIC[/b]|[b]FEE14 Width[/b]|[b]FEE8 Width[/b]
|-
1.8.L|14.47|25.52
|-
2.8.L|12.83|24.26
|-
3.8.L|12.75|24.15
|-
4.8.L|14.58|26.93
[/TABLE] 
Figures 1 & 2

Add HV filters

[TABLE border="1"]
[b]ASIC[/b]|[b]FEE14 Width[/b]|[b]FEE8 Width[/b]
|-
1.8.L|14.34|23.53
|-
2.8.L|12.67|23.82
|-
3.8.L|12.78|23.59
|-
4.8.L|13.88|25.76
[/TABLE] 
Figures 3 & 4

Small improvement maybe?

Figs 5&6 - Oscilloscope before & after HV filter added

Plans for tomorrow (21/10/21)

- Reintroduce pulser cables through all FEEs to see impact on noise (maybe improved now)
- Measure pulser noise in battery DSO (+ other sourceS?)
- Add a DSSD and see impact on noise with HV filter
- Resistance from FEE64 adapter to mechanical ground
- Check pulser on the battery powered scope (Is the signal common to the power supply)

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