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AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
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Message ID: 401
Entry time: Thu Mar 3 08:45:03 2022
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| Author: |
OH, NH |
| Subject: |
AIDA Noise and grounding tests 3rd March |
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Pulser spectra
- Changes to the nn pulser circuit yesterday have improved the peak widths on the p+n side
- p+n peak widths averact around 100 channels
- n+n around 1000 at 0xa threshold
- n+n 1.8.L spectra - attachment 1
- p+n 1.8.L spectra attachment 2
p+n peak widths
| FEE |
Width |
| 9 |
105 |
| 1 |
82 |
| 10 |
71 |
| 11 |
79 |
| 3 |
96 |
| 12 |
72 |
| 13 |
191 |
| 5 |
101 |
| 14 |
129 |
| 15 |
118 |
| 7 |
110 |
| 16 |
100
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n+n peak widths
| FEE |
Width |
| 2 |
1200 |
| 4 |
1179 |
| 6 |
- |
| 8 |
1813 |
Daily checks
- Fee temperatures ok - attachment 3
- Bias and leakage currents ok - attachment 4
- Stats spectra with current grounding - attachment 5
- Current grounding is just a cable going between each adaptor board and its respective FEE
- Interfee grounding done by power supply and also pulser circuit
- Rates for each of the asics - attachment 6
- p+n waveforms - attachment 7
- n+n waveforms - attachment 8
- Lots of noise evident on them
Plans for the day
- Connect FEEs up to the copper earth bars installed
- Powercycle and check noise levels
- If n+n remains significantly higher investigate the n+n pulser circuit further
- Investigate the effects of different jumper connetions At present n+n have all LK jumpers on and p+n have lk2-4
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