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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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AIDA |
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Message ID: 534
Entry time: Thu Mar 23 10:56:29 2017
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Author: |
CG, OH |
Subject: |
Thursday 23rd March - DSSD replacement + move |
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10.00 Investigating DSSD2 (MSL BB18-1000 3058-9) missing channels, found broken bond wires on rear side (~1/4).
Replaced with 3058-3.
Stack order now:
| 3058-4
beam | 3058-3
| 2998-23
| 3058-5
| 3058-6
V 3058-7
12.00 All detectors, including the new replacement bias correctly (see att. 1).
14.00 Shunji has mentioned moving AIDA+BRIKEN forward by ~1m due to concerns about focusing the accurately at such a rearward position.
The afternoon was spent removing the EURICA rails to enable the push forward of AIDA+BRIKEN.
18.00 The DAQ was set running with the new detector included. All system checks passed apart from nnaida19 ADC calibration.
Pulser peak widths are mostly ~70-90ch for all FEEs. This is similar to Tuesday for the n-side FEEs (att. 2-4) and an improvement for the p-side FEEs (att. 5-7).
Having said that, some spectra show peaks with shoulders or tails and a few feature multiple discreet peaks.
We will look at this over the next couple of days, depending on when the final move/alignment of AIDA+BRIKEN is completed.
Complete table of pulser FWHM
nnaida# | Pulser FWHM (ch) | Comments
1 | 64 |
2 | 168 | Peak has shoulder
3 | 77 |
4 | 74 |
5 | 79 | Shoulder
6 | 86 | Shoulder
7 | 80 |
8 | 78 |
9 | 68 |
10 | 70 |
11 | 80 |
12 | 85 |
13 | 70 |
14 | 65 |
15 | 92 | Wide secondary peak in ASICs 1&4 of FWHM ~900ch @ 45k. Only few counts high (~1% height of pulser peak). Noise 10x height of pulser.
16 | 99 | Noise peak ~10x height of pulser peak.
17 | 70 | Low E tail.
18 | 75 |
19 | 96 |
20 | 83 |
21 | 68 | Additional peaks either side of pulser: approx. relative heights > (1/30) (1) (1/100)
22 | 69 |
23 | 108 | Noise peak ~10x height of pulser peak.
24 | 110 | Noise peak ~10x height of pulser peak. |
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