| ID |
Date |
Author |
Subject |
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7
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Thu Feb 12 12:18:16 2026 |
CLW | paper |
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| Attachment 1: Hanselman-2024-Improved-modeling-of-neutron-induce.pdf
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17
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Mon Mar 2 10:38:42 2026 |
CLW | detector voltage change before Run 55 |
preamp B detector (DSSSD 2) on 100 V, DSSSD 1 still on 70 |
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2
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Thu Jan 29 16:16:46 2026 |
Francisco García Infantes | SetUp Status |
Here is a brief status update on the chamber setup.
At the moment, we have all the main components required for the experiment related to the chamber:
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Vacuum chamber
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2 × MSL type W DSSSDs
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2 × MSL type W1 preamplifier units
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Sample support, feedthrough, and short cables
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4 fans for the preamplifiers
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2 cases for the preamplifiers
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Samples: 2 NaCl, 1 Boron, 1 Lithium, 1 dummy, and 1 empty
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Bias voltage cables for the preamplifiers
Please find attached some photos showing the current setup.
The only remaining item to be installed is the fans, which will be connected on Monday, February 2nd. We may also try installing the detectors soon; we have already tested the fit with a spare detector, and it fits well.
Additionally, the distance from the center still needs to be measured so that we can precisely determine the sample position from outside the chamber. We will need to add a reference mark for this.
Finally, if we decide to position the detectors further away from the beam, we will require longer bias voltage cables for the preamplifiers.
Please let me know if you need any further information.
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| Attachment 1: Preamp_Modules.jpeg
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| Attachment 2: Chamber_In.jpeg
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| Attachment 3: From_Chamber.jpeg
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| Attachment 4: Voltage_Cable.jpeg
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19
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Mon Mar 2 11:11:18 2026 |
FGI, TD, SB, CLW | Second configuration. |
After the first weekend, we change the setup configuration. We removed the shadow cone, and we placed the chamber closer to the LiF target.
The voltage was increased upto 100V for both detectors, but there was a problem in DSSSD1. Therefore, The voltage was setup at 70V for DSSSD #1 and 100V for DSSSD #2.
The chamber was placed at 6.5 cm form the LiF target. That's mean that the sample is placed at 14.1 cm from the LiF target.
IMPORTANT!!!
The sample is toward detector DSSSD #2. So, the sample is placed at 2.5 cm from DSSSD #2 and 2.7 cm from DSSSD #1.
DSSSD #2 is the upstream detector and DSSSD #1 is the downstream detector. |
| Attachment 1: DSSSD1_Voltage_New.jpeg
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| Attachment 2: DSSSD2_Voltage_New.jpeg
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29
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Thu Mar 5 09:24:21 2026 |
FGI, SB | Run62 |
Gold + Mylar sample in beam
Starting time: 15:32:00
Stop time : 08:13:55
Blocks : 123407
Flux monitor
Starting time : 16:27:58
Duration: 60118
IMPORTANT!!!
The clocks are not sincronize |
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32
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Fri Mar 6 08:56:26 2026 |
FGI, SB | Run 65 |
Am-241 calibration source. Towards DSSSD #2 (PreAmp B) upstream detector
Starting time: 08:41:21
Stop time :
Blocks :
The activity of th source is 0.1 uCi |
| Attachment 1: Am_241_Source.jpeg
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31
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Fri Mar 6 08:55:16 2026 |
FGI, SB | Run 64 |
LiF #7 sample in beam
Starting time: 15:11:10
Stop time : 08:14:22
Blocks : 138311
Flux monitor
Starting time : 16:07:05
Duration: 613911
IMPORTANT!!!
The clocks are not sincronize |
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30
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Thu Mar 5 09:25:45 2026 |
FGI, SB | Run 63 |
LiF #8 sample in beam
Starting time: 08:34:15
Stop time : 14:53:02
Blocks : 55124
Flux monitor
Starting time : 09:30:14
Duration: 22727
IMPORTANT!!!
The clocks are not sincronize |
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28
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Thu Mar 5 09:22:58 2026 |
FGI, SB | Run 61 |
Boron-10 #3 sample in beam
Starting time: 08:49:16
Stop time : 15:07:34
Blocks : 44619
Flux monitor
Starting time : 09:45:09
Duration: 22696
IMPORTANT!!!
The clocks are not sincronize |
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27
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Thu Mar 5 09:21:10 2026 |
FGI, SB | Run 60 |
NaCl #5 sample in beam
Starting time: 15:29:51
Stop time : 08:19:57
Blocks : 99805
Flux monitor
Starting time : 16:25:55
Duration: 60601
IMPORTANT!!!
The clocks are not sincronize |
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25
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Tue Mar 3 15:28:37 2026 |
FGI, SB, CLW | Run 59 |
Before this run, we change the target for the neutron source. We are using a Triton target of ~200 ug/cm².
Starting time: 11:14:32
Stop: 15:03:16.
Flux monitor
Starting time: 12:10:44
Duration: 13723 |
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24
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Tue Mar 3 08:25:45 2026 |
FG,SB,CLW | Run 58 |
start: 08:24:49, 3.3.2026
stop: 10:13:25
blocks: 3062
Flux monitor
Start: 09:20:43
Duration: 6531
LiF no. 7 in beam |
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23
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Tue Mar 3 08:24:06 2026 |
FG,SB,CLW | Run 57 |
Start: 15:45:30, 2.3. 2026
Stop: 07:57:05 3.3. 2026
Blocks: 25524
Flux monitor
Start: 16:41:41 of 2nd March
Duration: 58288
NaCl Target 5 |
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21
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Mon Mar 2 13:24:11 2026 |
FG,SB,CLW | Run 56 |
start: 13:28:38, 2.3.2026
stop: 15:05:22, 2.3.2026
blocks: 2206
LiF no. 7 in beam |
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20
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Mon Mar 2 13:22:52 2026 |
FG,SB,CLW | Run 55 |
start: 10:14:0531 2.3.26
stop: 12:57:08 2.3.26
blocks: 3855
NaCl No. 4 |
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15
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Mon Mar 2 09:43:05 2026 |
FG,SB,CLW,TD | Run 54 |
start: 09:36:05 2.3.26
stop: 09:43:49 2.3.26
blocks: 14
Cu rod taken out, run in neutron beam with NaCl target. Distance chamber to target is 6.5 cm. Run stopped due to high trigger rate in channels 138,144. |
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12
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Sat Feb 28 08:59:14 2026 |
SB, TD, FGI | R53 |
start: 16:14:44 27.2.26
stop: 08:38:26 2.3.26
blocks: 48895
no change from R52 |
| Attachment 1: 10.png
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| Attachment 2: 11.png
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| Attachment 3: 12.png
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| Attachment 4: 13.png
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| Attachment 5: 14.png
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| Attachment 6: 15.png
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11
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Fri Feb 27 15:17:59 2026 |
SB, TD, FGI | R52 |
Start: 15:06:06 GMT
Stop: 16:13:45
Blocks: 875
Sample: NaCl + Au Frame #4
Beam on target, 2.25 MeV neutron energy, 10 uA protons on LiF 410 ug/cm2 target
Shadow cone, copper rod, 30 cm
Pulser: frequency 20 Hz, amplitude 5 V, other settings per R51
Upstream detector, preamp A, S9418#1
Downstream detector, preamp B, S9418#2
All RAL109 LLD 20mV
DAQ triggers c. 44Hz, accepted c. 40Hz
15.57.21 CET Stopped moderated BF3 monitor ABCD acquisition
Digitizer reconfiguration
15.57.31 Started moderated BF3 monitor ABCD acquisition
15.57.52 Stopped moderated BF3 monitor ABCD acquisition
Digitizer reconfiguration
15.57.56 Started moderated BF3 monitor ABCD acquisition
R52 stopped to permit change to BF3 counter DAQ configuration |
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10
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Fri Feb 27 14:38:28 2026 |
SB, TD, FGI | R51 |
start: 14:31:03 (w23 is set to GMT)
stop: 14:38:09
blocks: 98
Pulser walkthrough - amplitudes 5.0-1.0 @ 1.0 step
Attachment 1 - screenshot of all 64x ADC spectra with common x/y-scales
n+n Ohmic strips lower resolution cf. most p+n junction strips - increase DSSSD bias? |
| Attachment 1: 9.png
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14
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Sat Feb 28 12:09:56 2026 |
TD | Offline analysis data file R52 |
Offline data analysis of data file R52
c. 1h 2.25MeV neutrons from 10uA p+ + 410ug/cm2 LiF -> copper block -> sample #4 Mylar+NaCl+197Au
ADC data are offset corrected but not gain matched.
Attachments 1-2 - DSSSD#1 and DSSSD#2 ADC spectra (10keV/channel nominal)
Attachment 3 - ADC hit pattern (DSSSD#1 0-15 p+n/16-31 n+n, DSSSD#2 32-47 p+n/48-63 n+n)
Attachment 4 - energy (10keV/channel nominal) versus channel (DSSSD#1 0-15 p+n/16-31 n+n, DSSSD#2 32-47 p+n/48-63 n+n)
Attachment 5 - per DSSSD p+n junction energy - n+n Ohmic energy + 2048 (10keV/channel nominal) - with/without energy difference gates currently set to 1948-2148 (i.e.
non-
selective)
Attachment 6 - per DSSSD p+n junction energy versus n+n Ohmic energy (20keV/channel nominal) - with/without energy difference gates currently set to 1948-2148 (i.e.
non-selective)
Attachment 7 - scaler spectra (1000x rate updated every 60s)
Attachment 8 - sort program variables
Issues
From pulser tests and pulser walkthrough (R51) all channels are OK *except* channels 14, 40, 41 with no data
From data with beam (R52)
Channels 24-31 - little data - check RAL109 LLD?
Channel 23 - no ADC data => issue between preamp and Si wafer or RAL109 discriminator
Channel 36 - low amplitude ADC data => issue between preamp and Si wafer
Channel 58 - no ADC data => issue between preamp and Si wafer or RAL109 discriminator |
| Attachment 1: Screenshot_from_2026-02-28_02-49-29.png
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| Attachment 2: Screenshot_from_2026-02-28_02-50-34.png
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| Attachment 3: Screenshot_from_2026-02-28_02-52-04.png
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| Attachment 4: Screenshot_from_2026-02-28_02-53-50.png
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| Attachment 5: Screenshot_from_2026-02-28_02-54-56.png
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| Attachment 6: Screenshot_from_2026-02-28_02-56-06.png
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| Attachment 7: Screenshot_from_2026-02-28_05-10-24.png
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| Attachment 8: variables.dat
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$variables
offset( 0) = 20.04
offset( 1) = 18.62
offset( 2) = 17.61
offset( 3) = 18.31
offset( 4) = 17.17
offset( 5) = 16.32
offset( 6) = 15.96
offset( 7) = 15.89
offset( 8) = -2.51
offset( 9) = -7.08
offset( 10) = -8.34
offset( 11) = -8.70
offset( 12) = -7.39
offset( 13) = -10.89
offset( 14) = -9999.99
offset( 15) = -8.82
offset( 16) = -39.37
offset( 17) = -41.32
offset( 18) = -48.71
offset( 19) = -47.27
offset( 20) = -52.33
offset( 21) = -46.95
offset( 22) = -50.31
offset( 23) = -47.67
offset( 24) = -28.77
offset( 25) = -32.29
offset( 26) = -34.10
offset( 27) = -33.36
offset( 28) = -45.46
offset( 29) = -45.13
offset( 30) = -48.22
offset( 31) = -29.38
offset( 32) = 16.03
offset( 33) = 16.42
offset( 34) = 16.02
offset( 35) = 17.89
offset( 36) = 15.05
offset( 37) = 15.58
offset( 38) = 16.23
offset( 39) = 14.25
offset( 40) = -9999.99
offset( 41) = -9999.99
offset( 42) = -47.77
offset( 43) = -44.66
offset( 44) = -45.86
offset( 45) = -45.02
offset( 46) = -48.13
offset( 47) = -46.99
offset( 48) = -19.21
offset( 49) = -26.01
offset( 50) = -28.70
offset( 51) = -21.86
offset( 52) = -26.61
offset( 53) = -24.07
offset( 54) = -21.79
offset( 55) = -24.26
offset( 56) = -47.54
offset( 57) = -47.21
offset( 58) = -49.04
offset( 59) = -53.56
offset( 60) = -45.44
offset( 61) = -46.07
offset( 62) = -46.65
offset( 63) = -47.07
c(0) = 0.4453125
c(1) = 0.4453125
w(0) = 1948
w(1) = 2148
w(2) = 1948
w(3) = 2148
$[end]
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