 Wed Jun 15 13:11:38 2022, Guy Leckenby, DAQ, Signal Diagram 
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Attached is the signal mapping that will be used for the BEAVERTAIL test.
Note we plan to use 5 FEBEX cards to run 8 Si detectors because we will only use one pocket setup this time. In future, a solution using only 4 FEBEX cards |
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Fri Jun 17 15:32:47 2022, Guy Leckenby, Electronics, Preamp Settings
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Bias Select: In general, higher bias resistors -> lower electronic noise. However, higher resistance = larger voltage drop due to leakage current.
Our natural leakage currents at operating voltage of 60V range from 18nA (MSPad 15A) to 320nA (Design I 13). At maximum expected rate of 100Hz, our signal
induced leakage current is
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Mon Jun 20 10:36:56 2022, Guy Leckenby, DAQ, DAQ Startup Commands
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Three terminals/processes are required to record data on a local machine.
1. log in x86l-131.
cd to '2021-beavertail/febex3-x86l-131'
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Tue Jun 21 02:37:07 2022, Guy Leckenby, Iris Dillmann, Chris Griffin, General, Run notes
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Beam: 208Pb(82+), 269.0 MeV/u, ~2*10^7 ions in ESR
Position pocket outside: GE01DD2AG (A= aussen, outside)
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Wed Jun 22 18:01:18 2022, Guy Leckenby, Detectors, Detector Arrangment
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| Attached is the detector arrangement for the 3 setups used during the tests. |
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Wed Jun 22 19:14:12 2022, Guy Leckenby, DAQ, FBEX Script Choices
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Here were the f_user.c choices we implemented for this experiment.
Ln029: No white rabbit time stamp available so commented out. This needs to be done in the Go4 analysis script too.
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Tue Jun 28 17:42:53 2022, Guy Leckenby, DAQ, Cabling Changes
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In the previous signal map, I incorrectly mapped the DSSD channels. To correctly read out the DSSD for the new test, we will swap the Lemo cables into the
MSI-8, rather then messing with the flange. Hence, plug the old labels into the new channels as outlined
in the attached table. |
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Fri Jul 29 15:33:08 2022, Guy Leckenby, Electronics, Results of Noise Testing
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Uwe and I were able to get some noise testing done before the ESR was closed with asbestos exposure. We used the new flange so didn't address any issues
with the old flange. Our main findings were:
1. majority of noise comes from the connection to the ESR. Compare the two scope pics attached with a) the detector isolated from the ESR, and b) the |
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Mon Nov 7 14:14:38 2022, Chris Griffin, Guy Leckenby, Electronics, MSI-8 module details
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MSI-8 module details.
MMPR1 card configurations:
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Fri Nov 11 10:27:59 2022, Chris Griffin, Guy Leckenby, Detectors, Current leakage currents
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Attached are photos of leakage currents for the current GAGG and BGO setups.
This setup uses the new flange (blue gas inlet), all pads are biased to +60V, the DSSD to +40V and the SiPD to +100V.
Dry nitrogen from and LN2 dewar was flowing over the detectors.
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Tue Nov 15 14:30:25 2022, Chris Griffin, Electronics, Old flange noise
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Last week we tested both the new and old flanges with the GAGG housing set up described in the previous ELog entry.
Performance of the new flange was excellent, with clear signal and low noise contribution. We didn't take any photos of this as it was so textbook.
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Thu Nov 17 13:42:16 2022, Chris Griffin, Detectors, Detector config changes
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I have changed the configuration of Housing 2 (BGO) to account for the detector being fixed (bond wires) and provide a "plug-and-play" housing ready to
go for any future experiments.
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Mon May 29 12:23:48 2023, Guy Leckenby, Chris Griffin, Electronics, Old flange noise re-tests
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Whilst constructing a new flange to replace the old one, we did some tests again to compare the performance of new vs old flange.
See attached images:
1. Old flange, in the lab, no grounding attempts made, biased, n-sides.
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Thu Jun 1 09:39:24 2023, Guy Leckenby, Chris Griffin, Electronics, New new flange test
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We tested the new new flange using the same setup as in ELOG entry 14. The noise level seemed to be somewhere between the middle flange and the old flange.
See attachments:
1. Best noise conditions (grounding two planes and connection to ESR) on worst n-side pad.
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Thu Jun 1 10:42:31 2023, Guy Leckenby, Electronics, Summary of Preamp Testing
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MSI-8 and MPR-16 preamps have nominal differential output ranges of +/-1.8V and +/-1.2V respectively at maximum input (ie 5GeV).
All our FEBEX cards are now modified to accept +/-2V range. If serious pileup occurs, this could make it difficult to disentangle events for the n-sides.
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Tue Dec 12 12:57:16 2023, Jan, DAQ, test lmd-files with pulser
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We took a few lmd-files with different settings of the febex DAQ to provide data for go4 development, when the DAQ is not running.
The files are located at lxg1048:/data.local2/2023_pleiades
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