 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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Mon Mar 24 14:44:14 2025, C Griffin, M Cockshutt, I Dillmann, General, April 2025 experiment setup
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Further PLEIADES tests are to be carried out during E018 and E203. This will be an important test of PLEIADES operation in isochronous mode and provide
an opportunity to try better understand the PID
"handle" seen in the analysis of the data collected in 2022.
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Fri Mar 28 13:31:53 2025, CG, ID, MC, JG, General, Dual PLEIADES installation at ESR
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PLEIADES detectors were installed in both the inside and outside pockets after the dipole behind the gas jet.
The detector include the GAGG crystal is installed in the outside pocket and read out by DAQ computer x86l-131.
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Fri Mar 28 20:45:08 2025, CG, Electronics, MSI-8 configurations
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The MSI-8 modules were reconfigured to properly instrument the current setup.
For each detector:
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Fri Mar 28 22:45:24 2025, CG, Detectors, Bias problems
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After testing the biasing scheme for all detectors, two problems emerge.
On the inside pocket, one SiPad (SiPad#3 - Design-I 13) shows a linear current response to bias.
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Sat Mar 29 15:51:46 2025, CG, JG, MC, ID, General, DAQ setup
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********************************************
** Setup of DAQ x86l-131 (outside pocket) **
********************************************
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Sat Mar 29 17:19:46 2025, CG, JG, MC, ID, General, Sample data file
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Data files written to /mnt/raw.data/e0203_e0018.
From MBS computers:
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Sat Mar 29 17:53:13 2025, CG, ID, MC, Electronics, Bias remote control
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The MHV modules are set up for remote control. This can be accessed via the mesycontrol software running on x86l-128.
A configuration file has been save to: esr/usr/litv-exp/DAQ-control/mesycontrol/pleiades_2025_v2.xml |
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Mon Mar 31 17:55:16 2025, JG, DAQ, DAQ overview
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The DAQ is running of 4 different nodes/PCs, that can be accessed by ssh using the user litv-exp.
[TABLE border="1"]
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Mon Mar 31 18:21:37 2025, JG, DAQ, ESR scaler mapping
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This is the list of scaler channels used at the VME ESR DAQ on x86l-204:
[TABLE border="1"]
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Mon Mar 31 18:35:46 2025, JG, DAQ, lmd files on ESR NAS
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The files of each MBS node or the timesorter are written to the ESR NAS by the RFIO server.
The server is running on the virtual machine atprfio.gsi.de.
The NAS is mounted there and we write data to the subfolder: /mnt/raw.data/e0203_e0018/
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Tue Apr 1 17:18:10 2025, ID, MC, CJG, Detectors, Both PLEIADES detectors in beam
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We started inserting the inside and outside detector, see
https://elog.gsi.de/esr/E0203_E0018/46
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Tue Apr 1 22:41:52 2025, CG, Detectors, Climbing leakage currents
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The experiment has been running stably during the afternoon.
DAQ rates have remained constant and the frequency of hits in the Go4 has remained 1 hit every ~few mins.
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Tue Apr 1 23:00:41 2025, CG, General, Run stopped and detectors moved back
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Due to the continued rise in leakage currents, I have stopped the run, moved the detectors completely back and turned off the
bias to all detectors.
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Thu Apr 3 13:09:28 2025, JG, DAQ, 194Pb MBS settings
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The settings of the MBS daq during the first data taking with fragments around 194Pb (W.Korten experiment) was not entirely correct:
1. both FEBEX nodes had the very same sub-sytem identifier 0x200. The timesorter did merge the two data streams into the lmd files. Now the events cannot |
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Thu Apr 3 13:24:31 2025, CG, Detectors, Bias problem diagnosing
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During an access break to the ESR, I made a few tests with the bias scheme to see if we could better understand some of the weird quirks.
Two detectors showed likely shorts during initial setup - these detectors were still cabled to the bias network though.
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Thu Apr 3 14:53:13 2025, ID, Detectors, Link to leakage current Google doc
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Please enter the leakage currents from the mesycontrol every ~1h into this Google document:
https://docs.google.com/spreadsheets/d/1Gt1tFHwn4XFrJ5_-nQvTi635UD0aHgN6gCdXDTHQdkI/edit?gid=299353113#gid=299353113 |
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Thu Apr 3 17:37:04 2025, CJG, GL, MC, General, Detectors in position, taking data
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The inner detector was moved into position.
The device control for the outer detector is not responding and I am not an expert/don't know how to make it work.
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Fri Apr 4 16:12:36 2025, CJG, GL, MC, JG, ID, General, Moving PLEIADES in
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186Hf now stored stably in the ring.
Will move both detectors in to position.
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Fri Apr 4 16:27:11 2025, CJG, GL, MC, JG, ID, General, PLEIADES in position
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Inner PLEIADES detector moved into position at +2mm.
Again, the outside pocket cannot be moved.
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Fri Apr 4 21:15:13 2025, CJG, GL, MC, ID, General, Changes to setup
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After talking to T. Davinson this afternoon a few things became clearer.
Because of the huge increase in leakage currents, and the 20 MOhm bias resistors uses across most of the pre-amp cards, it is likely that the induced voltage |
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Sat Apr 5 12:28:20 2025, CG, GL, ID, General, Detector moved in
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Inside pocket moved in to 2mm
run0024 started @ 12:27:50 |
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Sat Apr 5 12:38:49 2025, CG, General, Current status
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Given that I hope we are now moving towards stable operation, here is the current status of detectors for run0024 on...
Inside pocket (x86l-124, 0x200)
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Sat Apr 5 12:54:20 2025, CG, MC, Detectors, Bias curves
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Bias curves were completed for most detectors yesterday evening.
General news is that, due to the massively increased leakage currents, we were likely not fully depleting the detectors up until yesterday.
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Sat Apr 5 13:20:10 2025, ID, CG, GL, General, MHV-4 max current
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The leakage currents are 6-7 micro-amps for the Si pads at the moment. The max current for the MHV-4 is 20 microamps PER CHANNEL, so we should be fine.
https://www.mesytec.com/products/nuclear-physics/MHV-4.html |
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Sat Apr 5 14:11:55 2025, CG, GL, ID, General, Run stopped - detectors toast?
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run0034 stopped at 14:11
Leakage currents are increasing and once again we are not fully depleting the pad detectors at 150V.
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Sat Apr 5 15:19:11 2025, Team PLEIADES, General, Run started
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15:14 Started run #35: inside pocket at 20 mm.
Trigger mask changed. Gated only in ch8 in MSI-8 #2 (one side of photodiode)
No events hitting the detector yet.
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Sat Apr 5 17:49:06 2025, CG, GL, ID, Detectors, Outside detector moved in
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After some Sergey-magic the outside pocket moves again. We slowly moved the outside detector in, we are clipping the beam at -20mm. Moved the detector to
-40mm and take some data as of 17:48 (run0036.lmd)
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