 Wed Jun 11 11:20:23 2025, Konstantin, Simon, DAQ, octal gate generator delays
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We checked the set delays of the OG 8000 octal gate generator and compared them with the values measured before the Bi-beamtime (see [URL=https://elog.gsi.de/esr/E0038/34]entry
34[/URL]).
All values match within an uncertainty of <1ns
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Wed Jun 18 08:07:17 2025, Julien, Konstantin, Laser, new FCU Calibration 
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UV power was not stable but dropping from ~18 mW to 13 mW after opening COBRA shutters.
New calibration of frequency conversion unit:
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Thu Jun 12 15:53:13 2025, Carsten, DAQ, data directory and backup disk (WDBook2 RAID)
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The data of DAQ1 are stored in the following directory and with the following filenames
open file /data.local2/2025_229Th/2025_229ThDAQ1_ -auto -rfio
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Sat Jun 21 01:40:31 2025, Carsten, Alex, Anton, Rodolfo, Hiroshi, Accelerator, beam parameters
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The revolution frequency for the measurement condition is: 1.542728 MHz.
The electron cooler voltage is: 104411 V. |
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Wed Jun 18 00:56:28 2025, Carsten, Rodolfo, Anton, Alexis, Esther, , beam overlap with t-scrapers
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When testing the overlap between laser and ion beam we observed the following positions:
[TABLE border="1"]
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Sat Jun 21 03:06:19 2025, Rodolfo, Alex, Hiroshi, Anton, Laser, beam overlap with t-scrapers
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[TABLE border="1"]
motor|ion beam position (mm) from outside|ion beam position (mm) from inside
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Thu Jun 26 21:27:34 2025, Carsten, Jan, Simon, Calibration, Timing
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We checked the timing (before the start of the measurement cycle documented below).
Timing and measurement window are attached. |
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Fri Jun 27 11:21:25 2025, Esther, Konstantin, DAQ, Timing
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We cross-checked the timing. Laser pulse is detected at bins 136 (PD-North) and 171 (PD-south), respectively. Therefore, the laser puls is in the electron
cooler at 153.5. The revolution period corresponds to 3e8Hz / 1.54315MHz = 194.
The ion bunch must travel 2.5m more than the half of the circumference (108.3m). Taking this into account, the ion bunch must be detected (0.5 + 2.5 / |
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Mon Jun 16 22:27:01 2025, Carsten, Simon, DAQ, Thresholds
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We also adjusted the thresholds for the mesytic.
Doing that, we noticed that one of the trafos is broken (5th row, middle).
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Sat Jun 21 11:42:50 2025, Arya, Julien, Wilfried, General, Test laser scan
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Test scan to see whether laser spot is moving while scanning
Aborted accumulation because SIS stopped. 12.9k counts
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Tue Jun 17 19:25:30 2025, Rodolfo, Accelerator, T-Scrapers in E-Cooler
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Here are the instructions to drive the T-Scrapers inside the ESR Electron Cooler
[LIST]
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Sun Jun 22 23:48:35 2025, Carsten, Accelerator, Summary of todays settings and tests
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Scraping, beam intesnity optimizations and nuching were set up and optimized during the day.
[B]Initial findings[/B]
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Sat Jun 21 00:52:07 2025, Carsten, Accelerator, Summary of the last days (bunches wiht several isotopes still in ) / frequency of the
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Initially, we has very low SIS beam intensities in the 1e8 region. Setting up ESR wiht Stacking etc. turned out to be extremly tedious for the ESR crew.
Yet, they managed to get stochastic ooling working early on.
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Sun Jun 22 11:31:59 2025, Arya, Carsten, Julien, Konstantin, General, Summary morning shift
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1. UNILAC running again, so we resumed the beam tuning wherre we stopped yesterday at 14:00
2. Goals: Reduce intensity and lifetime of "antibunch" contamination while maximising intensity for main bunch/on PD
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Mon Jun 16 07:26:01 2025, Konstantin, DAQ, Startup of Medusa and DAQ1
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The laser control software (Medusa) is hosted on the Windows PC ATPPC023. First connect via the command
atplaser@lxg1297:~$ [B]xfreerdp /w:2500 /h:1400 /u:atplaser /v:atppc023.campus.gsi.de[/B]
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Tue Jun 24 18:49:18 2025, Carsten, Rima, Nils, Simon, Runs, Second attempt (Late shift 24.06.)
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[B] Scan parameters:[/B]
[TABLE border="1"]
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Mon Jun 23 10:59:36 2025, Julian, Lukas, Zsolt, Nadine, Konstantin, Runs, Scan routine
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-Start new injection
->wait for 60 injections to be complete
->note down SIS intensity (at extraction)
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Sat Jun 28 15:28:22 2025, Carsten., Uwe , Runs, Runs with new scan range
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22:10 SIS Trafo GS09DT scale was changed to 4e8 (not just the lassie monitor)
23:50 Ausfall ESR: GE01 KP01 bis KP05 und KP22 bis KP24; Korrekturelement: GE02KX6 und GE01KX2; beam loss during measurement
01:45 reser press air Scrapers: GE02DD2_G (sc8,11); GE02DS03HG(sc7,8,11); GE01DD2IG(was sc7,10,11)(now7,8,11)
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Fri Jun 27 22:14:35 2025, Anton, Finn, Carsten, Runs, Runs night shift 27.06. 28.06
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22:10 SIS Trafo GS09DT scale was changed to 4e8 (not just the lassie monitor)
23:50 Ausfall ESR: GE01 KP01 bis KP05 und KP22 bis KP24; Korrekturelement: GE02KX6 und GE01KX2; beam loss during measurement
01:45 reser press air Scrapers: GE02DD2_G (sc8,11); GE02DS03HG(sc7,8,11); GE01DD2IG(was sc7,10,11)(now7,8,11)
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Fri Jun 27 14:23:39 2025, Nils, Wilfried, Carsten, Julian, Runs, Runs afternoon shift 27.06.
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15:30 We have a break due to an issue at UNILAC (quadrupole failed). Also radiation safety interlock was triggered at the fragment separator. This also
pushed a faradaycup into the ESR (GE01DC3VP).
Just before the issue during the last bunching, the peak was misaligned to the marker in the Schottky. The marker was sitting on the right flank. So the |