 Sat Jun 28 06:29:58 2025, Stefan, Simon, Runs, Morning shift 28.06.
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6:30 Problem with ion source, on-call service is called
7:30 There is a short in the ion source and it needs to be changed. Expected down time about 2h
10:30 Ion source was successfully changed, but while ramping up the source a power supply failed. Next on-call service is on their way to GSI.
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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 |
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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 / |
Fri Jun 27 06:55:45 2025, Esther. Konstantin, Laser, Laser-ion overlap 
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We cross-checked the laser-ion superposition by using the T-scrapers. We did it only after the scans in order to do not change the duty cycle by much. Attachements
are in the order of the measurements compiled in the table.
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Fri Jun 27 06:13:02 2025, Esther, Konstantin, Runs, Early shift - data taking
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[B]Notes:[/B]
1. TE slits at -10 and +10
2. SIS intensity unstable until about 9:00 after that it became much more stable
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Thu Jun 26 22:51:04 2025, Hendrik, Finn, Runs, Nightshift data runs
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After the scan at 22:04 teh FCU new was new calibrated. For this MEdusa was stopped and reopened in the laser lab. This stops the Labview server, and as
a consequence the the connection to the MBS was lsot. Then, MBS needs to be restarted and the online data is cleared. Such an intervention should avoided
as good as possible.
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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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Thu Jun 26 19:01:46 2025, Carsten, Jan, Simon, Runs, Late shift 26.06.
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[B] Scan parameters:[/B]
[TABLE border="1"]
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Thu Jun 26 18:13:17 2025, Jan, Carsten, Detectors, PMT voltages & thresholds
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current settings of PMT voltages and thresholds at the CAEN CFD:
PMT South [HV ch2: 2700V] [CFD ch0: 8]
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Wed Jun 25 05:53:54 2025, Rodolfo, Laser, FCU
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| Cobra's FCU was recalibrated. Table saved as FCU_547-554_RS_2024-06-25.fcu. |
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Tue Jun 24 22:24:36 2025, Carsten, Finn, Hiroshi, Esther, Rodolfo, Runs, Data taking (night shift 24.06.)
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[B] Scan parameters:[/B]
[TABLE border="1"]
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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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Tue Jun 24 12:25:34 2025, Carsten, Detectors, PMT behaviour - noise / PMT voltages / CFD Threshholds / CAEN Power supply (broken channel resetted)
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In position North there is still the "old" 9423B PMT that draws quite some current.
On this detector threre is also some quite substantial noise. Very likely the base is not ok any more. Noise was much lesss for the other two PMTs.
Since position NORTH is the position with the largest sold angle, if there is another break from the accelerator we should exchange it against SOUTH.
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 Tue Jun 24 17:39:13 2025, Carsten, Stefan, Simon, Rima, Nils, Detectors, PMT behaviour - noise / PMT voltages / CFD Threshholds / CAEN Power supply (broken channel resetted)
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PMT North and South have been changed:
CFD CH0: Middle Thr 7 / CAEN HV Ch1: 2750 V
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Tue Jun 24 15:44:06 2025, Konstantin, DAQ, Phase shift in DAQ1
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In the SetParameters.C file is a parameter called fPar->piPhaseOffset. It was shifted from 100 to 50 in order to see ion bunches in the pmt signal and laser
pulses in the photodiode signal during the same revolution in the TDC spectrum. Note that this parameter must be taken
into account when setting the window conditions of the arrival time in the SetConditions.C file. |
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Mon Jun 23 18:36:39 2025, Wilfried, Simon, Detectors, PMT test with LED
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We tested the PMTs again, this time with an UV LED that is mounted at a window close to the XUV detector.
PMT south showed a very clear increase in count rate from about 1 to 50 Hz.
PMT mid also showed a small increase by a few Hz.
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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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Mon Jun 23 10:52:34 2025, Julian, Lukas, Zsolt, Nadine, Konstantin, Laser, Frequency conversion unit
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We exchanged the old BBO of the Cobra's FCU with a new one. The output power of the Cobra was around 120mJ. In the end, we achieved a UV power of about
21mJ. In addition, we optimized the fiber-coupling to the wavemeter. |
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Mon Jun 23 01:01:17 2025, Carsten, Detectors, CAEN PMT Power supply
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Since yesterday, channel 0 of the CAEN PS is dead (no voltage even without cable).
Changed detector south to channel 3. |
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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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