 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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Sun Jun 29 03:03:56 2025, Nadine, Finn, Runs, Night shift runs with laser
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around 22:00 water cooling circuit failure of ESR electron cooler--> ~1h downtime
Wavemeter frequently overexposed around 549,3nm; other wavelengths are fine
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Sun Jun 29 22:06:19 2025, Carsten, Alex, Hendrik, Runs, Night shift 29.06.
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[TABLE border="1"]
Time | Part. Det. Int | SIS-intensity| accumulations in ESR | cooler-HV PTB K250 | cooler-HV PTB red | cooler-HV orange | LMD-DAQ1 Files | LMD-DAQ2 Files
| scan range(nm) | number of positions | dwell time (laser shots) | n loops | checked laser position | comments |-
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Mon Jun 16 21:47:23 2025, Carsten, Wilfried, Simon , Detectors, New threshold values for PMTs
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We adjusted the thresholds for the PMTs and increased the voltage of PMT middle to 2.7kV
[TABLE border="1"]
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Thu Jun 12 16:27:45 2025, Carsten, DAQ, NTCAP directory
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On the NTCAP the directory is changed to
Q:/E0052 |
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Sat Jun 28 06:29:58 2025, Stefan, Simon, Konstantin, 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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Sun Jun 29 06:11:49 2025, Stefan, Konstantin, Runs, Morning Shift 29.06.
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[TABLE border="1"]
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Mon Jun 2 16:36:57 2025, Carsten, Detectors, Mesycontrol 
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ssh -Y litv-exp@x86l-204
'mesycontrol' |
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Fri Jun 6 14:27:10 2025, Rodolfo, Konstantin, Laser, MRC Beam Stabilization Presettings
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These are the settings for the Beam Stabilization from MRC.
Laser-beam energy ca. 18 mJ @ 275 nm |
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Sat Jun 21 08:48:16 2025, Arya, Julien, Wilfried, Accelerator, Low 229Th particle numbers and 229Th lifetime in ring
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With reference to entry 37 Laser timing:
- at last 30 injections accumulation: 10k counts on particle detector (accumulated during manipulation until it saturates, e.g. no more Th in ESR)
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Sun Jun 29 18:04:11 2025, Carsten, Simon, Runs, Late shift 29.06.
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[TABLE border="1"]
Time | Part. Det. Int | SIS-intensity| accumulations in ESR | cooler-HV PTB K250 | cooler-HV PTB red | cooler-HV orange | LMD-DAQ1 Files | LMD-DAQ2 Files
| scan range(nm) | number of positions | dwell time (laser shots) | n loops | checked laser position | comments |-
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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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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 20 15:58:21 2025, Wilfried, Konstantin, Simon, Laser, Laser stepwidth
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From previous Bi-Beamtimes, we expect the width of the transition to be >50GHz (FWHM). The current step width is 0.002nm which corresponds to 8GHz, so the
laser would be in resonance for 6 steps.
We should aim for at least 5 steps in resonance.
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Sat Jun 21 02:32:24 2025, Alex, Anton, Rodolfo, Hiroshi, Carsten, Laser, Laser scanning setting
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This is the initial scanning range
[LIST]
[*] 3 Loops
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Sat Jun 21 07:28:35 2025, Arya, Julien, Wilfried, Laser, Laser Timing
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We roughly adjusted the timing based on attachment 1, for ions to be in center of electron cooler (east arc), corrected for PMTs being 2.5m closer to the
north on the west arc
then did a new 30 injection accumulation (10.8k counts on particle detector) and readjusted the timing to fine tune this
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Wed Jun 18 11:44:15 2025, Julien, Konstantin, Stefan, Rima, , Jitter CFD
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Pulses on photodiodes in entry 20
1. seem wide, so we also looked at qswitch signal; also seemes wide.
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Wed Jun 18 14:01:40 2025, Julien, Konstantin, Stefan, Rima, , Ion bunch on PMTs
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| Apparentlty did not work yesterday evening (no signal), but looks fine now (see attachment) |
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Tue Jun 17 16:33:16 2025, Carsten, Simon, DAQ, Gate Q-swtich
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| The gate generator of the Q-switch signal for the Vuprom TDC was set to 10ms. |
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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. |