 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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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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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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Sun Jun 22 22:29:04 2025, Carsten, Accelerator, Backup copy of present accelerator settings - don't use if you don't know what you are doing
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# Version: 1.3
# Comment: ParamModi Export at 2025-06-22T22:28:05.633712878+02:00[Europe/Berlin]
# Context: ESR_25_12_THORIUM_20June_v3.C1
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Sun Jun 22 21:36:48 2025, Carsten, Finn, Zac, Esther, Runs, First laser scans
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[B] Scan parameters:[/B]
[TABLE border="1"]
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Sun Jun 22 18:47:23 2025, Carsten, Peter, Marek, Simon, DAQ, PMT and particle detector settings
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Final voltages and thresholds for the PMTs and particle detectors before the first scan:
[TABLE border="1"]
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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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Sat Jun 21 22:33:04 2025, Peter , Danyal, Detectors, PMTs are switched off
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| We have switched off all 3 PMTs ! |
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Sat Jun 21 21:55:18 2025, Peter, Danyal, Marek, Detectors, PMT rates
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We have made two foam rings (outer diameter ca. 70 mm with a thickness of 10 mm each and placed them successively underneath PMT north.
ring 1: ID = 55 mm
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Sat Jun 21 18:00:49 2025, Carsten, Peter, Danyal, Kristian, Marek , Detectors, PMT signals
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Carsten and Kristian changed (18:00) the thresholds of PMT north and PMT middle in the ESR cave.
See picture below. The effect is negligible.
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Sat Jun 21 17:00:10 2025, Carsten, Peter, Danyal, Kristian, Marek, Detectors, PMT north exchanged
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We noted that the dark countrate of PMT north is about 20x higher than that of PMT middle.
We went into the ESR cave to look for stray light.
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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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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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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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Sat Jun 21 03:13:02 2025, Alex, Anton, Rodolfo, Hiroshi, Detectors, Part Det South
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Bunch signal on Particle Detector South. On the
[LIST]
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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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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 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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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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Sat Jun 21 00:23:22 2025, Rodolfo, Laser, Dye
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| I have prepared new (fresh) dye solutions of Fluorescein 27: 2 charges. They are in the Safety Cabinet (Sicherheitsschrank) in the ESR Laser lab |
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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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Fri Jun 20 11:25:32 2025, Julien, Kristian, Konstantin, Laser, Automated laser scans
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In contrast to entry [URL=https://elog.gsi.de/esr/E0052_2025/12]E12[/URL], the cabling for the automated start of the laser scan is now connected to [B]IO3
of sddsc221[/B]. |
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Fri Jun 20 06:37:51 2025, Konstantin, Accelerator, Position of contaminants
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I checked the positions of the contaminants. Therefore, I drove the scrapers and observed the signal at the Schottky detector
While the vertical positions are identical for all scrapers, the horizontal positions deviate due to the dispersion in the cooler section
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Wed Jun 18 20:24:01 2025, Carsten, Shahab, Ragandeep, Danyal et al. (the dayshift) and ESR crew, Accelerator, 229Th89+ identification
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We believe to have identified the 237U92+ and the 229Th89+ peaks.
Using the Schottky resonator at about 244 MHz and taking the 123rd harmonic:
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Wed Jun 18 19:05:28 2025, Carlo, Zac, Shahab, Ragan, Analysis, PID with rionid
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For PID with rionid we used:
- LISE file from last year (attached.
- .npz file from 410 RSA (attached). |
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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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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 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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Wed Jun 18 07:59:00 2025, Julien, Konstantin, Laser, Phase-offset
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We recognized that the output power of the pump laser was instable when externally triggered with 200kHz (stand-bye frequency of ESR). Therefore, we changed
the coarse timing offset of the pockels cell trigger compared to the flash lamp pulse from 215µs to 219.9µs.
Thereby, the output power increased from ~600mJ to 620mJ, and the PTP stability improved from 15% to 10%. The RMS stability improved from 2% to 1.2 %. |
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Wed Jun 18 03:12:25 2025, Rodolfo, Laser, Beam Stabilization
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The laser beam pointing has changed, even thought the MRC settings are the same as given in Entry 5 (this elog). This could be caused by a droping of the
laser output energy which is now 13,8 mJ @275 nm |
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Wed Jun 18 01:58:02 2025, Esther, Alexis, Anton, Rodolfo, Carsten, Accelerator, No Bunched Beam
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| The Bunching is not set properly. We do not see the ion bunch with the Photomultiplier. |
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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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Wed Jun 18 00:33:56 2025, Esther, Alexis, Anton, Rodolfo, Carsten, DAQ, R4l-41
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We have some issues with the RIO computer R4l-41 (DAQ1). We had to switch off completely twice. Only then it reacted properly. Maybe a problem with the
network at about 00:00 o'clock? |
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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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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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Tue Jun 17 09:32:00 2025, Konstantin, DAQ, Meda data acquisition
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The metadata provided by Medusa (Labview channels in former times) are now labelled correctly in Go4.
Most important data are "Cobra Set WL", "WS7 Meas WL", "PTB U scal", "Ohmlabs U scal", which correspond to the set wavelength, measured wavelength, voltage
measured at the PTB divider, and voltage measured at the Ohmlabs divider.
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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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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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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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Fri Jun 13 18:14:02 2025, Konstantin, Carsten, DAQ, DAQ Folder
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Dryrun of DAQs. Folders of the data are:
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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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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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Wed Jun 11 17:33:04 2025, Carsten, Jan, DAQ, DAQ2 - new computer , new directories (lxg0155 doesn't work reliably)
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LXG0155 (used in form er beamtimes) crashes and hangs and hangs eventually.
Lgx0155 is shut-down and is replaced by [B]lxg3113[/B].
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Wed Jun 11 16:44:39 2025, Carsten, Jan, Detectors, Detector voltages and thresholds for DAQ2 (Mesycontrol)
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Voltages (2650v) for the small band 9423 is ok. Signals are nicely separated from background, thresholds can be easily set.
For the broadband 9422 the voltage is by far too low. Signals and BG are barely separated.
Increased voltage from 1500V to 1750V (according to datasheet Vmax = 2500V, 1500 V is the min voltage for gain 1e6...).
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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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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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Tue May 20 16:14:30 2025, Rodolfo, Simon, Detectors, PMT arrangement at ESR
|
This is the arrangement of the photomultipiers at the optical detection region at ESR for Thorium 2025
|
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Wed Jun 4 16:18:57 2025, Rodolfo, Simon, Detectors, PMT dark count rates
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I adjusted the offsets of the amplifiers in the cave and measured the dark count rates :
[TABLE border="1"]
|
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Wed Jun 4 16:17:47 2025, Simon, Detectors, Nitrogen
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| The nitrogen supply for the PMTs is turned [B]ON[/B]. |
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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' |