 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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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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