 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 ! |
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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