 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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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 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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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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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 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 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 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 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 29 15:53:45 2025, Carsten, Simon, Accelerator, No scans possible
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15:45 Right now, we are waiting for stable conditions again. There are problems with both the ion source and the accumulation in SIS.
16:20 SIS and source look better now, but now ESR makes trouble. The stacking looks off and after deceleration and cooling barely any Th-ions are stored. |
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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 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) |