 Tue May 31 07:29:11 2022, Ken, Detectors, XUV-Detektor
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Rate was very low: ~ 100Hz
Adjusted Walk level and Threshold, new rate: 5kHz
Additionally, parameters of the detector were varied for optimization but were returned to default afterwards. |
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Sat May 15 09:57:24 2021, Dayshift, Runs, Currently on schedule
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Enhance fluorescence rate and perform
laser bunch timing
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Wed May 12 02:16:25 2021, Danyal, Lars, Accelerator, Ion beam position
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Laser Position with scrapers verified.
1HA: impossible to scratch laser beam, still there at -1.0 mm
2HA: +3mm --> half the laser power on detector; +4.5mm --> gone |
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Mon May 10 07:58:13 2021, Danyal, General, Telephone numbers and Zoom link
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Telephone numbers:
ESR laser lab: +49 (0)6159 71 - 2882
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Tue May 11 15:49:30 2021, Danyal, General, setting up ESR
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| The operators are still busy extracting the beam from the SIS18 towards the ESR and injecting it into the ESR. |
Tue May 11 18:29:35 2021, Danyal, General, first ions in the ESR 
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Tue May 11 20:14:43 2021, Danyal, General, bad ESR vacuum
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I just heard that the ESR vacuum is quite bad.
There was a small vacuum problem a while ago, it was sealed, but apparently the pressure is not as low as usual.
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Wed May 12 02:34:29 2021, Danyal, General, instabilities in ion frequency
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The ion beam moves around, pretty arbitrary. See picture.
ESR crew believes that it is not due to fluctuations in the HV of the E-Cooler. |
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Wed May 12 13:11:58 2021, Danyal, Accelerator, short break between 13:30 and 15:30
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There will be a short break (2 hours) this afternoon. Between 13:30 and 15:30.
The so-calles "super lense" in the UNILAC needs to be cleaned (rinsed).
After that operation should continue as usual. |
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Wed May 12 15:36:04 2021, Danyal, Accelerator, general power failure in ESR! (everything is off)
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The power in the ESR is off.
(also on the gas-target area on top of ESR)
Electrical engineers are trying to find and fix the problem. |
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Wed May 12 22:35:33 2021, Danyal, General, frev and fb
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Schottky frequency (189th harmonic) = 244.033662 MHz
revolution frequency frev = 1.2911834 MHz
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Thu May 13 00:58:53 2021, Danyal, DAQ, unbunched ion beam
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Thu May 13 01:01:27 2021, Danyal, DAQ, bunched ion beam
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Thu May 13 01:05:45 2021, Danyal, DAQ, more stability by bunching
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Because the C3+ part of the ion beam is properly bunched, it is no longer so sensitive to the drifts caused by the e-cooler.
In the O4+ part of the ion beam these drifts can still be seen. |
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Mon May 17 21:43:56 2021, Danyal, General, The test beamtime was a success.
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Dear all,
The test beamtime is now over.
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Wed May 12 09:59:08 2021, Benedikt, General, Rigol DSG821 signal generator settings
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Thu May 13 20:18:10 2021, Benedikt, General, New f_rev
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| The ions were changed to a different speed today at 2 PM. The new revolution frequency is now 1.291278 MHz. |
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Thu May 13 21:00:48 2021, Benedikt, General, New reprate of the UV laser
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The lasersystem now operates at a reparte of 9.038946 MHz. This is 7 times f_rev (see previous post).
In the future, the laser-bunch-timing can be adjusted. |
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Fri May 14 11:01:33 2021, Benedikt, Calibration, Laser Beam adjusted
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The laser beam was adjusted in his position to overlap better with the ions.
Ion beam is destroyed at scraper position 1VO 6 mm and 2VO 4 mm; the laser beam looses half its power at 1VO 6mm and 2VO 4 mm.
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Fri May 14 16:37:01 2021, Benedikt, General, Status update
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Right now, we have to adjust the ion beam a bit to overlap better with the laser beam.
We keep the laser wavelength at resonance with the ions and try to optimize the fluorescence signal on the XUV detector while moving the ion beam. |