 Thu May 12 15:50:33 2022, Max, Accelerator, No ESR beam
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Since 13:30 we have no beam in the ESR. There is a problem with the ESR septum.
The magnets department is investigating. |
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Thu May 12 16:35:17 2022, Max, Wilfried, Zoran, Accelerator, NO BEAM UNTIL TOMORROW MORNING
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The problem at the ESR septum is serious. They have to remove the broken part and try to repair it.
Maybe tomorrow in the morning briefing there will be more information about this.
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 Fri May 13 08:32:41 2022, Zoran, Accelerator, NO BEAM UNTIL TOMORROW MORNING
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> The problem at the ESR septum is serious. They have to remove the broken part and try to repair it.
> Maybe tomorrow in the morning briefing there will be more information about this.
>
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Fri May 13 11:46:51 2022, Sebastian, Simon, , Laser energy
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We (Sebastian and I) measured the output energy of the laser system again.
All values in [mJ] and over 500 laser-pulses average
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Fri May 13 16:55:58 2022, Danyal, Carsten, Phillip, Wilfried, General, End of E128 Beamtime
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Dear all,
unfortunately, the E128 experiment must now come to an early end.
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Mon May 16 14:20:05 2022, Ragan, Danyal, Carsten, Phillip, Wilfried et al., General, E128 Beamtime
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> Dear all,
>
> unfortunately, the E128 experiment must now come to an early end.
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Mon May 16 15:57:37 2022, Rodolfo, Laser, Wavemeter calibration 
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I have calibrated our Wavemeter WS7 using the temperature stabilized He-Ne Laser (SIOS EN60 825-1:2014). In the screenshots below you can see the readout
of the wavemeter before (vor) and after (nach) calibration. |
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Mon May 16 17:15:56 2022, Carsten, Analysis, DAQ /Analysis - shift of peaks in the accumulated spectra, changes in code
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After a phone call with Wilfried I implemented an offset to all hit channels of the stacked / accumulated spectra where one chekcs the timing peaks.
Therfore, I made a copy of the analysis in 208Bi1 (one "1" at the end). And here, in the file TLdaAnlProc.cxx I added an offset of +70 to the hit channel |
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Mon May 16 17:38:38 2022, Max, Danyal, Wilfried, Rodolfo, General, laser bunch timing
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We overlapped the laser and ion bunch in the time domain.
Therefore we delayed the bunching HF in order to see the PMT signal between bin 10 and 22. Before the signal Peak was in channel ~145-5 and difficult to
gate on.
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Mon May 16 18:01:23 2022, mbsMax, Danyal, Wilfried, Rodolfo, Patrick, Kristian, David, Ruijiu , Runs, runs afternoon/night shift 16.05
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These are the runs after the septum was repaired on 16.05.
[TABLE border="1"]
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Mon May 16 19:20:55 2022, Max, Wilfried, Analysis, start go4 before laser scan
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| It is necessary to start go4 before you start the laser scan. Otherwise you get an offset in the laser Step plots. |
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Mon May 16 21:08:48 2022, Rodolfo & Max, Laser, Laser power
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We checked the energy of the laser and optimized it a bit
[TABLE border="1"]
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Mon May 16 22:19:54 2022, Patrick, DAQ, Keep go4 running (in theory), MBS
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To accumulate more data into the opened go4, do not restart MBS, but just
sto ac
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Mon May 16 22:57:40 2022, Patrick, Kristian, David, Ruijiu , Detectors, Switched off nitrogen
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Background counts with nitrogen and air.
Less multiphoton events with air (see pictures, histogram extended to 30 with nitrogen).
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Tue May 17 00:44:01 2022, Patrick, Kristian, DAQ, Changed PMT North CFD channel
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In run 8134 - 8135 PMT North showed a super high background rate. After the scan we checked the signal cables.
Incoming signal was still good until CFD. We changed channel from 2 to 12. New threshold is 36, was 10. |
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Tue May 17 06:37:28 2022, YL, KM, Accelerator, Reduced beam intensity
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The resonance in 209Bi has been seen during the night.
Reducing the intensity by a factor~1000, to simulate 208Bi conditions
Running low intensity since ~6:15-6:20
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Tue May 17 10:38:44 2022, Konstantin, Detectors, PMT North changed
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| PMT located at the northern window was again replaced by the narrow-band PMT (ET Enterprise type 9423 SB, SN: 650). |
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Fri May 27 10:39:53 2022, Kristian, DAQ, PMT North noise
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During the last run, PMT North showed some weird noise.
The PMT was replaced by the deep UV PMT with small aceptance range (100-200nm) but there was still a lot of noise on the output channel in the Messhütte, |
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Fri May 27 14:57:23 2022, Rodolfo, Laser, Laser Energy
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I have started up the laser system (Q-Ray & Cobra) again. Here some parameters*:
- Q-Ray's output energy (@532 nm: 547 mJ.
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Fri May 27 20:39:50 2022, Carsten, Analysis, Short Manual for updated Go4 DAQ (version 2022_05_27)
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| Short descriptions of the most recent version of the GO4 code is attached. I will install the corresponding vesion early on sunday. |
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Mon May 30 00:56:33 2022, Max, Patrick, Laser, Beam overlap
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The ion beam positions are (+- 1mm):
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Mon May 30 01:13:40 2022, Konstantin, Max, Patrick, Detectors, XUV-Detector voltage off
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| XUV-Detector shows up to 100 kHz and, therefore, was turned off. |