 Fri May 6 16:41:57 2022, Patrick, Rodolfo, Laser, Wavemeter 
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We coupled the laser through a multi-mode fiber into the wavemeter.
With the main amplifier enabled, we got enough power behind the fiber (0.5 - 1.5 mW) to use the wavemeter with 34 ms exposure time (1s / 30Hz to prevent
jumps in the wavemeter readout).
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Mon May 30 02:33:45 2022, Patrick, MBS Max, DAQ, MBS procedure
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It is possible to keep go4 running now. Summary of the procedure:
DAC1: open file lxg1297:/data.local2/208Bi/208Bi -auto -rfio
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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 31 03:18:52 2022, Patrick, Konstantin, Laser, Laser timing
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The final timings are (in bins +-1):
PD NO: 103
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Wed May 11 23:34:39 2022, Patrick, Carsten, Detectors, Particle Detectors / Scraper positions
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Voltages of particle detectors off.
Scraper positions:
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Thu May 12 03:25:37 2022, Patrick, DAQ, Laser scan complete signal off
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As in ID:46, the 'laser scan complete' again is not coming in.
It is not very useful to repeatedly fix cable contact problems.
Therefore, Carsten is adding a 'number of steps' line to the config file to "repeat" the x-axis. |
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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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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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Wed May 11 22:19:17 2022, Max, Wilfried, Volker, Laser, laser bunch timing
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We overlapped the laser and ion bunch in the time domain. The delay has to be set on the module above the laser and NOT in the ESR Messhütte!
The values are:
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Wed May 11 22:45:22 2022, Max, Wilfried, Patrick, General, scanning wavelength
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The scan parameters for the next shift are:
in COBRACONTROL:
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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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Tue May 31 21:58:55 2022, Max, Rodolfo, Laser, MRC Settings for 209Bi
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We have change the laser settings for the spectroscopy of 209Bi.
We have now T-scraped the laser beam to the old position of the ion beam. The settings for the MRC system are shown in the screenshot below. |
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Mon May 30 02:12:20 2022, Max, Patrick, ~Konstantin, Ragan, Ken, Runs, runs night shift 30.05.
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These are the first runs of the substitute beamtime.
[TABLE border="1"]
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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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Thu May 12 15:34:47 2022, Max, Kristian, Sebastian, DAQ, laser scan, laser step and laser busy checked
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We checked all three signals in the Messhütte. Laser scan and laser step are OK.
The Laser busy signal is for large increments (0.1nm) also fine. For short increments like our usual 0.005nm increment the signal is irregularly.
Likely the laser busy status is too short. |
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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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Tue May 31 17:22:09 2022, Max, Carsten, Danyal, Rodolfo, Wilfried, General, change E-cooler current I_e = 50 mA
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At 17:15 we changed again the E-cooler current I_e = 50 mA
(4 laser scan loops per injection)
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Tue May 31 15:19:58 2022, Max, Carsten, Danyal, General, scans for different E-cool currents
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until 15:15 we have measured with I_e = 100 mA (3 loops per file)
E_cool HV = 225255 V
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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. |