 Fri Apr 1 15:52:23 2022, Rodolfo, Detectors, UV PMT South 
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The "Solar Blind PMT" labeled as "PMT South" has been installed by Simon and Max in the gas target chamber on a CaF Viewport. The PMT is pointing directly
to the center chamber.
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Tue Apr 5 20:58:53 2022, Wilfried, Laser, Trigger for Laser
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Electronic for the timing of the laser puls optimized. The problem with the broad photodiode histograms is solved.
The photo of the oscilloscope picture shows in magenta the pulses from the (discriminated RF)/2, in yellow the pulses that are generated to open the Q-Switch.
The latter are generated by the coincidence of the 30-Hz trigger (2 microsec long) to
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Thu Apr 7 04:48:58 2022, , , ToDo's for 07.04.
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Some ToDo's for the next shift:
- Work on Laser stabilisation 2nd stage in the ESR
- Mesytec power supply of the xuv-detector crashed and needs to be restarted in the ESR. Simply turning it the crate off and on again)!!
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Sun Apr 10 08:53:26 2022, Kristian, Max, Laser, Timing verified
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timing is still good.
we checked the relative timing between laser and ions. the time difference between photodiodes, PMTs and particle detectors is still the same as original |
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Fri Apr 1 01:57:12 2022, Kristian, DAQ, Timing
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with bunched primary beam (bunching frequency 1.94070 MHz) we have strong PMT (mid) and particle detector signal. Time between both detectors was measured
(in 3.3ns bins)
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Thu Apr 7 00:36:36 2022, Uwe, DAQ, Threshholds and shaping Mesytec for ADC
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Mon Apr 11 12:50:22 2022, Kristian, Accelerator, Th lifetime
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We used the counter to measure the lifetime. During the 30 min scan time dropped only slowly.
During a longer break, e.g., when the laser flash lamps are changed, one could take data over a longer time. |
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Sat Apr 2 01:02:39 2022, Carsten, , Test measurements with two DAQs
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We do two measurements:
One measurement using the |
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Sat Apr 2 17:47:16 2022, Ken Ueberholz , , Telefon, Gästehaus
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| My guesthouse phone number: 06159-71-2957 |
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Fri Apr 8 01:18:51 2022, Ken Ueberholz, DAQ, TODO: DAQ improvements
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For somebody who knows the DAQ1 code: Go4 resets the histograms with each laser step. Can there be additional histograms where the data gets accumulated?
And possibly a histogram where important detectors are plotted against the laser steps? The read back wavelength of the wavemeter is not very precise. |
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Mon Mar 21 10:46:18 2022, Rodolfo, DAQ, TDC & Scaler description channels
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For the First Vuprom we have the following channel configuration (Stand:21.03.2021).
Please note 1.
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Tue Apr 5 09:39:01 2022, Danyal & Yuri, Accelerator, Strahl ist wieder im ESR - Schlitz war reingefahren
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Der Strahl ist wieder im ESR!
Angeblich war einen Schlitz, oder sogar 2, reingefahren worden.
Es könnte entweder der GEEXDR11S und/oder den GEEXDR1AS gewesen sein.
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Wed Mar 23 16:58:33 2022, V. Hannen, Detectors, Status copper mirror and XUV detectors
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Over the past days, the parabolic copper mirror and XUV detectors haven been prepared and tested for the upcoming beamtime (see first attached photo for
an overview of the detectors).
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Sun Apr 10 15:29:53 2022, Rodolfo, Laser, Status - Laser system
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We have checked the laser system.
- The pump laser has ~ 23Mio shots. The total output energy has dropped to about 475 mJ. Maybe it is time to install new fresh flashlamps. In case the |
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Fri Apr 1 11:00:41 2022, Rui-Jiu Chen, DAQ, Start NTCAP
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Start taking data with NTCAP.
Carrier Frequency: 245MHz
IQ rate:5 MSamples/s
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Tue Apr 5 13:28:06 2022, Kristian, DAQ, Spikes in PMT signal
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| Occasionally, we noticed a spike in the PMT signal. No ions in the ring and at PMT Cu was not even supplied with HV. Has to be some electronic pickup |
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Fri Apr 8 22:26:44 2022, Patrick, DAQ, Spike in all detectors
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In the previous shift, there was a spike in all detectors in the same scan step. Apparently, this was NOT a resonance since in the next step it appeared
again but at a different wavelength.
The current hypothesis is, that this is a disruption signal from one of the machines. |
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Fri Apr 8 15:45:24 2022, YL, , Spectrum manipulation 5
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| See attached |
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Thu Apr 7 16:50:22 2022, Konstantin, Calibration, Spacial laser-ion overlap
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Laser-ion-beam overlap was achieved after measuring the ion beam positions (compare [URL=https://elog.gsi.de/esr/E142/83]Entry 83[/URL]).
Screenshots are comprised in the following table.
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Fri Apr 8 15:42:20 2022, Yuri, Accelerator, Slits in the TE line
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At around 15:00, The slits in the TE line were changed to :
TE4DS5HL -12 mm -> -20 mm
TE5DSAH 0 mm -> +15 mm |