 Fri Apr 8 09:32:32 2022, Ragan, Runs, NTCAP stopped
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Since there is no beam, NTCAP is stopped.
Carrier Frequency: 242.2 M
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Fri Apr 8 09:13:38 2022, Ragan, Danyal, Accelerator, No beam
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Cathode is being changed at the ion source. So no beam for the moment.
Sergey has been contacted to change from two ion bunches to a single ion bunch in the ESR. |
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Fri Apr 8 08:40:06 2022, Sebastian, DAQ, DAQ improvement
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Concerning ID 146 a new histogram for accumulating data (no cleaning histograms) can be found under
Step2_Anl/TDC/TDC***_accumulated_*** |
Fri Apr 8 08:17:52 2022, Sebastian, Laser, Laser Ext Trig is working 
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We (Max, Kristian, Danyal, me) fixed the "external trigger" problem.
1.) The delay between lamp sync and Q-switch trigger was too long. The delay must be 200µs (3rd picture)!
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Fri Apr 8 06:53:29 2022, Ragan, Runs, NTCAP data taking
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NTCAP is taking data since 07.04.2022 23:53:47
Carrier Frequency: 242.2 M
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Fri Apr 8 05:46:35 2022, V. Hannen, Detectors, High background rate in Cu PMT points to light leak in ESR or active pressure gauge
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The background rate of the Cu mirror PMT is only about 300 cps when the mirror is in the parking position but ca. 7000 cps when in the beam position, even
if no beam is present in the ESR. This was noticed when we had an "empty injection" into the ring, causing the Cu mirror to drive into the beam position
with no ions present.
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Fri Apr 8 03:54:39 2022, Patrick, Laser, Q-switch window
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The solution of increasing the Q-switch window from 2us to 5us described in [I]ID:148[/I] fulfills its purpose, but the window is unstable.
We saw the laser jumping across the screen which was because the Laser had a lot of hickups.
The hickups come from the signal which determines the duration of the window.
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Fri Apr 8 02:14:05 2022, Wilfried, Laser, Laser timings adjusted
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Since we use the middle window as a reference for the laser pulse timing, the fact that the window is 2.25 m behind the target has to be taken into account.
From here the ions have 10 ns less time of flight to the middle of the electron cooler than they need for half a revolution. The signals were still symmetrically
aligned around the reference bunch as it was done yesterday. Therefore, the delay of the laser pulse was reduced by 10-ns on the oscilloscope, which led |
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Fri Apr 8 01:48:57 2022, Patrick, DAQ, Bugged Trending plots?
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The wavelengths/frequencies shown in the graph in the labview window do not match the wavelengths/frequencies in go4.
Compare the picture which shows an incomplete laser scan although the scans in the labview window are completed (The measurement was started at an 'elapsed
MBS time' of 2700s and took 1700s/28min).
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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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Fri Apr 8 00:06:37 2022, Patrick, Laser, Connection to the laser pc
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To login to the laser pc use the command
xfreerdp -g 1920x1080 -u atplaser atppc023.campus.gsi.de |
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Thu Apr 7 22:18:06 2022, Night shift 7.4-8.4, , Next scans
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DAQ1: lxg1927:/data.local2/BeamTimeTh22/
DAQ2: lxg0155:/data.local2/E142/
LMD file name DAQ1:229Thor
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Thu Apr 7 19:13:26 2022, Konstantin, Patrick, Calibration, How to find the correct laser position
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In order to achieve the correct laser ion beam superposition one needs to do the following steps:
[LIST=1]
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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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Thu Apr 7 16:45:10 2022, , Detectors, Detector distances
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| Relativ distances of the detector |
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Thu Apr 7 15:18:25 2022, Danyal & Sebastian, DAQ, DAQ channels
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We checked again the cables for both DAQs
(on Carsten's kind request)
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Thu Apr 7 14:13:27 2022, Danyal, Detectors, new PMT south
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I have replaced the PMT south (looks at the gas target).
in the hope that this will produce less dark counts.
Thus far, the dark countrate is low (few Hz).
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Thu Apr 7 14:04:36 2022, Paul Indelicato, General, no beam until 17:00
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10:10 There is a problem with the UNILAC.
The repair will take several hours. (4 hrs?)
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Thu Apr 7 14:01:22 2022, Sebastian, Max, Detectors, Mesytec reset
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The Mesytec crate was turned off and on again.
It is again possible to communicate with the XUV detector via python to apply voltage and current. |
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Thu Apr 7 11:11:31 2022, Max, Sebastian, Laser, dye changed, pulse energy measurements
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We changed the dye at 10am.
We increased the pump power for the dye Laser to 480mJ (before 450mJ). New calibration factor is 29 for Quanta Ray monitor signal.
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