 Thu Mar 3 17:21:26 2022, Rodolfo, Detectors, MgF2 Windows 
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New reentrance viewports made of MgF2 have been installed at the ESR "Optical Detection Region". In the middle the old window (also MgF2) was kept into
place. |
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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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Mon Mar 21 21:48:46 2022, Jan, DAQ, MesyTec Shaper Control
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The MesyTec Shaper & Constant Fraction (MSCF) is used to process the PMT/det signals for the ADC in the second DAQ.
It can be setup on its front panel, but single channel setup is very tedious.
Remote control of the settings is possible using an epics server and client.
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Thu Apr 7 03:44:21 2022, Patrick, DAQ, Measurement procedure
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[U][B]Measurement procedure[/B][/U]
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Sun Apr 3 12:31:10 2022, Rui-Jiu Chen, Yuri, Carsten, Ragan, Runs, Measurement of beam with different circles 6x
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Parameters of NTCAP:
1. IQ rate 20 MSamples/s
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Mon Apr 4 09:10:44 2022, Ragan, Yuri, Rui-Jiu, Runs, Measurement
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NTCAP is taking data with the beam with a stop at manipulation 5 (taking all the fragments).
1)
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Thu Apr 14 10:57:11 2022, Carsten, Accelerator, Maintanence UNILAC / Op training
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We had no beam since about 1000. Also, we are still trying to find out why we have such a low intensity in the expereimnt.
Presently, there is a planned maintenance in the UNILAC, beam is expected back in 25-30 mins.
The profile grid TE3 in the transfer beamline in front of the target will be used to check if the extracted SIS beam has changed compared to before the |
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Fri Mar 18 16:51:27 2022, Carsten, DAQ, Main DAQ /MBS error
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| MBS error "TDC data ready wait" solved. Common stop trigger (20 kHz) was missing. (according to Sebastian) |
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Mon Apr 4 17:26:48 2022, Jan Glorius, DAQ, MSCF shaper settings
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attached are the current shaper settings.
list of currently connected channels:
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Tue Apr 5 08:00:50 2022, Kristian & Sebastian, DAQ, MBS Channellist (so far)
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MBS Channellist (time 5.4.2022)
0 Anode
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Sun Apr 10 03:56:56 2022, V. Hannen, Detectors, Low rate in PMT South
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PMT south shows a much lower count rate than observed in elog entry 170.
Yesterday the voltage on this PMT was increased to 2400 V and the threshold setting of the CAEN CFD to 90 units, (from 70 units before) however the low |
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Thu Apr 14 08:41:42 2022, Carsten, Accelerator, Low intensity at the experiment after series of failures during the night
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After the recovery from the failures during the night, we see much lower intensity at the experiment (measured with the particle detector count rate).
Instead of 8000-10000 cts we see only 3000-4000cts at comparable SIS intensities.
Also ESR cooler seems to be slightly unstable (wiggling lines) during injection. However, it is visually evident from the Schottky that the injected intensity |
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Tue Apr 5 23:55:11 2022, Carsten, Runs, Long time measurment with NTCAP
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Settings:
Center: 2242.5MHz
RefLevel: -25dB
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Fri Nov 19 15:50:44 2021, Rodolfo, Accelerator, Laser windows at E-Cooler side
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New laser viewports have been installed at the E-Cooler side of the ESR.
[IMG]elog:10/1[/IMG]
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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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Thu Apr 7 00:15:11 2022, Patrick, Laser, Laser timing adjusted
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We have adjusted the laser timing using PMT-middle. Bunching freq. is 3.90362 MHz.
PD NO: 7.79
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Tue Mar 29 12:01:08 2022, Rodolfo, Laser, Laser targets
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I have installed two targets* (size: 2 inches) to monitor the position of the laser beam.
- The internet cameras can be accessed from any browser, but only inside the GSI-Campus network. Benutzername: admin. Kennwort: 1234
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Sat Apr 9 06:42:23 2022, Kristian, Laser, Laser step size
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| We changed the laser step size to 0.002 nm which corresponds to 5.75 GHz. |
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Tue Apr 12 15:05:56 2022, Rodolfo, Laser, Laser status
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We have checked the laser power at 14:15 *
- Pump energy after Q-Ray @ 532nm: 559 mJ.
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Wed Apr 13 15:41:29 2022, Rodolfo & Sarper, Laser, Laser status
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We have checked the power of the laser and optimized it "a bit".
- Seed energy for the Cobra @ 532 nm: 508 mJ (before 496 mJ)*
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