 Thu Mar 24 13:27:47 2022, Rodolfo, DAQ, Disk space - LXG1297 
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In our Linux computer (LXG1297: Laser spectroscopy) we have a Drive with 1.8 TB total disk space. 300 GB are at the moment in use, but I can clean this.
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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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Wed Mar 23 15:38:15 2022, Carsten, General, Not all lights in the ESR can be switched off
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Three of the lights in the ESR cannot be switched off. It seems that these lights are now "emergency lights" (with battery?). We will need to find dark
plastik foilor similar to cover those lights during our beam time |
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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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Mon Mar 21 16:33:23 2022, , DAQ, Changing code of go4
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We agreed to indicate changes in the go4 analysis code according to the
following scheme
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 Mon Mar 21 17:03:47 2022, , DAQ, Changing code of go4
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Correction: Comments in C/C++ start with // , i.e. forward slash
[B]//--2022-mm-dd HH:MM comment on the respective change[/B].
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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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Fri Mar 18 16:58:26 2022, Rodolfo, Accelerator, Pressure at North-East Arc
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The pressure at the north-east arc of ESR, where the laser window is located, looks suspicious. The sensor E01LF02 shows a value of 7.26E-8 mbar. For comparison
I have also upload a photo taken on 07.02.2022 where the pressure was 4.62E-10. We have contacted the vacuum expert and asked for his opinion. Waiting
for the reply ...
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Mon Mar 21 09:18:28 2022, Rodolfo, Accelerator, Pressure at North-East Arc
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Our vacuum expert has reply. The "IZ Pump" in this region was off.
[quote]The pressure at the north-east arc of ESR, where the laser window is located, looks suspicious. The sensor E01LF02 shows a value of 7.26E-8 mbar. |
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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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Fri Mar 18 09:18:38 2022, Rodolfo, Accelerator, Vacuum leak, ODR
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After the beaking out process we got a vacuum leak in one of the MgF2 windows (Referenz: PMT South) of the optical detection region (ODR) Stand 17.03.2022.
In order to avoid breaking the vacuum again and a second beaking out process we had to spread vacuum seal on the window.
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Thu Mar 17 17:56:33 2022, Kristian, Calibration, HV dividers
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PTB HV dividers arrived. Divider ratios are:
PT120: 12003,341
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Thu Mar 17 17:37:49 2022, Rodolfo, Accelerator, High voltage dividers for E-Cooler
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Two dividers, from PTB-Braunschweig, have been deliver today. We will use them to monitor the electron-cooler voltage in situ.
- PT120 (up to -120 kV) with scaling factor: 12003.341, and
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Wed Mar 16 12:04:40 2022, Kristian, Detectors, HV cable to particle detector South
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Checked HV cable to particle detector south. Label is HV2 Scraper.
Connected to Messplatz III HV5 |
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Wed Mar 16 08:31:52 2022, Kristian, DAQ, Check cables and timing
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Konstantin and I generated a signal in the Messhütte and sent it to the ESR.
There, we used a 44m BNC cable that was sufficently long to reach all detectors.
Our signal was connected instead of the PMT/PD. Hence, it was a roundtrip measurement.
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Thu Mar 10 15:20:26 2022, Jan , DAQ, analog branch signal patches to Messhütte
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The additional signals from PMTs and XUV detector needed for spectroscopic analysis in the second DAQ are patched to AP Messhütte (MH) via the red patch
panel at the inside of the target region. The patch channels F1 to F8 (also labeled A to H in red on white) are used and extended by a cable bundle to
reach below the mirror chamber. Inside the MH the signals arrive at the red patch panel and are forwarded to the blue patch panel close to the laser DAQ |
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Thu Mar 3 21:39:21 2022, Rodolfo, Laser, Dye solution, DCM in Ethanol and DMSO
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I have prepared a new dye solution of DCM in Ethanol and DMSO (1:1). The concentration of the "oscillator + preamplifier" is 0,3 g/l. The concentration
of the "main amplifier" is 0,0375 g/l or "1/8" the concentration of the "oscillator".
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Thu Mar 3 17:34:42 2022, Rodolfo, Laser, Pump Laser
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We have issues with our Pump Laser (Spectra Physics - Quanta Ray Pro). After the service made on mid Dezember (2021) the laser does not get started. After
contacting the service many times, the technicians think it can be an issue with the flashlamps.
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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 Mar 3 13:50:45 2022, Rodolfo, Laser, Dye cell cracket
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The "20 mm" dye cell used for the Oscillator and Pramplifier got damage. I supposed it was produced by the pump beam hitting on a very "old" dye solution
(DCM / Ethanol, concentration 0,3 g/l). The solution in the dye reservoir was more 12 months old. |
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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 Nov 5 17:23:23 2021, Rodolfo, DAQ, Dye trigger out
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The dye laser offers different scan settings (see pages 65 - 67 of the user manual). We are using the following setting, see attached screenshot, to produce
the status "laser busy" for the DAQ.
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