 Wed Apr 13 14:29:04 2022, Carsten, Rodolfo, Sarper, David, Pierre-Michel, Max, Sebastian, Runs, Afternoon - morning shift runs 13.+14.04. 
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Changed the wavelength scan range from [B]321.62 - 321.10 nm[/B] to [B][B]321.12 - 320.60[/B] nm[/B] after one scan.
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Thu Apr 14 17:47:55 2022, Carsten, Rodolfo, Konstantin, Sarper, Runs, Afternoon shift runs 14.04 changing the wavelength scan range
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The new scan range is changed from [B]321.12 - 320.60 nm to 320.62 - 320.10 nm[/B]
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Thu Apr 14 22:44:40 2022, Patrick, Simon, Danyal, Max, Runs, Runs night shift 14./15.04.
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Runs of the night shift. The wavelength range is 320.62 - 320.10 nm.
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Sat Apr 16 04:19:05 2022, Patrick, Simon, Alex, Sarper, Runs, Runs night + morning shifts 16.04.
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Runs of the night shift 16.04. after changing the wavelength range. The new range is 320.12 - 319.859 nm. The step size was decreased from 0.002 nm to 0.001
nm.
The goal was to have the same number of scans as before (261), however, the scan range in the labview program could not be set accordingly. We decided |
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Mon Jul 26 17:15:47 2021, Rodolfo, Laser, Quanta Ray - Water leak
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| On Thursday afternoon (22.07.2021) a water connector has broken and water has been spilled in the laser head. |
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Mon Jul 26 17:58:52 2021, Rodolfo, Laser, Water Filters
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| The water filters (deioninzing and particle) have been replaced. |
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Mon Aug 2 10:54:44 2021, Rodolfo, Laser, Quanta Ray - Water leak in the power supply
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After fixing the broken water connector in the laser head a new water leak appeared in the Quanta-Ray power supply.
We found the leak in the water pump flow line (arrow up). We took the water connectors appart, rebuilt the teflon seeling and put the water connectors |
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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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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 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 24 16:59:35 2022, Rodolfo, Laser, Photodiode signal SO
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Fast Photodiode signal at the "SO-Bogen" (South-east arc).
- Average made over 250 samples.
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Fri Mar 25 14:31:24 2022, Rodolfo, Laser, Photodiode signal SO in the Messhütte
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Measured at the Panel "Messhütte - Laserhütte", BNC "Fast PD / SO".
- Average over 256 samples |
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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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Tue Mar 29 21:37:13 2022, Rodolfo, Laser, Pump Laser
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The gold "reflectors and end plates" of our pump laser (Quanta-Ray PRO) have been exchanged by new ones.
- Output power after Oscillator and Amplifier (@ 1064 nm): 41 W.
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Sun Apr 3 13:05:08 2022, Carsten, Laser, Distance of Partilce detecotrs wr.t. to electron cooler
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As of Yuris post in the elog the positions (Info from H. Weick):
The postion of the particle counter behind the cooler is 21.6 m behind the middle of the cooler.
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Sun Apr 3 18:41:11 2022, Konstantin and Rodolfo, Laser, Beam Position Stabilization
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We (Konstantin and I) have optimized the TEM "laser-beam position stabilization".
- I took some pictures (screenshots) about the current setting*.
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Tue Apr 5 20:16:13 2022, Rodolfo, Laser, Discriminator for HF reference signal
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For the laser trigger we need to generate a few ns NIM-puls from the HF reference signal. Therefore we (Wilfried, Konstantin and me) have changed the constant
fraction descriminator (CFD) to generate this kind of pulse.
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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 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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Thu Apr 7 01:19:05 2022, Patrick, Laser, Laser scanning
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| We did some laser scans. The wavemeter shows spikes during scans. This may be just while the frequency changes. See picture. |