 Thu May 12 15:21:23 2022, Sebastian, Simon, Laser, Flash lamps changed
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We (Sebastian and I) changed the flash lamps of the Quanta Ray Laser and measured the output energy of the laser system afterwards (still during warm up).
All values in [mJ] and over 500 laser-pulses average
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Fri May 13 11:46:51 2022, Sebastian, Simon, , Laser energy
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We (Sebastian and I) measured the output energy of the laser system again.
All values in [mJ] and over 500 laser-pulses average
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Tue May 10 23:10:25 2022, Sebastian, Patrick, Volker, Guy, Accelerator, T-Scraper Reloaded
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We have established a Control to "manually" move the T-Scrapers via a "remote desktop". We can now move both scrapers in the horizontal direction too.
We are now T-scraping the ion beam for determining its position in the vertical and horizontal directions. |
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Thu May 5 15:24:34 2022, Sebastian, Laser, laser busy problem
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Current status:
Laser busy signal works correctly (5V if the grating moves, 0V if not) if the laser is operated by the Sirah software.
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Fri May 6 10:30:23 2022, Sebastian, DAQ, laser busy / dye out signal fixed 
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Solution for a working laser busy / dye out signal was to disable the FCU and set the FCU status to "False" (see attached picture).
Remark: FCU unit will not be used for Bismuth experiment! |
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Fri May 6 10:35:06 2022, Sebastian, DAQ, laser step complete cabling changed
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I changed the laser step complete cabling from a quad coinc (see attached picture) to a Logic Fan In / Fan out (same as laser scan complete).
The "detour" through the quad coinc yielded to a very short laser step complete signal of ~500ns...
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Tue May 10 11:40:55 2022, Sebastian, Accelerator, still no beam @ESR
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There is still no Beam in the ESR.
The beam is currently at TE3 - between SIS and ESR |
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Wed May 11 23:36:24 2022, Ruijiu Chen, Carsten, Guy, DAQ, start NTCAP.
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Carrier frequency:244MHz
IQ rate: 10M Samples/seconds
Reference level: -25
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Wed May 4 22:56:22 2022, Rodolfo, Sebastian, Konstantin, Laser, Laser step complete, scan complete fixed
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"Laser step complete" and "laser scan complete" are working again.
Problems:
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Wed May 4 22:55:37 2022, Rodolfo, Sebastian, Laser, FCU / Temp Control Bug
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We found a "Bug" in the control of the Sirah dye system.
Due that we don't use the FCU and the temperature control unit we could not start the Sirah software without getting numerous errors.
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Tue May 10 15:26:35 2022, Rodolfo, Max, Laser, Laser stabilisation running
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It is now possible to stabilize and move the laser with both stages.
The software and hardware settings are attached.
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Fri Apr 29 21:18:12 2022, Rodolfo & Max, Laser, Fluorescein 27, Rh 610 + Rh 640
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We (Max and Rodolfo) have tested the dyes. I have prepared the dye-solutions according to the recipes given in Sirah's User Manual.
The seed energy for the Cobra was 520 mJ @ 532 nm. The output energy after the Cobra's main amplifier was:
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Mon May 16 21:08:48 2022, Rodolfo & Max, Laser, Laser power
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We checked the energy of the laser and optimized it a bit
[TABLE border="1"]
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Mon May 30 19:42:20 2022, Rodolfo & Kristian, Laser, Changing laser wavelength
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We have changed the laser wavelength, e.g. the dye for the Cobra to Fluorescein 27.
We get about 84 mJ out the main amplifier @ 548 nm.
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Fri Jul 30 10:21:27 2021, Rodolfo, Laser, Kink
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The laser beamline in the ESR north arc has a [B]knik[/B], therefore the laser beam can not get the "laser tower" in the north east arc. This path is used
to get the laser beam up to the electron-cooler side, such that the laser beam co-propagates the ion beam.
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Fri Apr 22 09:38:24 2022, Rodolfo, Laser, getting ready for Fluorescein548
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We are going to change dye. Therefore I have take out the DCM-dye-solution* out of the dye circulators, rinsed them with Ethanol (5 times) and put new filters.
* This was a solution of 0.3 g/l in 1:1 solvent mixture of Ethanol and DMSO. |
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Mon Apr 25 18:47:12 2022, Rodolfo, Laser, New dye circulators
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I have put into operation the new circulators (SN. 182231, 182201) for our dye laser (the Cobra). I have rinsed them with pure Ethanol first and I have
not seen any leaks.
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Mon Apr 25 21:47:28 2022, Rodolfo, Laser, green instead UV
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I am exchanging the optical elements (mirrors and lenses) for the laser spectroscopy on bismuth. At some places I am also exchanging the 3"-mirror holders
and installing 2"-mirror holders instead.
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Tue Apr 26 18:15:19 2022, Rodolfo, Detectors, XUV-Detector and Cu-Mirror
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Concerning the moveable detectors:
- I have switched off the power supply and cooling (heat exchanger) for the Cu-mirror.
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Mon May 9 13:48:20 2022, Rodolfo, Laser, Laser for H-like 209Bi
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I have changed the dye to Rhodamin 610 + Rhodamin 640. The Cobra wavelength can be tuned now from 600 to 630 nm.
The current wavelength is set to 605 nm. |