 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 16:28:14 2022, Carsten, DAQ, Cable of Bunch HF disconnected and 1.995Mhz signal connected for DAQ tests
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| see subject. |
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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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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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Wed May 4 22:45:12 2022, Carsten, Sebastian, DAQ, Q-Switch Signal (ch15) fixed
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The "dead" Q-Switch signal was converted
two times... This explains why in the
Thorium experiment the Q-Switch signal
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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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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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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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Fri May 6 16:29:03 2022, Simon, Patrick, Detectors, PMT preparation
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We changed PMT north and PMT south and tested them at 1500 V.
Both new PMTs are broadband.
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Fri May 6 16:41:57 2022, Patrick, Rodolfo, Laser, Wavemeter
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We coupled the laser through a multi-mode fiber into the wavemeter.
With the main amplifier enabled, we got enough power behind the fiber (0.5 - 1.5 mW) to use the wavemeter with 34 ms exposure time (1s / 30Hz to prevent
jumps in the wavemeter readout).
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Mon May 9 09:43:08 2022, Zoran, Accelerator, ESR Beam
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The main control room started setting up the Bi beam this morning, but quickly stopped in order to solve some problems around the UNILAC. Therefore we
should not plan to receive ions earlier than late in the evening on Monday, or probably Tuesday during the day. |
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Mon May 9 11:45:57 2022, Wilfried, Jon, Sebastian, General, HV Divider position & DMM calibration
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We performed an autocalibration (attached picture 1) of the Keysight 34465A DMM (TUD Keysight).
The position and the "cabling" to the cooler platform was also adjusted (picture 2,3). |
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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. |
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Mon May 9 16:58:41 2022, Carsten, Detectors, Voltage particle dectectors NA_SZ und SA_SZ switched on
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Voltage SA_SZ (capture behind cooler): 1500 V (thin plastic scintillator)
Voltage NA_SZ (capture behind target): 750V (thick plastic, short absorption length)
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Mon May 9 17:01:02 2022, Carsten, DAQ, directories / paths / comments / reduction factors /startup.scom files for the 2 DAQs
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[U][B]DAQ1 (original):[/B][/U]
-user atplaser
-runs on lxg1050
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