 Mon Jun 23 18:36:39 2025, Wilfried, Simon, Detectors, PMT test with LED
|
We tested the PMTs again, this time with an UV LED that is mounted at a window close to the XUV detector.
PMT south showed a very clear increase in count rate from about 1 to 50 Hz.
PMT mid also showed a small increase by a few Hz.
|
|
Fri Jun 20 15:58:21 2025, Wilfried, Konstantin, Simon, Laser, Laser stepwidth
|
From previous Bi-Beamtimes, we expect the width of the transition to be >50GHz (FWHM). The current step width is 0.002nm which corresponds to 8GHz, so the
laser would be in resonance for 6 steps.
We should aim for at least 5 steps in resonance.
|
|
Sat Jun 28 06:29:58 2025, Stefan, Simon, Konstantin, Runs, Morning shift 28.06.
|
6:30 Problem with ion source, on-call service is called
7:30 There is a short in the ion source and it needs to be changed. Expected down time about 2h
10:30 Ion source was successfully changed, but while ramping up the source a power supply failed. Next on-call service is on their way to GSI.
|
|
Sun Jun 29 06:11:49 2025, Stefan, Konstantin, Runs, Morning Shift 29.06.
|
[TABLE border="1"]
|
|
Wed Jun 4 16:17:47 2025, Simon, Detectors, Nitrogen
|
| The nitrogen supply for the PMTs is turned [B]ON[/B]. |
Tue May 20 16:14:30 2025, Rodolfo, Simon, Detectors, PMT arrangement at ESR 
|
This is the arrangement of the photomultipiers at the optical detection region at ESR for Thorium 2025
|
 Wed Jun 4 16:18:57 2025, Rodolfo, Simon, Detectors, PMT dark count rates
|
I adjusted the offsets of the amplifiers in the cave and measured the dark count rates :
[TABLE border="1"]
|
|
Fri Jun 6 14:27:10 2025, Rodolfo, Konstantin, Laser, MRC Beam Stabilization Presettings
|
These are the settings for the Beam Stabilization from MRC.
Laser-beam energy ca. 18 mJ @ 275 nm |
|
Sat Jun 21 03:06:19 2025, Rodolfo, Alex, Hiroshi, Anton, Laser, beam overlap with t-scrapers
|
[TABLE border="1"]
motor|ion beam position (mm) from outside|ion beam position (mm) from inside
|-
|
|
Tue Jun 17 19:25:30 2025, Rodolfo, Accelerator, T-Scrapers in E-Cooler
|
Here are the instructions to drive the T-Scrapers inside the ESR Electron Cooler
[LIST]
|
|
Wed Jun 18 03:12:25 2025, Rodolfo, Laser, Beam Stabilization
|
The laser beam pointing has changed, even thought the MRC settings are the same as given in Entry 5 (this elog). This could be caused by a droping of the
laser output energy which is now 13,8 mJ @275 nm |
|
Sat Jun 21 00:23:22 2025, Rodolfo, Laser, Dye
|
| I have prepared new (fresh) dye solutions of Fluorescein 27: 2 charges. They are in the Safety Cabinet (Sicherheitsschrank) in the ESR Laser lab |
|
Wed Jun 25 05:53:54 2025, Rodolfo, Laser, FCU
|
| Cobra's FCU was recalibrated. Table saved as FCU_547-554_RS_2024-06-25.fcu. |
|
Sat Jun 21 21:55:18 2025, Peter, Danyal, Marek, Detectors, PMT rates
|
We have made two foam rings (outer diameter ca. 70 mm with a thickness of 10 mm each and placed them successively underneath PMT north.
ring 1: ID = 55 mm
|
|
Sat Jun 21 22:33:04 2025, Peter , Danyal, Detectors, PMTs are switched off
|
| We have switched off all 3 PMTs ! |
|
Fri Jun 27 14:23:39 2025, Nils, Wilfried, Carsten, Julian, Runs, Runs afternoon shift 27.06.
|
15:30 We have a break due to an issue at UNILAC (quadrupole failed). Also radiation safety interlock was triggered at the fragment separator. This also
pushed a faradaycup into the ESR (GE01DC3VP).
Just before the issue during the last bunching, the peak was misaligned to the marker in the Schottky. The marker was sitting on the right flank. So the |
|
Sun Jun 29 03:03:56 2025, Nadine, Finn, Runs, Night shift runs with laser
|
around 22:00 water cooling circuit failure of ESR electron cooler--> ~1h downtime
Wavemeter frequently overexposed around 549,3nm; other wavelengths are fine
|
|
Wed Jun 11 11:20:23 2025, Konstantin, Simon, DAQ, octal gate generator delays
|
We checked the set delays of the OG 8000 octal gate generator and compared them with the values measured before the Bi-beamtime (see [URL=https://elog.gsi.de/esr/E0038/34]entry
34[/URL]).
All values match within an uncertainty of <1ns
|
|
Fri Jun 13 18:14:02 2025, Konstantin, Carsten, DAQ, DAQ Folder
|
Dryrun of DAQs. Folders of the data are:
|
|
Mon Jun 16 07:26:01 2025, Konstantin, DAQ, Startup of Medusa and DAQ1
|
The laser control software (Medusa) is hosted on the Windows PC ATPPC023. First connect via the command
atplaser@lxg1297:~$ [B]xfreerdp /w:2500 /h:1400 /u:atplaser /v:atppc023.campus.gsi.de[/B]
|