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ID Dateup Author Category Subject
  226   Thu Apr 14 08:41:42 2022 CarstenAcceleratorLow intensity at the experiment after series of failures during the night
After the recovery from the failures during the night, we see much lower intensity at the experiment (measured with the particle detector count rate).
Instead of 8000-10000 cts we see only 3000-4000cts at comparable SIS intensities.
Also ESR cooler seems to be slightly unstable (wiggling lines) during injection. However, it is visually evident from the Schottky that the injected intensity already is much lower than yesterday evening.

All devices in ESR are (seem to run ) runnng properly, and also slit position (PN devices) are ok.

I am going to open the slits iin the SIS ESR transfer beamline. It would be useful to check for the SIS-ESR timing.
  227   Thu Apr 14 10:57:11 2022 CarstenAcceleratorMaintanence UNILAC / Op training
We had no beam since about 1000. Also, we are still trying to find out why we have such a low intensity in the expereimnt.
Presently, there is a planned maintenance in the UNILAC, beam is expected back in 25-30 mins.
The profile grid TE3 in the transfer beamline in front of the target will be used to check if the extracted SIS beam has changed compared to before the crash of the SIS.
All devices in the ESR seem to work normally including ramping of cooler current/voltage, dipole correction windings and sextupoles (all checked).
As we observed that coolng performace after injection is much worse Markus (Steck) suggested that we could try a longer manual cooling in machine 3 (pleae no cahnges in timimng) to see whether the SIS energy has changed (similar to about 1 week ago).
Cooler elctron current iis put back to 450ma (inejection / 40mA measurement).
  228   Thu Apr 14 12:27:18 2022 Sebastian, MaxDetectorsConnection to XUV / Cu reestablished!
The connection to the XUV and Cu were lost during the nightshift.

The XUV detector was in the park position,
BUT the Cu mirror was in the "Measurement position" (moved in / active).

This could be one of the main problems that we had much lesser ion beam intensity since the UNILAC and SIS18 failures last night.
  229   Thu Apr 14 12:38:38 2022 SebastianDetectorsXUV / Cu checkups
Check regularly if the connection to the XUV and Cu detectors are still active and the detectors move in (after injection) and out (after killing the ion beam). 

Therefore, 2 programs should run on the computer where you can also see the running Schottky.

One of the programs is for the XUV and one is for the Cu mirror.
There the Automisation button should be activated!!!

ID 30 contains the manual how to run / start and operate both detectors.
  230   Thu Apr 14 17:47:55 2022 Carsten, Rodolfo, Konstantin, SarperRunsAfternoon shift runs 14.04 changing the wavelength scan range
The new scan range is changed from 321.12 - 320.60 nm to 320.62 - 320.10 nm

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
18:36 9.5e8 209618 0301 8014 320.62 - 320.10 0.002 5s 6270
19:45 9.4e8 209615 0302 8015 320.62 - 320.10 0.002 5s 5400
20:44 8.4e8 209618 0303 8016 320.62 - 320.10 0.002 5s 4210
21:37 8.9e8 209616 0304 8017 320.62 - 320.10 0.002 5s 4550
  231   Thu Apr 14 19:46:46 2022 Sarper & Konstantin & RodolfoLaserLaser power
We checked the laser power before starting the new scan range.

- Seed energy before Cobra @ 532 nm: 513 mJ (before 499 mJ).
- New correction factor for Monitor: 71.25.
- UV output energy after SHG @ 320.1 nm: 11 mJ

All values are averaged over 500 laser pulses.
  232   Thu Apr 14 22:44:40 2022 Patrick, Simon, Danyal, MaxRunsRuns night shift 14./15.04.
Runs of the night shift. The wavelength range is 320.62 - 320.10 nm.

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
22:38 9.5e8 209621 0305 8018 320.62 - 320.10 0.002 5s 5000 laser scan was started 1 min late
23:38 9.8e8 209622 0306 8019 320.62 - 320.10 0.002 5s 5550
00:32 1.0e9 209621 0307 8020 320.62 - 320.10 0.002 5s 4000 After ~4000 counted particles (second scan, 1:04 am) the e-cooler went off.
01:21 1.1e9 209622 0308 8021 320.62 - 320.10 0.002 5s 6700
02:12 1.2e9 209623 0309 8022 320.62 - 320.10 0.002 5s 6400
03:03 1.1e9 209624 0310 8023 320.62 - 320.10 0.002 5s 5500
03:55 1.3e9 209622 0311 8024 320.62 - 320.10 0.002 5s 7700
04:47 1.2e9 209622 0312 8025 320.62 - 320.10 0.002 5s 5300
05:36 1.2e9 209620 0313 8026 320.62 - 320.10 0.002 5s 6666
06:25 1.2e9 209619 0314 8027 320.62 - 320.10 0.002 5s 6500 change of shift crew (Danyal & Max)
07:16 1.2e9 209618 0315 8028 320.62 - 320.10 0.002 5s 5230
08:13 1.2e9 209620 0316 8029 320.62 - 320.10 0.002 5s 6600
09:04 1.1e9 209619 0317 8030 320.62 - 320.10 0.002 5s 6660
09:54 1.2e9 209619 0318 8031 320.62 - 320.10 0.002 5s 5950
10:49 1.1e9 209619 0319 8032 320.62 - 320.10 0.002 5s 6580
11:38 1.1e9 209617 0320 8033 320.62 - 320.10 0.002 5s 5380
  233   Fri Apr 15 12:42:18 2022 Max, Danyal, Carsten, Konstantin, Patrick, SimonGenerallaser wavelength range changed: 320.12 - 319.60 nm

Runs of the morning/afternoon/night shift. The wavelength range is now 320.12 - 319.60 nm.

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
12:51 1.2e9 209617 0321 8034 320.12 - 319.60 0.002 5s 5530 ERS Trafo 1.25e7 --> 1.2e9
13:43 1.2e9 209617 0322 8035 320.12 - 319.60 0.002 5s 6408 at 13:49 there was a short broadening of the ion beam in the Schottky spectrum
14:35 1.16e9 209618 0323 8036 320.12 - 319.60 0.002 5s 6585
15:30 1.08e9 209617 0324 8037 320.12 - 319.60 0.002 5s 5701
16:20 1.10e9 209617 0325 8038 320.12 - 319.60 0.002 5s 5470
17:11 1.11e9 209617 0326 8039 320.12 - 319.60 0.002 5s 5519
18:00 1.08e9 209616 0327 8040 320.12 - 319.60 0.002 5s 5402 Ecooler voltage suddenly jumped to 109619 around 18:30. Laser spot seems to drift slowly to an inner position (left on the screen). This might be due to an interplay between a decreasing laser power and the position sensitive detectors of the beam stabilization.
18:52 1.16e9 209620 0328 8041 320.12 - 319.60 0.002 5s 6948
20:39 1.13e9 209619 0329 8042 320.12 - 319.60 0.002 5s 6xxx Dye was changed before this run was started
20:32 1.20e9 209620 0330 8043 320.12 - 319.60 0.002 5s 6948
22:25 1.21e9 209619 0331 8044 320.12 - 319.60 0.002 5s 7120 Night shift took over (Patrick, Simon)
23:15 1.26e9 209619 0332 8045 320.12 - 319.60 0.002 5s 7080
00:06 1.25e9 209616 0333 8046 320.12 - 319.60 0.002 5s 6500
00:59 1.23e9 209616 0334 8047 320.12 - 319.60 0.002 5s 5380
01:50 1.30e9 209616 0335 8048 320.12 - 319.60 0.002 5s 6750
02:41 1.38e9 209616 0336 8049 320.12 - 319.60 0.002 5s 6970
03:32 1.37e9 209616 0337 8050 320.12 - 319.60 0.002 5s 7010
Attachment 1: VoltageJump1830.PNG
VoltageJump1830.PNG
  234   Fri Apr 15 12:53:25 2022 Max, DanyalLaserchecked laser pulse energy after change in wavelength range
previous scan range:
the laser pulse energy @ 320.62 nm was ~11 mJ

new scan range:
the laser pulse energy @ 320.12 nm was ~11 mJ
the laser pulse energy @ 319.60 nm was ~10 mJ
  235   Fri Apr 15 20:43:18 2022 KonstantinLaserDye changed
Dye of the laser system has been changed. UV laser power increased from ~8 mJ to 11 mJ pulse energy.
  236   Sat Apr 16 04:19:05 2022 Patrick, Simon, Alex, SarperRunsRuns night + morning shifts 16.04.
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 to go with 262 scans after the first run.


TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
04:24 1.28e9 209616 0338 8051 320.12 - 319.86 0.001 5s 6750 This run had only 260 scans
05:18 1.20e9 209615 0339 8052 320.12 - 319.859 0.001 5s 6300 First run with 262 scans
06:09 1.36e9 209615 0340 8053 320.12 - 319.859 0.001 5s 6910 laser scan started 2 min late at 650 counts
07:03 1.24e9 209615 0341 8054 320.12 - 319.859 0.001 5s 6330
07:59 1.23e9 209615 0342 8055 320.12 - 319.859 0.001 5s 5712
08:51 1.1e9 209615 0343 8056 320.12 - 319.859 0.001 5s 4380
09:44 1.28e9 209615 0344 8057 320.12 - 319.859 0.001 5s 5135
10:39 1.25e9 209615 0345 8058 320.12 - 319.859 0.001 5s 5860
11:30 1.2e9 209615 0346 8059 320.12 - 319.859 0.001 5s 6500
12:22 1.23e9 209618 0347 8060 322.41 - 322.00 0.002 5s 5200 Laser wavelength scan range is changed to 322.41 - 322.00 nm and increment to 0.002 nm.
13:04 1.2e9 209616 0348 8061 322.41 - 322.00 0.002 5s 4411
13:50 1.2e9 209616 0349-0351 8062-8063 322.41 - 322.00 0.002 5s 10651 last scan / 10 loops ~ 3 hours of scan -- Ecooler failed, realized at 16:05 we were on loop8, laser is turned off at 16:10
  237   Wed Apr 20 10:09:50 2022 RodolfoLaserOptic with spots
The average energy produced by the laser along the beamtime was about 10 mJ/puls. After about two weeks of beamtime some of the optics, especially the optic placed just after the BBO crystall, got some spots, see pictures below. Here the diameter of the laser beam is about 6 mm.
Attachment 1: SHG_Compensator_mitFleck_19-04-2022.jpg
SHG_Compensator_mitFleck_19-04-2022.jpg
Attachment 2: UV_Umlenkspiegel_mitFleck_19-04-2022.jpg
UV_Umlenkspiegel_mitFleck_19-04-2022.jpg
  84   Tue Mar 25 06:22:10 110 Ken UeberholzDetectorsXUV-Detector Rates
Count rates were measured for the XUV-
detector for a full circle:
Cathode: -5V, shields: 0V, main coil 8A, 
sec coil 2A, 
No beam - pos 0mm: ~10 Hz
Hot beam - pos 0mm: ~5 kHZ
Cool beam - pos 147mm: ~200Hz
Attachment 1: Screenshot_20220404-000343_Gallery.jpg
Screenshot_20220404-000343_Gallery.jpg
Attachment 2: Screenshot_20220404-000327_Gallery.jpg
Screenshot_20220404-000327_Gallery.jpg
Attachment 3: Screenshot_20220404-000411_Gallery.jpg
Screenshot_20220404-000411_Gallery.jpg
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