| ID |
Date |
Author |
Category |
Subject |
|
26
|
Tue May 10 11:40:55 2022 |
Sebastian | Accelerator | still no beam @ESR |
There is still no Beam in the ESR.
The beam is currently at TE3 - between SIS and ESR |
|
30
|
Tue May 10 21:41:17 2022 |
Rodolfo | Accelerator | T-Scraper |
The T-Scrapers at the electron cooler have an issue. They can't be moved in the horizontal direction using the DeviceControl. |
|
33
|
Tue May 10 23:10:25 2022 |
Sebastian, Patrick, Volker, Guy | Accelerator | T-Scraper Reloaded |
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. |
|
47
|
Wed May 11 20:47:54 2022 |
Zoran | Accelerator | beam lost in SIS |
For some reason the beam was lost in the SIS soon after taking the ESR beam this evening, reason unknown. Solved by sending teh full context to the SIS machine and having
operators to manually set the voltage of the SIS extraction kicker. Afterwards a slight readjustment of the transfer beamline was necessary:
In the SIS: GTE5 KY1, MU0, QD21, QD22 as well as in the ESR: GE01MU4I (5 -> 6 mrad)
This brought back around 1E7 particle in the ESR after 5 accumulated SIS injections. |
|
64
|
Thu May 12 15:50:33 2022 |
Max | Accelerator | No ESR beam |
Since 13:30 we have no beam in the ESR. There is a problem with the ESR septum.
The magnets department is investigating. |
|
65
|
Thu May 12 16:35:17 2022 |
Max, Wilfried, Zoran | Accelerator | NO BEAM UNTIL TOMORROW MORNING |
The problem at the ESR septum is serious. They have to remove the broken part and try to repair it.
Maybe tomorrow in the morning briefing there will be more information about this.
The night shift will not take place!
The morning shift starts at 9:00 or on further notice!
The PMTs are switched off and the laser also. |
|
66
|
Fri May 13 08:32:41 2022 |
Zoran | Accelerator | NO BEAM UNTIL TOMORROW MORNING |
> The problem at the ESR septum is serious. They have to remove the broken part and try to repair it.
> Maybe tomorrow in the morning briefing there will be more information about this.
>
> The night shift will not take place!
> The morning shift starts at 9:00 or on further notice!
>
> The PMTs are switched off and the laser also.
Update from the morning briefing: the DCCT (power converter) of the injection septum was demounted and the EPS group is trying to fix it. There is no replacement available, so if they do not succeed this beamtime is over. They promised more information in the midday meeting at 12:45.
In the ESR Messhüte is some cake ("Trostkuchen"). |
|
79
|
Tue May 17 06:37:28 2022 |
YL, KM | Accelerator | Reduced beam intensity |
The resonance in 209Bi has been seen during the night.
Reducing the intensity by a factor~1000, to simulate 208Bi conditions
Running low intensity since ~6:15-6:20
The present intensity is so low that DCCT does not see the beam.
On Schottky the beam is clearly seen as ~30-40 dB over the background.
The real intensity is to be determined from the NTCap, which is running (checked). |
|
93
|
Mon May 30 20:58:26 2022 |
Carsten | Accelerator | New Settings for 208Bi Beam |
Old SetParameters.C and old SetConditions.C were saved as SetParameters_209.C and SetConditions_209.C
The ion beam settings were changed to 208Bi82+:
SIS energy now: 554.6 MeV/u (was 551MeV/u) + 3.6MeV/u
Cooling voltages were increased by 1830V, i.e.
Delta U SC3: 1990V
DeltaU SC6 / SC9 : 1960V ???
The new frequency is 1.99236615 MHz
DD2AG xx
DD2IG xx
DD2_G xx
DS3_HG xx
SIS intensity is still only about 1e8 |
|
102
|
Tue May 31 19:59:49 2022 |
Carsten, Danyal | Accelerator | change in frequency mismatch 208Bi --> 209Bi |
time = 20:00
The RF has been adjusted so that it bunches at the correct frequency for 209Bi
For 208Bi the settings ("frequency mismatch") were:
-0.102 in SC5
-0,102 in SC11
For 209Bi the settings ("frequency mismatch") are (and were yesterday):
-0.83 in SC5
-0,83 in SC11 |
|
67
|
Fri May 13 11:46:51 2022 |
Sebastian, Simon | | Laser energy |
We (Sebastian and I) measured the output energy of the laser system again.
All values in [mJ] and over 500 laser-pulses average
|
Date | Out of Quanta Ray @ 532 nm | Seed energy for Cobra @ 532 nm | Out of Cobra @ 601 nm
| |
10.05.2022 | 533 | 485 | 71
| |
11.05.2022 | 484 | 480 | 67
| |
12.05.2022 | 578 | 501 | 75
| |
13.05.2022 | 632 | 498 | 78
|
The lambda/2 is at 100°. Correction factor for the 532nm-monitor is 8.4. |