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  masses & isomeres 2025, Page 16 of 17  Not logged in ELOG logo
New entries since:Thu Jan 1 01:00:00 1970
ID Date Author Categorydown Subject
  312   Tue Apr 8 12:08:56 2025 siddharthAnalysisSigma vs Mean Freq. Plot for 188Hf72+ setting 2
This is sigma vs Freq plot for 188Hf72+ made out of 1hr of injections post Saturday, April 5th. 
The 2nd photo Compares the resolution of 188Hf setting by looking at peaks of 205Au and 205Pb which are very close in frequency range. The resolution in the second 188Hf72+ setting(on Right) seems much better as two peaks can be seen clearly. 
  319   Tue Apr 8 20:50:59 2025 Ruijiu ChenAnalysisPID of 204Pt77+
  11   Mon Mar 31 20:42:38 2025 H. Weick, S. LitvinovAcceleratorfragment setting, E-SIS
~ 20:00 changed E-SIS to 524.0 MeV/u to get 194Pb at the Brho of the primary beam before (=7.2008 Tm).
which corresponds to gamma = 1.400 for 194Pb82+. 
Before it was E-SIS = 480.5 MeV/u after Be-1839 mg/m^2 target Brho = 7.2014 Tm.
Keep target and beamlines and ESR the same, only SIS and TE-line before target is changed.
  17   Tue Apr 1 02:01:06 2025 Zac, Shahab, Ruijiu, Yuri, Sergey, Wolfram, Carlo, MichaelAcceleratorSettings lost
Settings lost after the beam was lost. Trying to recover particle identification now that beam has returned.
  20   Tue Apr 1 02:37:28 2025 H. Weick, S. LitvinovAcceleratorIsoc-setting +scrapers
First a setting with orbit bump for injection on central orbit was tried.
- quadrupoles tuned and scrapers optimized

Then back to an ESR setting without this bump like last year.
- again quadrupoles tuned and scrapers optimized
This gave a good resolution in which the isomer should be resolved.

Just after this was achieved all resolution was lost.
Making the input for ESR setting again recovered it, now with slightly different scrapers.

Quads: K'L Q3D / Q6D = -0.3603263
Sext: K''L GE01KS2 = -0.14
           GE01KS3 =  0.05

scrapers: GEEXDS1HA =  -5 mm
          GE01DS3HG = -70 mm 

Details see paper scans below.
  47   Tue Apr 1 20:00:14 2025 Jeroen, Zac, EstherAcceleratorBeam fell out
No beam from 19:57:41.
  48   Tue Apr 1 20:02:19 2025 Jeroen, Zac, EstherAcceleratorBeam fell out
> No beam from 19:57:41.

Beam back from 20:02
  49   Tue Apr 1 20:19:23 2025 Jeroen, Zac, EstherAcceleratorBeam fell out
> > No beam from 19:57:41.
> 
> Beam back from 20:02
  59   Wed Apr 2 00:59:43 2025 Zac, Carlo, ChrisAcceleratorLost the beam
Beam was lost from 00:44 until 00:59
  73   Wed Apr 2 10:02:40 2025 Sergey + YuriAcceleratorESR Timeout
At around 9:40, ESR timeout changed from 10 s to 30 s
Triggering only on real injections.
Before that, every second injection was not real but the old one. They can be identified since they should have no "kicker" disturbance.
  74   Wed Apr 2 10:05:06 2025 Michael, Alex, YuriAcceleratorNo beam since 09:59
The SIS kicker has failed again.
  75   Wed Apr 2 10:31:15 2025 Michael, AlexAcceleratorThe beam is back from 10:10
  76   Wed Apr 2 10:55:16 2025 Michael, Alex, WolframAcceleratorNo beam in the ESR
Since few minutes do not see any beam in the ESR (on RSAs). There is beam in SIS and injection requests from the ESR seem to be there as well.
  77   Wed Apr 2 11:09:42 2025 Michael, AlexAcceleratorThe beam is back in the ESR
We have the beam again the ESR since around 11:00.
The Schottky spectra look the same as before.
The ESR experts could not exactly identify the problem which caused this loss of the beam.
  78   Wed Apr 2 12:13:57 2025 Michael, AlexAcceleratorSome empty injections triggered while beam patterns are changed
Operators seem to play with spill cycles, we get every 1:1 shot, then 1:10 again. During this, we noticed a few "empty injections" beeing triggered in the RSAs. They light up green, but spectrum is flat. Then it returns to normal operation again.
  80   Wed Apr 2 13:27:52 2025 Michael, Alex, MaeveAcceleratorNo beam in the ESR
There is no beam in the ESR since couple of minutes. According to the info from HKR, the experts started to repair the magnets (power supplies) used for extraction and transfer of the beam from SIS to ESR. It is estimated to take about 1 hour.
  82   Wed Apr 2 15:07:52 2025 Michael, Alex, MaeveAcceleratorStill not a good beam in the ESR
The (power supply of) SIS kicker magnet has been repaired and the beam has been restored from about 14:20.
But, the Schottky spectrum in the ESR looked pretty bad, so the measurement can not be restarted. 
The accelerator experts are currently looking into this problem.
  96   Wed Apr 2 23:15:52 2025 Zac, JohanAcceleratorNo injections from SIS
Night shift starts with no injections from SIS! We still have triggers; we called HKR and are waiting for response.
  97   Wed Apr 2 23:27:35 2025 Zac, JohanAcceleratorBeam is back 23:25
  98   Wed Apr 2 23:33:43 2025 ZacAcceleratorBeam is gone at 23:29
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