 Fri May 7 22:00:36 2021, Chris, Accelerator, brief beam loss
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| Brief interruption in beam, ~21:42-21:51. |
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Fri May 7 23:08:44 2021, Michael, Kanika, Accelerator, Beam issues for short duration
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| The beam was lost for a few minutes from 23:01 to 23:06. It is back now. |
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Sat May 8 01:43:23 2021, Helmut Weick, Accelerator, 70Se setting
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If gamma_t = 1.3955 Tm stays, we will need Brho = 6.21902 Tm for 70Se.
The corresponding ESR Brho setting will be a bit shifted.
It then requires E-SIS = 446.55 MeV/u to get 70Se to this Brho and gamma_t.
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Sat May 8 08:44:32 2021, Akash, Nic, Jelena, Zsolt, Accelerator, No Beam!
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08.43am: Beam stopped. HKR looking into it. Reason: they mentioned they don't know yet!
10.10am: SIS resumed operations. However, there are some issues with magnet power supplies for ESR and hence we still don't have beam. HKR member went |
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Sat May 8 11:42:21 2021, Yuri, Accelerator, KPs
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EO1KP03 was on = -44.9 A
E01KP05 was off, now is on = 3.67 A
The beam is on the right frequency, but the width is still very broad. |
Sat May 8 16:08:58 2021, Helmut Weick, Accelerator, beam position of Kr before ESR 
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Checked beam positions in beamline before ESR,
they all look the same as before, with direct Kr beam.
Compare with old elog entry #.
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Sat May 8 21:08:13 2021, Helmut, Sergey, Shahab, Wolfram, Yuri, Accelerator, optimisation of sextuples
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| The optimisation of sextuples is finished. Record a few files. |
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Sat May 8 21:42:51 2021, All, Accelerator, Set up for 52Mn
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Details will follow
E(Mn) = 368.41 MeV/u |
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Sun May 9 01:19:47 2021, Helmut, Sergey, Accelerator, scraper optmisation for 72Ge
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To improve the isochronicity still in the 72Ge setting sextupoles and scrapers wer varies successfully.
1. E02DS_H -130 / 130mm - wide rect. peak
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Sun May 9 01:49:25 2021, Helmut, Sergey, Yuri, Accelerator, change to 52Mn
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It was done in steps:
isochronous 52Mn should come at Brho = 6.28239 Tm (gamma_t = 1.3955).
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Sun May 9 14:19:44 2021, Yuri, Accelerator, Spectrum
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We accept larger m/q values than we like to. m/q(low) cut ~ 2.08. Decrease ESR energy from 369.2 -> 368.4 MeV/u
frequencies shifted by -37.5 kHz (at 60 MHz) |
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Sun May 9 18:50:23 2021, Helmut, Wolfram, Yuri, Accelerator, changed to 70Se
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18:45 changed SIS, ESR setting for 70Se without predrilling blind change.
E-SIS = 446.55 MeV/u, is centerd as before on TE3UF target grid.
set beamline after taret as 78Kr 36+ E = 337.375 MeV/u
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Sun May 9 21:29:26 2021, Helmut, Wolfram, Yuri, Accelerator, target TE3UF shift
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We see a very strong line at the left end of spectrum, stronger than all other lines.
When we shift the target TE3UF_H from -35mm to -37mm it gete weaker, but -37mm is the end of drive.
In the other direction it becomes worse. At -25mm completely new peaks.
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Sun May 9 22:31:23 2021, Helmut, Wolfram, Yuri, Accelerator, change to 72Ge
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we change back to 72Ge
just change SIS-energy E = 441.0 MeV/u
beamline energy after target E = 392.9 MeV/u
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Sun May 9 23:24:49 2021, Helmut, Wolfram, Yuri, Accelerator, scraper optmisation for 72Ge
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We tried the scrapers a bit, because right of peak some background appeared.
The GE01DS_HI shows a strange effect,
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Sun May 9 23:32:24 2021, Helmut, Accelerator, parammodi saves 8x
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Here are parammodi saves for TE-line and ESR for all four fragment settings:
For the first run of 72Ge (7.May) I do not have files.
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Mon May 10 00:41:20 2021, Chris C, Accelerator, no beam
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Beam gone ~0:34.
Working on getting it back.
Back in business ~0:57. |
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Thu Jun 24 22:05:11 2021, Helmut Weick, Accelerator, LISE files for 72Ge, 70Se, 52Mn settings
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This is just a Brho selection by the ESR based on SIS-energy used,
energy-loss in target with calibrated thickness and momentum spread by the reaction (Goldhaber formula).
Production cross sections are by EPAX 3.1 |
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Tue Jun 29 10:32:10 2021, Sergey, Helmut, Accelerator, cooler curves for tuning of isochronicity
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Variation of quadrupole E01QS03D to change gamma_t in isoc. mode
measured with 78Kr at 368.5 MeV/u on 28.06.2021 evening.
The shape of the three curves looks very similar they would only require a different beam velocity.
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Tue Jun 29 20:13:58 2021, Helmut, Sergey, Yuri, Accelerator, change to predrilling an 72Ge
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After optimisation of sextupoles we found a scraper position which makes a narrow peak and keeps 20% of the injected beam.
GEEXDS2HA = +2.0 mm (out is +130mm)
GE01DS_HI = -75 mm (out is -130mm)
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