 Wed Apr 2 18:15:06 2025, ID, HA, MW, General, Lassie screenshots 
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Wed Apr 2 18:13:20 2025, ID, HA, General, RSA spectra
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Wed Apr 2 17:46:12 2025, Ruijiu, Wolfram, Xinliang, Wangqian, Analysis, The spectrum of 194Pb82+ vs 184Pt78+
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In summary, the statistical results collected between 5:00 and 12:00 AM on April 2, 2025. For each injection, we calculate the frequency mean value
(f_mean) and the peak height (P) of 194Pb ions for frames with t > 0.14 s, correct each injection’s frequency by subtracting f_mean, and only sum
the
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Wed Apr 2 17:06:45 2025, ID, HA et al, General, Lassie screenshots
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Wed Apr 2 16:28:14 2025, SS, ID, HA etc, DAQ, NTCAP stop/start
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| NTCAP was stopped and restarted. |
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Wed Apr 2 15:46:24 2025, ID, HA,MW, General, Beam back in ESR,
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| beam is back, we started DAQ again. All files created after 15:45 should be good from now on. |
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Wed Apr 2 15:07:52 2025, Michael, Alex, Maeve, Accelerator, Still not a good beam in the ESR
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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. |
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Wed Apr 2 13:35:17 2025, Michael, Alex, Maeve, DAQ, RSAs data taking
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| Since there will be no beam for about one hour, the data taking in RSAs has been stopped. |
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Wed Apr 2 13:27:52 2025, Michael, Alex, Maeve, Accelerator, No beam in the ESR
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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. |
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Wed Apr 2 12:58:15 2025, Ruijiu, Wolfram, Analysis, frequency drift
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Wed Apr 2 12:13:57 2025, Michael, Alex, Accelerator, Some empty injections triggered while beam patterns are changed
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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. |
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Wed Apr 2 11:09:42 2025, Michael, Alex, Accelerator, The beam is back in the ESR
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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. |
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Wed Apr 2 10:55:16 2025, Michael, Alex, Wolfram, Accelerator, No beam in the ESR
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| 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. |
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Wed Apr 2 10:31:15 2025, Michael, Alex, Accelerator, The beam is back from 10:10
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Wed Apr 2 10:05:06 2025, Michael, Alex, Yuri, Accelerator, No beam since 09:59
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| The SIS kicker has failed again. |
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Wed Apr 2 10:02:40 2025, Sergey + Yuri, Accelerator, ESR Timeout
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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. |
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Wed Apr 2 09:28:59 2025, Michael, Alex, General, Empty injections in the ESR
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Since the FRS started to take the beam again, the ESR gets 1/10 shots from SIS. But, the ESR seems to request about twice more frequently the beam from
SIS which means that every second shot in the ESR is empty (it contains the remaining beam from the previous injection). This also applies to the data
stored by RSAs because they also (seem to) trigger each time the ESR requests the beam. |
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Wed Apr 2 08:47:27 2025, Michael, Alex, General, The beam is back
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The beam is back. But, the experts have found a problem with one of the modules of the SIS kicker magnet. And, currently they have disabled this module.
This fixed the problem. However, since the kicker system is not running with full power, it is not clear by how much this can affect the extracted beam
intensity for the ESR. Therefore, the ESR experts have been called and they will look at the injected beam intensity in the ring, in order to know if |
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Wed Apr 2 08:04:47 2025, Michael, Alex, General, No beam
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The SIS kicker has failed again at 08:01.
Since this has happened already few times, the experts from the on-call duty service are now looking at the problem. |
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Wed Apr 2 07:41:10 2025, Michael, Alex, General, Frequency shift in Schottky
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After the beam was restored at 07:25, we think that the frequency peak in the 244 MHz RSA2 has jumped again (closer to the center).
Previous to that, during the longer break in the previous night, the peak jumped to higher frequencies. |
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