 Tue Apr 1 12:58:27 2025, Jelena B, Siddharth, General, Lassie 
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Tue Apr 1 14:02:23 2025, Jelena B, Siddharth, General, Lassie
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Tue Apr 1 14:23:01 2025, JG, General, Pleiades pocket position tests
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We started playing with the detector pockets of the pleiades arrays at 14:23 01.04.2025.
This might disturb the beam sometimes.
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Tue Apr 1 14:54:24 2025, all, General, No SIS beam since 14:35
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 Tue Apr 1 16:44:32 2025, Jeroen, Esther, General, No SIS beam since 14:35
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| Beam resumed at 16:40. |
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Tue Apr 1 22:53:59 2025, Esther, General, Lassie exports
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Tue Apr 1 23:23:18 2025, C Griffin, General, PLEIADES removed
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| Leakage currents were steadily increasing in the PLEIADES detectors so we decided to stop taking data, move both the detectors back and turn off bias. |
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Wed Apr 2 01:46:52 2025, Chris, Carlo, Zac, General, Beam loss
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HKR just called to say a power supply to the SIS18 extraction kicker has failed.
The service person has been called and is expected to take ~1h to arrive and approx. ~2h to carry out the repair. |
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Wed Apr 2 04:59:50 2025, Zac, Chris, Carlo, General, Receiving injections but not seeing anything on RSAs
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Starting at around 04:09 we don't see anything on RSAs. RSAs are still triggering and writing files, but only see noise. Lassie indicates beam current in
the ESR
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Wed Apr 2 05:48:31 2025, Chris, Carlo, Zac, General, Beam returned
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Beam was returned to the ESR at 05:11.
HKR said there had been some problem with one of the dipoles and in order to restore it a power supply had to be reset, which took some time.
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Wed Apr 2 07:25:15 2025, Carlo, Chris, Alex, Michael , General, Beam back
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| 07:20 we have beam back. |
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Wed Apr 2 07:33:59 2025, Michael, Alex, General, Beam gone again
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| 7:29, beam gone again, operators say they need another 5 minutes. |
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Wed Apr 2 07:39:41 2025, Michael, Alex, General, The beam is back at 07:35
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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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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 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 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 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 17:06:45 2025, ID, HA et al, General, Lassie screenshots
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Wed Apr 2 18:13:20 2025, ID, HA, General, RSA spectra
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