 Wed Apr 2 07:39:41 2025, Michael, Alex, General, The beam is back at 07:35
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Wed Apr 2 07:33:59 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 07:25:15 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 07:16:33 2025, Carlo, Chris, Alex, Michael, DAQ, ESR not requesting
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7:05 ESR not requesting new pulses from the SIS.
Operators are trying to fix the problem.
7:20 eam is back |
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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.
05:41 data are back in the RSAs. Files that contain data from:
RSA01-2025.04.02.05.41.14.938.tiq_spectrogram.npz
to:
RSA01-2025.04.02.06.24.01.530.tiq_spectrogram.npz
06:24 data not visible again, only noise.
06:43 data are ack in the RSAs. Files that contain data from:
RSA01-2025.04.02.06.43.43.580.tiq_spectrogram.npz |
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
We called HKR, they said they will investigate, awaiting response.
last file that contains data: RSA01-2025.04.02.04.09.27.044.tiq_spectrogram.npz
file from which only noise is contained: RSA01-2025.04.02.04.09.31.905.tiq_spectrogram.npz
At 04:09: drop of beam in the SIS as shown in screenshots.
For a minute there were still good data. Files from:
RSA01-2025.04.02.04.13.44.629.tiq_spectrogram.npz
to:
RSA01-2025.04.02.04.14.47.805.tiq_spectrogram.npz
05:30 update from HKR: There is a problem with the ESR main power supply. We have to wait. |
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Wed Apr 2 04:33:57 2025, Carlo, Zac, Chris, DAQ, Screenshots Lassie
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screenshots of Lassie |
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Wed Apr 2 02:51:31 2025, Carlo, Zac, Chris, DAQ, Beam is back
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02:44 beam is back |
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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 00:59:43 2025, Zac, Carlo, Chris, Accelerator, Lost the beam
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Beam was lost from 00:44 until 00:59 |
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Wed Apr 2 00:08:57 2025, Ruijiu Chen,Shahab, Analysis, the peak corresponding to 194Pb⁸²⁺ was mixed with signals from some unknown ions.
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I examined the spectrum of 194Pb at the 211 harmonic. It was observed that the peak corresponding to 194Pb82+ was mixed with signals
from some unknown ions. Consequently, we switched to the 212 harmonic, where the frequency of 194Pb82 was measured at 410.5385024. |
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Tue Apr 1 23:56:18 2025, Shahab, Carlo, Zac, Yue, Michael, DAQ, Change of RSA01 settings for new harmonic=212.
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23:55 stop the RSAs.
410:
last file from previous setting (harmonic=211): 2025.04.01.23.55.21.712.
new plunger position for 410 cavity: 33.5 inside and outside.
new center frequency: 410535000 Hz.
245:
harmonic didn't change, still 126.
adjusted center frequency to 243997000 Hz.
00:31 restart the RSAs.
new files from: 2025.04.02.00.31.11.796. |
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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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Tue Apr 1 23:07:15 2025, Shahab, DAQ, short interruption of queqiao script for RSAs
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has been restored. |
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Tue Apr 1 22:53:59 2025, Esther, General, Lassie exports
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Tue Apr 1 22:05:24 2025, Ruijiu , Analysis, analysis result
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This is a preliminary result during 4:00-19:00 April 1st 2025.
I correct the frequency drift of 194Pb82+ ions injection by injection.
I have analyzed all injection data during 4:00-19:00 and calculated the frequency of 194Pb82+ for each injection. This is the frequency of 194Pb82+ as
a function of time. You can clearly see that the frequency of 194Pb82+ was drifted from 408.603 to 408.600 MHz. The variation of frequency is about
3kHz. |
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Tue Apr 1 22:03:07 2025, Jeroen, Zac, Esther, Shahab, Wolfram, DAQ, Optimisation of settings
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Estimation of potential gain by changing. Files from this points are going to rubbish. Potential gains are c. 20%
22:04: The current acquisition window is recording for 2.9 s. And is not recording for 3.9 s. We are running currently with a spill cycle of 5s every repetition.
22:22 The spill cycle between each injection was changed to 4->3->2s progressively and FRS also stopped taking spills so we settled on 2s spill request.
In the morning the spill request has to be changed back to 5s when the FRS goes back into operation.
new file with the setting is
RSA01-2025.04.01.22.19.06.761.tiq
[analysis]
nframes = 190
lframes = 65536
navg = 1 |
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Tue Apr 1 20:37:04 2025, Jeroen, DAQ, Change of settings for shorter acq. window
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Acquisition stopped at 20:36.
First file from this setting: RSA01-2025.04.01.03.52.59.247.tiq
Last file from this setting: RSA01-2025.04.01.20.36.54.257.tiq
acq. length changed to 500 ms
acq bw changed to 50 MHz
==> 12 MSamples
Trigger window condition set to 50%.
First file from this setting: RSA01-2025.04.01.20.45.40.053.tiq
Analysis setting the the frame length 2^16 and frame number = 190. |
 Tue Apr 1 21:05:20 2025, Jeroen, Zac, Esther, Shahab, Wolfram, DAQ, Change of settings for shorter acq. window
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> Acquisition stopped at 20:36.
>
> First file from this setting: RSA01-2025.04.01.03.52.59.247.tiq
>
> Last file from this setting: RSA01-2025.04.01.20.36.54.257.tiq
>
> acq. length changed to 500 ms
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> acq bw changed to 50 MHz
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> ==> 12 MSamples
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> Trigger window condition set to 50%.
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> First file from this setting: RSA01-2025.04.01.20.45.40.053.tiq
>
> Analysis setting the the frame length 2^16 and frame number = 190.
Last file from previous setting: RSA01-2025.04.01.21.06.30.580.tiq
Changed the RSA01,02 to 50 MSamples/s (20nsec/sample) for 500.00 ms acq. length, 25 MHz acq. BW, 33% trigger position.
First good file from this time: 21:37 04.01.2025 -- RSA01-2025.04.01.21.37.13.721.tiq |
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Tue Apr 1 20:00:14 2025, Jeroen, Zac, Esther, Accelerator, Beam fell out
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No beam from 19:57:41. |
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Tue Apr 1 20:02:19 2025, Jeroen, Zac, Esther, Accelerator, Beam fell out
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> No beam from 19:57:41.
Beam back from 20:02 |
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Tue Apr 1 20:19:23 2025, Jeroen, Zac, Esther, Accelerator, Beam fell out
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> > No beam from 19:57:41.
>
> Beam back from 20:02 |
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Tue Apr 1 17:08:13 2025, JG, ID, MC, CG, Detectors, pleiades in position
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The pleiades detectors are now moved into a position which does not disturb the stored beam.
inner detector: BGO
device: GE01DD2IG
position: +20mm
scraping beam: not possible
outer detector: GAGG
device: GE01DD2AG
position: -55mm
scraping beam at: -45mm
These positions are fixed, i.e. not moving automatically. |
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