Issue, posted by Romain Letrun on 30 Mar 2024, 06:59 
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DOOCS panels are again incorrectly reporting the FXE shutter as opened when it is in fact closed. This had been fixed after it was last reported in February
(elog:24), but reappeared now. |
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(Resolved) Issues with DAQ, posted by Björn Senfftleben on 30 Mar 2024, 00:17
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We had some trouble with the DAQ. It was not able to start runs properly.
We got the following error messages:
initially: |
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Shift summary, posted by Chan Kim on 29 Mar 2024, 22:38
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X-ray delivery
- 12.72 keV, 10Hz, ~1.4 mJ/pulse, stable delivery
Optical laser delivery |
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Issue, posted by Chan Kim on 28 Mar 2024, 14:56
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| Pulse energy fluctuation observed after full train operation in SA2 starts. |
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Shift summary, posted by Chan Kim on 28 Mar 2024, 14:54
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X-ray delivery
12.72 keV, 10 Hz, NOT stable delivery, pointing drastically changed in the afternoon, presumably due to the train-on-demand operation
at SASE2
Optical laser delivery |
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Shift summary, posted by Peter Zalden on 23 Mar 2024, 23:12
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User experiment transient grating, Cris Svetina. (LTP)
Used 7.11 keV from ACC with very good performance, above 4 mJ.
Collected pump-probe data on user sample most of the time
today
FXE will operate in 24h mode for the rest of the delivery week
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Shift summary, posted by Peter Zalden on 22 Mar 2024, 23:13
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User experiment transient grating, Cris Svetina. (LTP)
Used 7.11 keV from ACC with very good performance, above 4 mJ.
Collected pump-probe data on user sample most of the time
today, only minor interruptions due to accelerator outages
After the outage at 21h, SASE came back with 17 eV lower photon energy, so we had |
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Shift summary, posted by Raphael de Wijn on 22 Mar 2024, 06:35
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X-ray delivery
- 9.3 keV, >3 mJ/pulse, beam down around 30min
Optical laser delivery |
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Shift summary, posted by Peter Zalden on 21 Mar 2024, 23:20
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User experiment transient grating, Cris Svetina. (LTP)
Used 7.12 keV from ACC with very good performance, above 4 mJ.
Collected pump-probe data on user sample
Sudden
timing jump of around 20 ps. Could not find out why this happened some time between 9h today and 18h.
Needed to add camera to DAQ. Solved this |
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Shift summary, posted by Raphael de Wijn on 21 Mar 2024, 06:33
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X-ray delivery
- 9.3 keV, >3 mJ/pulse, stable delivery
Optical laser delivery |
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Shift summary, posted by Peter Zalden on 20 Mar 2024, 23:15
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Preparation for user experiment transient grating, Cris Svetina
Used 7.12 keV from ACC with very good performance, above 4 mJ
Got spatiotemporal overlap with transient gratings using monochromatic
beam
One issue solved by DOC: Picomotors could not be scanned in karabacon, even though this worked well two/three weeks ago
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Shift summary, posted by Giuseppe Mercurio on 20 Mar 2024, 23:03
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Late shift summary
coarse timing
installed laser shutter on the laser
breadboard and I0 diode
exchanged camera of microscope to improve resolution
knife edge scans of FEL after BOZ
realized
that knife edge scans of OL cannot be done with present setup because OL cannot reach the diode in DIAG
Nahid prepared FeByP 1 liter, 30 mM
preparation |
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Issue, posted by Frederik Wolff-Fabris on 20 Mar 2024, 12:41
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BKR called PRC around 06:10AM to inform on vacuum issues at SA1 beamline leading to a lost beam permission for the North Branch.
VAC-OCD found an ion pump in the PBLM / XTD9 XGM presented a spike in pressure that triggered valves in the section to close.
After reopening valves the beam permission was restored; further investigations and monitoring in coming days will continue. Currently all systems |
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Issue, posted by Harald Sinn on 16 Mar 2024, 12:12
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11:15 SASE1/SPB called that they observed and issue with the SASE1 XGM/XTD2: about every 35 seconds the power reading jumps from 4 Watts to zero and
back. It seems to be related to some automated re-scaling of the Keithlyes, which coincides. The fast signal and downstream XGMs do not show this behavior.
The concern is that this may affect the the data collection later today. |
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Shift summary, posted by Chan Kim on 15 Mar 2024, 23:43
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**X-ray delivery**
- 6 keV, 3.2 mJ/pulse, stable delivery
**Optical laser delivery** |
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Stability Issue, posted by Tommaso Mazza on 15 Mar 2024, 18:02
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it is not clear why, but the beam position on BIU2 has changed over time, even more since we checked last. it is off in both directions
we see the GATT aperture projection drifting, so it is a change in the beam transport, not in the source.
see the beam, cut by the DIAG1 slit, compared to the cross it should be centred to. |
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Issue, posted by Romain Letrun on 15 Mar 2024, 07:08
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There are now two watchdogs for the XTD2 attenuator running at the same time
SA1_XTD2_WATCHDOG/MDL/ATT1_MONITOR020
SA1_XTD2_OPTICS_PROTECTION/MDL/ATT1
that are configured differently,
which results in different pulse limits (see attachment). |
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Shift summary, posted by Chan Kim on 15 Mar 2024, 00:16
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X-ray delivery
6 keV, 2.4 mJ/pulse, stable delivery
Optical laser delivery |
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Issue, posted by Harald Sinn on 15 Mar 2024, 00:07
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SASE1 bunch number was reduced to 10 pulses for no obvious reason.
Traced it back to a malfunctioning of the watchdog for the solid attenuator (see attached error message)
Deacttivated the watchdog for SASE1 solid attenuator. Re-activated it again. |
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Shift summary, posted by Chan Kim on 13 Mar 2024, 23:41
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X-ray delivery
6 keV, 2.6 mJ/pulse, stable delivery
Optical laser delivery
800nm PP laser, stable delivery
Achievements/Observations |