Issue, posted by Peter Zalden on 20 Sep 2023, 19:42
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Connerning the phase shifter adjustment after undulator gap scan via karabo:
At 19:30 FXE tested the scan change via Karabo with BKR. When the energy was changed with step size of 100 eV, the intensity of X-ray stays unchanged.
This means the phase shifter adjusment is corrrected and it is working now. |
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Issue, posted by Jan Gruenert on 23 Sep 2023, 07:31
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7:23: RC info:
an electrical power glitch interrupted beam operation, machine down. DESY has power back
and accelerator is recovering beam towards TLD, but no beam possible into TLDs, apparently power issues in Schenefeld. |
Issue, posted by Peter Zalden on 23 Sep 2023, 08:14 
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FXE interlock in fault state. See photo attached with original error message from 6:53h. It cannot be reset by acknowledging. BKR is informed and they
are contacting MPS OCD. |
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Issue, posted by Jan Gruenert on 23 Sep 2023, 08:50
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Updates on power glitch
8h50 No feedback from TS-OCD (still not arrived at SASE3 / SCS ?). Phone is busy. Apparently they are busy working on it in the hall (confirmed
at 9h00). |
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Issue, posted by Jan Gruenert on 23 Sep 2023, 15:35
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SASE2 :
The unavailability of karabo and possibly missing cooling water is a problem for the tunnel components as well.
XGM in XTD6 : server error since about 11am. We don't know about the status of this device anymore, neither from DOOCS or karabo. |
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Issue, posted by Romain Letrun on 30 Sep 2023, 10:11
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On multiple occasions this morning, the number of bunches was reduced to 1 without actions from our side.
Looking at the history of SA1_XTD2_BUNCHPATTERN/MDL/CONFIGURATOR, we noticed changes were applied by this device, presumably originating from
one of the watchdogs in SA1. This kind of silent changes is particularly inconvenient and could be easy to miss if one is not constantly monitoring that |
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Issue, posted by Theophilos Maltezopoulos on 13 Oct 2023, 10:19
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An XGM has two single-shot detectors, XGMD and HAMP.
The XTD2 XGMD amplifiers are damaged, thus I operate the XTD2 XGM with HAMP, which I usually use at > 18 keV.
In summary, the XTD2 XGM is fully operational, but I do not have a spare detector any more! Thus, a ZZ is organized for Monday 16.10. around |
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Issue, posted by Thomas Preston on 24 Oct 2023, 19:26
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Vacuum issue at HED
At 18:26 the vacuum failed in the HED CRL3 chamber in the OPTs hutch. The vacuum failed in the section and tripped the valves in the OPT hutch;
it went from 1e-8 to 5 mbar in seconds. The leak is confined to the CRL chamber -- the sections upstream and downstream are not compromised and still have |
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Issue, posted by Chan Kim on 25 Oct 2023, 04:48
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SA3 background is very strong and it affects our NKB (nano KB, Ru coating) focus.
Attachment 1: optimized NKB focus with 1 pulse @SA3 |
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Issue, posted by Chan Kim on 27 Oct 2023, 03:19
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We observed auto changes of the number of X-ray pulses last night and tonight.
It is related to 500 um thick Si attenuator in XTD2_ATT.
Even with 2.4 mm thick CVD (XTD2_ATT) IN, the number of pulses @SA1 changes to 28 whenever we insert 500 um thick Si attenuator. |
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Issue, posted by Jan Gruenert on 30 Oct 2023, 14:36
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The EPD reading system at the turnstiles of XTD10 entrance were not working this morning.
A necessary ZZ access to XTD10 could not be performed in the morning and had to be postponed.
Resetting the system by Michael Prollius was not sufficient. |
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Issue, posted by Jan Gruenert on 04 Nov 2023, 08:15
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Beam down for SASE1/3: SASE1 XTD2 vacuum issue
Vacuum interlock of the SA1 / XTD2 solid attenuator area triggered closing beamline gatevalves.
VAC-OCD is investigating. No beam possible for SA1/SA3 since 7h18. |
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Issue, posted by Jan Gruenert on 04 Nov 2023, 13:49
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(Temporary) solution for the vacuum incident in SA1
This morning at 7h18 the vacuum interlock of SA1 closed the beamline valves and thus stopped the XFEL beam delivery for SA1 and
SA3. |
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Issue, posted by Jan Gruenert on 05 Nov 2023, 12:18
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Accelerator down 9h23 - 12h
RC / BKR informs (10am), that due to a quadrupole power supply failure in A21 a tunnel access to XTL is required.
After the XTL intervention finished, BKR started beam in SA2 at 12h09. |
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Issue, posted by Jan Gruenert on 05 Nov 2023, 12:47
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North branch down : another e-beam magnets problem
RC informs 12h45 that the linac and the south branch are back in operation and performance is as before the issues with the A21 quadrupole.
However, during the access to XTL, additional manget problems occurred in the T4 and SA3 section. |
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Issue, posted by Johannes Moeller on 22 Nov 2023, 10:19
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The Si 0.5mm absorber of XTD1 attenuator seems to be damaged. First screenshot is with that one inserted. In the second screenshot, it is replaced with
a Si 0.5mm from MID_XTD6_ATT.
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Issue, posted by Jan Gruenert on 18 Apr 2024, 23:19
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22h55:
HED informs that they have issues with the HED pulse picker in XTD6. It affects the ongoing experiment, but not to an extent that they cannot continue
the beamtime. |
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HED summary 25.3., posted by Lisa Randolph on 25 Mar 2023, 21:01
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This day we had lots of issues.
Nightshift noticed that the mirror 2 feedback was not running anymore since about 22hrs; PBLM2 cam was unknown; powercycling recovered
the camera, feedback operational again.
Continued shooting until ~9:00
At ~9:30 the whole Karabo, online cluster were dead. No control |
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HED shift summary 23.-24.3., posted by Lisa Randolph on 24 Mar 2023, 21:46
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8.2 keV, 1-2 bunches, 600uJ
23.3.
did timing runs and optimized the beamline alignment
Karabo was working very slow
continued with sample alignment
performed |
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HED shift summary 22.03., posted by Lisa Randolph on 22 Mar 2023, 23:57
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During the night we worked on the temporal overlap between Relax laser and XFEL.
In the morning we noticed that the beam jitter is quite large (in and out of the aperture of the CRL4 lenses). There seems to be a correlation
with the HED popin. We adjusted the TCC with x-ray and laser. Performed transmission scans. |