Shift summary, posted by Tokushi Sato on 26 Apr 2025, 06:55
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Staff: PV, TS, JK + external collaborators
X-ray delivery:
10 keV, ~ 800 uJ, 128 pulses, tuning was needed for 10 min. |
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Shift end, posted by Tokushi Sato on 27 Mar 2025, 22:57
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**X-ray delivery:**
* 16 keV, ~upto 1 mJ, 160 pulses
**Optical Laser:** |
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SA3 status, posted by Andreas Koch on 14 Jan 2025, 07:38
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The image intensifier in the SQS Exit Slit imager had been exchanged on request of SQS, Thomas Baumann.
Model: Hamamatsu MCP C9546-03-Y001 against C9546-01.
The position of the YAG screen on the camera is slightly shifted which may slightly affect the spectral axis, a few pixels vertically, and approximately |
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SA3 status, posted by Andreas Koch on 29 Jan 2025, 09:08
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The SA3 FEL imager is now protected via the Big Brother server, which creates a beam limit on the bunch pattern server if necessary.
contact Andreas Koch, Lars Fröhlich for more details or consult the imager manual, section 2.9:
https://docs.xfel.eu/share/page/site/xfelwp74/document-details?nodeRef=workspace://SpacesStore/1766b430-7c48-4c46-bb2d-1774d69e1246 |
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SA3 status, posted by Frederik Wolff-Fabris on 30 Jan 2025, 13:59
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On 29.01 evening the SA3 pre-absorber was interlocked due to M5 mirror.
With the help of Maurizio V., it was found the M5 RY motor has to be driven to 400um position to release the interlock condition and permit beam
to SXP and SQS. This relates to a limit switch which was in a undesired location and about 1mm out of position. |
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SA3 status, posted by Frederik Wolff-Fabris on 31 Jan 2025, 12:43
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A ZZ is organized to happen now, 31.01 at ~12:40, in order to reset a cabinet belonging to one of the Apple-X undulators.
This is agreed with North Branch instruments and RC/BKR.
**Update 13:25: ZZ was successful; SA1 and SA3 beams restored at 13:25 |
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SA3 status, posted by Jan Gruenert on 09 Apr 2025, 10:22
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SASE3 Apple-X undulator cell 26 issue - SOLVED
During the night, an issue appeared with the SASE3 undulator cell 26 (2nd last Apple-X undulator).
This cell could not be operated and was in status open. |
SA2 status, posted by Harald Sinn on 06 Apr 2025, 06:33 
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5:49 HED called and they have problems with the Laser Sync signal. A change of laser delay is not possibe. We supsect that it is similar to earlier this
week at FXE, where a crash of a sync CPU caused a similar error. BRK is informed and tries to reach somebody from sync Group via email (at 6:35, no OCD
phone number available) . If this does not work, we will work with the shifts starting at 7:00 on this (DOC and new BKR crew). |
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SA1 status, posted by Harald Sinn on 03 Apr 2025, 07:34
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7:20 FXE reports a problem with laser synchronisation (yellow warning light and could not change delay). BKR informs the DESY laser sync group.
7:51 DESY sync group reported that there was a CPU failing about 6 am this morning which led to the yellow warning light. However, synchronisation
was very likely all the time ok withing 5-10fs. The CPU was now reset and everything should be wokring now. |
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SA1 status, posted by Harald Sinn on 07 Apr 2025, 07:19
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7:15 SPB reports large background from non-lasing SASE3 bunches. BKR is informed.
7:50 BKR analysed situation. Everything concerning the orbits is OK, so the background is due to the standard spontaneous background (about <
1% level of FEL beam). With SASE3 running currently 255 lasing bunches and SASE1 single bunch the intensities will be on a similar level. Recommendation |
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Issue, posted by Jan Gruenert on 19 Jan 2025, 11:46
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1) BKR calls SUN11h20 and informs about issues with the SA1 SRA. Motors in ERROR.
2) Additionally, there was this morning a fire alarm, where in one rack (SASE1 rack 1.1 in XTD2) the gas extinguishing system was triggered,
see also https://ttfinfo.desy.de/XFELelog/show.jsp?dir=/2025/03/19.01_M&pos=2025-01-19T10:22:14 |
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Issue, posted by Peter Zalden on 06 Feb 2025, 23:02
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We observed a damage spot on the SA1 FEL imager. It moves with the target holder, but not sure if its damage on the optical mirror or on the target itself.
This issue is not critical, but can become problematic in case one wants to determine beam size or state of optics (ATT or CRLs) upstream. |
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Issue, posted by Raphael de Wijn on 06 Feb 2025, 23:24
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| Damage on FEL imager was also seen by our morning shift around 7:50am. |
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Issue, posted by Martin Dommach on 01 Mar 2025, 11:53
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Due to issues SCS has with pulses from SASE1 lasing in SASE3 and destroying,
or at least modifying, their sample, it was decided to change the order
in the RF configuration to have SASE3 pulses before SASE1. The change will be done at 12 pm, agreed with FXE. |
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Issue, posted by Romain Letrun on 17 Mar 2025, 06:51
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| The status of the FXE shutter in the Public status display DOOCS panel is incorrect. Here appears as opened, when it is actually closed. |
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Issue, posted by Jan Gruenert on 09 Apr 2025, 09:41
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SASE1 XTD2 attenuator arm issue
On monday 7.4.2025, one of the SASE1 attenuator arms (SA1_XTD2_ATT/PNACT/A9) with a 2mm Silicon attenuator got stuck when inserted
EEE reports in the XO meeting today that DOC / EEE helped to unblock and remove it from the beam |
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Issue, posted by Konopkova Zuzana on 24 Apr 2025, 08:42
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self-seeding level in SA2 is currently very low (~100 uJ, about 50% in the pedestal), need more information on how to proceed - is there any chance to
improve the seeding, or should we consider going to sase operation. |