start of shift - status, posted by Antje Trapp on 10 Apr 2024, 16:35 
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Starting shift with mirror motor calibration:
- beam is centered on FEL imager
- pblm in XTD9 is inserted |
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start of shift - status, posted by Antje Trapp on 10 Apr 2024, 16:35
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Starting shift with mirror motor calibration:
- found solid attenuator 0.5mm silicon inserted
- beam is centered on FEL imager |
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other, posted by Tommaso Mazza on 09 May 2024, 10:45
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we needed SASE1 to be set to 0 pulses briefly to check alignment in our experiment.
The FXE control hutch was empty. we could not reach either Chris nor Mykola by phone. The XFEL_StatusPublic shows that the FXE shutter is closed
(we can also see the exp hutch door open from outside the control hutch). |
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Status, posted by Naresh Kujala on 01 Mar 2024, 17:11
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-Machine status
the cold compressor failure occurred at ~16.30hr today. And it will take around 35 hr to fix it. I will update via email (local contacts for
experiments) and Operation Elog tomorrow with more details. |
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Status, posted by Romain Letrun on 13 Mar 2024, 10:09 7x
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We checked the XTD2 attenuators following the intervention from XRO (compar ewith elog:37, before the intervention).
The wavefront shows similar distortions with the 75 and 150 um as earlier, which is not too surprising since the cracks are vertical.
Attachments 1-5: Beam on SPB_XTD9_SCR with XTD2 attenuator CVDs |
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Status, posted by Harald Sinn on 10 Apr 2024, 11:55
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Yesterday two motors of the SASE2 seeding mono were damaged. The mono was exchanged in the afternoon and pumped down. Currently, an issue with the vertical
cystal motion is being investigated. The vacuum improved much faster than expected after this intervention, so the hope is that the tunnel can
be searched soon and electrons could go through SASE2 already this afternoon. Watch for updates in the program for SASE2 in the DESY logbook under |
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Status, posted by Jan Gruenert on 18 Apr 2024, 19:31
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The intra-bunchtrain feedback (IBFB) was not active until today afternoon.
Although not strictly required or requested for the current week experiments,
it was decided to turn on this feedback, which should generally be active to |
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Status, posted by Frederik Wolff-Fabris on 25 Apr 2024, 21:11
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V0 valve for SA2 closed as the pump P22090I at HED branch enters in wrong state. This closed nearby vacuum valves for HED branch and consequently
V0. Vacuum levels at the section remained in 10^-9 all time.
Thanks to VAC-OCD Denis Finze we removed this pump signal from interlock to allow operation in SA2 at MID branch. Further investigation will |
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Status, posted by Dirk Raiser on 17 May 2024, 10:42
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Laser status:
After the laser issues listed in https://in.xfel.eu/elog/OPERATION-2024/99 the
late shift was finally able to find a timing setting for the amplifier trigger that was beyond stable settings under usual conditions, but which allowed |
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Status, posted by Peter Zalden on 14 Sep 2024, 01:33
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FXE received the beam and did not change accelerator settings.
Beam alignment to FXE was re-established using the new values for the old M1/M2 offset.
Monochromator aligned to the SPB energy setpoint. |
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Status, posted by Jan Gruenert on 27 Sep 2024, 15:17
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Bunch pattern SA1 / SA3
SQS requests to change the bunch pattern.
Currently SA1/SA3 run interleaved as 131313...
The first bunch in the train (for SA1, non-lasing in SA3) nevertheless is visible as a small pre-peak in the diode signal which SQS uses to check |
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Status, posted by Jan Gruenert on 29 Sep 2024, 12:13
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Beam is back. Current status:
SASE1 (SPB/SFX)
2.72 mJ, 352 bunches/train, 6 keV
SASE2 (MID)
880 uJ,
1 bunch/train, 8 keV
SASE3 (SQS)
4.56 mJ, 1 bunch/train, 400 eV (3.1nm)
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Status, posted by Naresh Kujala on 07 Oct 2024, 16:34
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Desy Laser group has fixed the issue about the laser Synchronization.
https://ttfinfo.desy.de/XFELelog/show.jsp?dir=/2024/41/07.10_M&pos=2024-10-07T14:51:12
Naresh |
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Status, posted by Jan Gruenert on 24 Nov 2024, 17:23
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Status
All beamlines in operation.
The attachment ATT#1 shows the beam delivery of this afternoon, with the pulse energies on the left and the number of bunches on the right.
SA2 was not affected, SA1 was essentially without beam from 13h45 to 16h15 (2.5h) and SA3 didn't get enough (386) pulses in about the same period. |
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Status, posted by Jan Gruenert on 04 Dec 2024, 15:34
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| Beam delivery Status well after tuning finished (which went faster than anticipated). |
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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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Stability Issue, posted by Thomas Baumann on 26 May 2024, 21:56
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We asked the machine for two color mode in the morning. Tuning gave good results at first (1.6mJ second color, 100uJ first color), but as soon as any
of the colors was switched off and on again the pulse energy dropped (~600uJ) and BKR had to retune to even get a fraction of the pulse energy back back.
The same happened when changing the delay |
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Stability Issue, posted by Chan Kim on 29 Sep 2024, 22:29
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X-ray beam is continuously drifting in the vertical direction (XTD9_XGM)
It affects our NKB focus and focused beam is also drifting continuously. |
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Stability Issue, posted by Alexey Zozulya on 05 Dec 2024, 19:47
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Today we have observed multiple large disturbances to beam stability. These can be characterised by large jumps in the horizontal beam position, which
at its extreme amounts to a loss of beam from our behalf. M2 mirror feedbacks are able to return the beam to the initial position after ca. 10 minutes.
Beam jumps have been approximately 1hr apart. We do not observe the beam on the XTD6 tunnel imager in this case, but do observe good lasing quality on |
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Stability Issue, posted by Johannes Moeller on 06 Dec 2024, 06:37
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| The jumps keep repeating very frequently since yesterday afternoon. The overall drift of the beam seems to accalerate as well. |