Issue, posted by Jan Gruenert on 25 Sep 2024, 09:47 
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Issue with SA3 Gas attenuator (SA3_XTD10_GATT)
9h06: SQS informs PRC that the Argon line in GATT is not reacting on pressure change commands,
no GATT operation, which is required to reduce pulse energies for alignment. VAC-OCD is informed.
ZZ access is required to check hardware in the tunnel XTD10. |
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Issue, posted by Raśl Villanueva-Guerrero on 25 Sep 2024, 10:12
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Issue with SA3 Gas attenuator (SA3_XTD10_GATT) - SOLVED
Dear all,
after the reported issue by SQS colleagues regarding the impossibility to inject Argon, and after a first remote evaluation, we (VAC) have entered
XTD10 to assess the status and verify the most probable working hypothesis: a manual valve in the supply line was closed (otherwise as expected). Joshua |
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Issue, posted by Chan Kim on 25 Sep 2024, 16:53
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600um thick CVD diamond (XTD2 attenuator) seems damaged
Attachment 1: 600um thick CVD diamond (Arm 4) OUT |
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Issue, posted by Jan Gruenert on 29 Sep 2024, 11:42
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A2 failure - downtime
The machine / RC informs (11h22) that there is an issue with the accelerator module A2 (first module in L1, right after
the injector).
This causes a downtime of the accelerator of 1 hour (from 10h51 to 11h51), affecting all photon beamlines. |
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Issue, posted by Naresh Kujala on 07 Oct 2024, 15:15
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14:40hr
FXE and HED reported the laser synchronization issue. Informed to Machine RC.
LbSync team couldn't fixed this issue remotely and on there way to Schenefeld to fix this issue. |
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Issue, posted by Frederik Wolff-Fabris on 12 Nov 2024, 10:07
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- While FEL IMG with YAG screen was inserted in SA1, EPS/MPS was not limited to the expected 2 bunches, but to 30 bunches;
- It was found
the condition #3 ("SA1_XTD2_VAC/Switch/SA1_PNACT_Close") at the EPS Mode-S was disabled which should be always enabled;
- Condition
#3 has been enabled again and now SA1 is limited to 2 bunches, as expected when YAG screen is inserted.
Further investigations will be done to |
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Issue, posted by Frederik Wolff-Fabris on 15 Nov 2024, 10:50
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SA2 cell#5 undulator segment moved at ~09:45AM Fri to 25mm without aparent reason and undulator experts need a ZZ to exchange power supply; FEL
instensity dropped from 230uJ to 60uJ s consequence.
RCs are preparing south branch for the iminent ZZ. HED is informed. |
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Issue, posted by Jan Gruenert on 23 Nov 2024, 00:36
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20h16: beam down in all beamlines due to a gun problem
20h50: x-ray beams are back
Shortly later additional 5 min down (20h55 - 21h00) for all beamlines, then the gun issue is solved. |
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Issue, posted by Jan Gruenert on 23 Nov 2024, 00:48
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Broken Bridges
Around 21h20 the XPD group notices that several karabo-to-DOOCS bridges are broken.
The immediate effect is that in DOOCS all XGMs in all beamlines show warnings
(because they don't receive important status informations from karabo anymore, for instance the insertion status of the graphite filters nrequired |
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Issue, posted by Jan Gruenert on 23 Nov 2024, 10:23
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Broken Radiation Interlock
Beam was down for all beamlines due to a broken radiation interlock in the SPB/SFX experimental hutch.
The interlock was brocken accidently with the shutter open, see https://in.xfel.eu/elog/OPERATION-2024/203
Beam was down for 42 min (from 3h00 to 3h42) but the machine came back with same perfomrmance. |
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Issue, posted by Jan Gruenert on 23 Nov 2024, 10:27
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SA1 Beckhoff issue
SA1 blocked to max. 2 bunches and SA3 limited to max 29 bunches
At 9h46, SA1 goes down to single bunch. PRC is called because SA3 (SCS) cannot get the required >300 bunches anymore. (at 9h36 SA3 was limited
to 29 bunches/train) |
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Issue, posted by Jan Gruenert on 23 Nov 2024, 15:11
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Damage on YAG screen of SA1_XTD2_IMGFEL
A damage spot was detected during the restart of SA1 beam operation at 14h30.
To confirm that it is not something in the beam itself or a damage on another component (graphite filter, attenuators, ...), the scintillator
is moved from YAG to another scintillator. |
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Issue, posted by Jan Gruenert on 24 Nov 2024, 13:47
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Beckhoff communication loss SA1-EPS
12h19: BKR informs PRC about a limitation to 30 bunches in total for the north branch.
The property "safety_CRL_SA1" is lmiting in MPS.
DOC and EEE-OCD and PRC work on the issue. |
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Issue, posted by Jan Gruenert on 24 Nov 2024, 14:09
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Beckhoff communication loss SA1-EPS (again)
14h00 Same issue as before, but now EEE cannot clear the problem anymore remotely.
An access is required immediately to repair the SA1-EPS loop to regain communication.
EEE-OCD and VAC-OCD are coming in for the access and repair. |
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Issue, posted by Jan Gruenert on 05 Dec 2024, 07:38
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Accelerator module issue
7h20: BKR/RC inform that there is was issue with the A12 Klystron filament which had caused
a short downtime (6h15-6h22) and was taken offbeam.
Beam was recovered in all beamlines, but the pulse energy came back lower especially in SA1 (before 920uJ, after about 500 uJ) and higher fluctuations. |
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Issue, posted by Johannes Moeller on 05 Dec 2024, 09:18
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MID operation limited to 55 bunches by SA2_XTD1_OPTICS_PROTECTION/MDL/ATT1 because of inserted Si 0.5mm. Seems a bit too tight for 1mJ@17keV, since diamond
is not so usefull at this photon energy anymore. |
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Issue, posted by Jan Gruenert on 05 Dec 2024, 15:58
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additional comment to MESSAGE ID: 217
PRC was informed by MID at 8h50 about a new appeared limiation to about 60 pulses / train (MID operated previously at 120 pulses/train).
It turned out that this limitation came from the protection of the SA2_XTD1_ATT attenuator, in partiicular the Si attenuator. |
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HED 6keV after Euler MDL, posted by Antje Trapp on 19 May 2024, 15:20
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Experiment summary, posted by Naresh Kujala on 28 Jan 2024, 19:55
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X-ray delivery
0.25nC, 14 GeV, rep rate 2.25 MHz, 9300 eV, 1 to 100 pulses, ~2000 uJ
M1 and M2 mirrors are aligned and beam trajectory to
SPB.
Goal |
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Experiment summary, posted by Konopkova Zuzana on 13 Feb 2024, 08:55
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*Achievements :
- Generally rather successful with very high quality beam parameters
- We had a nearly steady 800 uJ+ HXRSS flux during the user run and ~ 4mJ SASE during the setup at HED. |