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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SA2 status, posted by Jan Gruenert on 20 Apr 2024, 23:58
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20.4.2024 / 22h51:
DOC informed PRC that the SASE2 topic broker had to be restarted.
The EPS power limit was reset by PRC to the previous value of 40 W. |
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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Issue, posted by Andreas Galler on 01 May 2024, 16:39
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840 pulses not possible at SXP due to big brother settings for the EPS Power Limit rule. The minimum pulse energy was assumed to be 6 mJ while the actual
pulse XGM reading is 550 uJ.
Solution: The minimum assuemd pulse energy had been lowered from 6 mJ to 2 mJ. This shall be reverted on Tuesday next week. |
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Issue, posted by Raúl Villanueva-Guerrero on 08 May 2024, 13:51
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Dear all,
Due to a probable issue at the SA1 Transmissive imager, the "OUT" and "YAG" position indication signals seems to be not responsive.
After the FXE team noticed that MODE S was interlocked, the root cause has been narrowed down to this component. Later, further investigation |
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Issue, posted by Harald Sinn on 24 Jul 2024, 10:26
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In SASE2 undualtor cell 10 has issues. Suren K. will do a ZZ at 11:30 to fix it (if possible). Estimated duration: 1-3 hours.
Update 12:30: The problem is more severe than anticipated. Suren needs to get a replacement driver from the lab and then go back into the tunnel
at about 14:00 |
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Issue, posted by Harald Sinn on 24 Jul 2024, 11:35
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The control rack of the soft mono at SASE3 has some failure. Leandro from EEE will enter the XTD10 at 12:00.
Beam will be interupted for SAS1 and SASE3.
Estimate to fix it (if we are lucky) is one hour. |
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Issue, posted by Harald Sinn on 27 Jul 2024, 09:10
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SASE1: Solid attenuator att5 is in error. When it is tried to move it out, the arm lifts, but does not reach the final position before the software time-out.
We increased the software time-out from 4 seconds to 7 seconds, which didn't help. We suspect that there is a mechanical problem that prevents
the att5 actuator to reach the out position. |
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Attention, posted by Andreas Galler on 11 Aug 2024, 00:13
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EPS Interlock change for Mode30:
the 3 HIREX Interlock conditions had been disabled
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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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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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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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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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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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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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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. |