Shift summary, posted by Jörg Hallmann on 08 Dec 2024, 02:49
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successful measurements of elastomer, gelatine & bio samples
issue:
beam loss at about 2:45 due to communication issues with accelerator modules |
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Shift summary, posted by Jörg Hallmann on 07 Dec 2024, 02:04
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data collection of bubbles in elastomers (good progress)
issue: beam loss in the tunnel during the day - experts checked the situation and the situation improved during the evening |
Stability Issue, posted by Johannes Moeller on 06 Dec 2024, 07:49 
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| And since the 4th there are some instabilities in the vacuum levels at M1 and M2 as well. |
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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. |
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Shift summary, posted by Jörg Hallmann on 06 Dec 2024, 02:41
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optimization of the timing of the involved components (laser, cameras, FEL)
generation of the first bubbles in water
issue |
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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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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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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, 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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Shift summary, posted by Jörg Hallmann on 05 Dec 2024, 00:06
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machine runs at 17 keV with about 1.2 mJ
achievements: |
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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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Shift summary, posted by Tomas Popelar on 04 Dec 2024, 07:12
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X-ray delivery
19 keV, ~ 400 - 450 uJ, 1 - 128 pulses, stable delivery
Optical laser |
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Shift summary, posted by Tokushi Sato on 01 Dec 2024, 23:07
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X-ray delivery
19 keV, ~450 uJ, 1 - 128 pulses, stable delivery
Optical laser |
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Shift summary, posted by Tokushi Sato on 30 Nov 2024, 23:01
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X-ray delivery
19 keV, ~550 uJ, 1 - 128 pulses, stable delivery
Optical laser |
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SA1 status, posted by Andreas Koch on 26 Nov 2024, 09:47
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Concerning damage of the SA1 FEL imager, Operation-2024 eLog #206
The screen position of the YAG screen - when pressing the screen selection button - has been moved by 1 mm so that the damaged area is out of the |
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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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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 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 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 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) |