Shift summary, posted by Romain Letrun on 10 May 2024, 07:06
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X-ray delivery
11.56 keV, 1-352 pulses @ 1.13 MHz, 2.6-3.1 mJ. Stable delivery.
Intensity gradient with long train could not be reduced by
BKR.
Optical laser delivery |
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Issue, posted by Rebecca Boll on 10 May 2024, 00:04
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our pp laser experienced timing jumps by 18 ns today. this happened for the first time at ~7:30 in the morning without us noticing and a couple of more
times during the morning. we realized it at 15:30 due to the fact that the signal on our pulse arrival monitor (X-ray/laser cross correlator downstream
of the experiment) disappeared. we spent some time to investigate it, until we also see this jump in two different photodiodes different triggers (oscilloscope |
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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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Shift summary, posted by Romain Letrun on 09 May 2024, 07:14
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X-ray delivery
11.56 keV, 1-352 pulses @ 1.13 MHz, 2.6-3.1 mJ.
Average intensity slowly decaying through the night.
Quite some
intensity gradient through the train (~35%).
Optical laser delivery |
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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Experiment summary, posted by Konopkova Zuzana on 05 May 2024, 00:25
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proposal 5700 finished on 04.05. The experiment used 352 pulses at 4.5 MHz and 18 keV to X-ray heat pressurized samples in diamond
anvil cells. Overall succesful on several samples.
Issues:
the requested 20.5 keV photon energy had too low pulse intensities
so we had to go down to 18 keV
pulse energies at 18 keV (300-400 uJ) were insufficient for some samples
the ramp in pulse envelope |
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Shift summary, posted by Juncheng E on 03 May 2024, 23:31
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X-ray delivery
- 9.3 keV, 3.1 mJ, 214 pulses/train at 1.1 MHz and 132 at 0.5 MHz
Optical later delivery |
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Shift summary, posted by Juncheng E on 02 May 2024, 23:19
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X-ray delivery
9.3 keV, 3.3 mJ, 190 pulses/train
Optical later delivery
For jet illumination
Achievements/Observations |
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Shift summary, posted by Juncheng E on 01 May 2024, 23:31
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X-ray delivery
9.3 keV, 3.3 mJ, 190 pulses/train
Optical later delivery
For jet illumination
Achievements/Observations |
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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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Shift summary, posted by Jörg Hallmann on 27 Apr 2024, 02:11
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optimized the FEL energy on the absorption edge of Iridium
measurements on the SDW
of Chromium with max magnetic discharges of the PUMA at different attenuations
changed the sample from Chromium to user samples
issues:
energy scan not efficiently working
poor seeding quality in long FEL trains |
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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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Shift summary, posted by Jörg Hallmann on 25 Apr 2024, 01:50
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instrument alignment including NaFos, DES spectrometer, diamond detector, PUMA & test samples
seeding makes a good impression based on the DES spectrometer |
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Shift summary, posted by Raphael de Wijn on 22 Apr 2024, 23:26
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End of User beamtime 5157
X-ray delivery:
21 keV, ~500 uJ; stable delivery
Optical Laser: |
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Shift summary, posted by Raphael de Wijn on 22 Apr 2024, 00:06
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User beamtime 5157 day 5
X-ray delivery:
21 keV, ~400 uJ
Optical Laser: |
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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. |
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Shift summary, posted by Juncheng E on 20 Apr 2024, 23:37
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Staff: JK, SB, JE, AS, RW, FK
**X-ray delivery:**
- 21 keV, ~500 uJ |
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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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Shift summary, posted by Peter Zalden on 13 Apr 2024, 23:03
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Measurements to check the impact of bunch compression on FXE mono transmission were successful. We could change the peak current between 4 and 12 kA
and saw changes in bandwidth between 17 and 100 eV (at 14 keV). Results are under evaluation.
SA1 brought to safe state: |
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SASE1 MIRROR MOTORS CALIBRATED, posted by Antje Trapp on 11 Apr 2024, 21:54
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Dear all,
we calibrated the mirror vertical motors to their geometrically neutral.
Please be aware that saved values for beamline settings may no longer be valid. This mainly applies to the vertical motor positions, but will |