Shift summary, posted by Peter Zalden on 22 Feb 2024, 06:13
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Beam conditions:
Used photon energies between 6 and 7 keV, including short undulator scans
Continuously got 1 mJ despite the short pulse mode
that's running
Bandwidth was found to be 18 eV FWHM at 6.07 keV (0.3%) by monochromator scan against fixed undulator setpoint
Achievements: |
Issue, posted by Peter Zalden on 28 Feb 2024, 06:57 
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Not sure if this is the cause of the fringes reported before, but at 5.6 keV there are clear cracks visible on the XTD2 Attenuators 75 umm and 150um
CVD, see attached. There is also a little bit of damage on the 600 um CVD, but not as strong as the others.
At 5.6 keV we will need to use the thin attenuators. I will mention again in case this causes problems downstream. |
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SA1 status, posted by Peter Zalden on 28 Feb 2024, 08:57
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5.61 keV setpoint in SA1 was confirmed to correspond to 5.660 keV (+/- 0.003 keV), see attached.
The user expt #5644 can proceed as planned. |
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Shift summary, posted by Peter Zalden on 20 Mar 2024, 23:15
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Preparation for user experiment transient grating, Cris Svetina
Used 7.12 keV from ACC with very good performance, above 4 mJ
Got spatiotemporal overlap with transient gratings using monochromatic
beam
One issue solved by DOC: Picomotors could not be scanned in karabacon, even though this worked well two/three weeks ago
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Shift summary, posted by Peter Zalden on 21 Mar 2024, 23:20
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User experiment transient grating, Cris Svetina. (LTP)
Used 7.12 keV from ACC with very good performance, above 4 mJ.
Collected pump-probe data on user sample
Sudden
timing jump of around 20 ps. Could not find out why this happened some time between 9h today and 18h.
Needed to add camera to DAQ. Solved this |
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Shift summary, posted by Peter Zalden on 22 Mar 2024, 23:13
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User experiment transient grating, Cris Svetina. (LTP)
Used 7.11 keV from ACC with very good performance, above 4 mJ.
Collected pump-probe data on user sample most of the time
today, only minor interruptions due to accelerator outages
After the outage at 21h, SASE came back with 17 eV lower photon energy, so we had |
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Shift summary, posted by Peter Zalden on 23 Mar 2024, 23:12
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User experiment transient grating, Cris Svetina. (LTP)
Used 7.11 keV from ACC with very good performance, above 4 mJ.
Collected pump-probe data on user sample most of the time
today
FXE will operate in 24h mode for the rest of the delivery week
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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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Shift summary, posted by Peter Zalden on 23 Aug 2024, 08:48
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Used 9.4 keV with 94 kHz wed and thu nights. Received approx. 0.9 mJ with large fluctuations in pulse energy, however acceptable for the tasks below.
Achievements:
X-ray optics and goniometer aligned for next user experiment 5725
Transmission through Mono #2 recovered and calibrated to |
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Issue, posted by Peter Zalden on 08 Sep 2024, 20:30
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We observe a continuous horizontal beam drift in SA1 after the M1 incident. It seems not to converge, so one can wonder where this will go....
Attached screenshot shows the M2 piezo actuator RY that keeps the beam at the same position on the M3 PBLM. These are about 130 m apart, The
drift is 1V/12 hours. 0.01V corresponds to a beam motion by 35 um. So the drift velocity is 0.3 mm/hour. In the past days this had at least once lead to |
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Issue, posted by Peter Zalden on 09 Sep 2024, 23:19
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| Finally, the drift velocity of the pointing reduced approx a factor of 2 as compared to yesterday, see attached. Possibly it will still converge... |
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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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SA1 status, posted by Peter Zalden on 21 Sep 2024, 09:50
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The xray beam drifted significantly on wednesday and thursday (18. and 19.) but then was not drifting on friday (20.), see attached trendline of the
M2 actuator that kept the beam at fixed position on M3.
Today also seems that beam pointing is stable. But unclear what happened earlier... |
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SA1 status, posted by Peter Zalden on 28 Oct 2024, 09:58
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This is to report some findings during operation that should be looked into (mostly to avoid in the future, because both negatively affect data quality
of the user expt at FXE):
At the moment, the 99:1 mode affects 4 to 5 pulses out of 100 in SA1, see first screenshot that shows in the top right the IPM reading |
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(Resolved) Issues with DAQ, posted by Björn Senfftleben on 30 Mar 2024, 00:17
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We had some trouble with the DAQ. It was not able to start runs properly.
We got the following error messages:
initially: |