HED shift summary 22.03., posted by Lisa Randolph on 22 Mar 2023, 23:57
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During the night we worked on the temporal overlap between Relax laser and XFEL.
In the morning we noticed that the beam jitter is quite large (in and out of the aperture of the CRL4 lenses). There seems to be a correlation
with the HED popin. We adjusted the TCC with x-ray and laser. Performed transmission scans. |
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HED Summary 21.3., posted by Lisa Randolph on 21 Mar 2023, 23:39
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Got the beam, aligned it up to the TCC, mirrors in 3 mrad configuration, checked positions for the CRLs. Energy up to 500 uJ at 8.2 keV, 2
bunches.
Feedback M2 PBLM-2 camera was UNKNOWN. Power cycle (just switch off >> on) solved the issue. Also, the screen was extracted. Insert the screen. |
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HED Shift Summary 07.04., posted by Alejandro Laso Garcia on 07 Apr 2023, 23:00
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Morning - Users from proposal 3455 continued with their measurement program. Beam stable during the measurements.
Afternoon - Changed the setup from 3455 to 3326.
Evening - Beginning of the alignment for users. Beam stable. |
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HED Full day shift summary 25.04., posted by Alejandro Laso Garcia on 26 Apr 2023, 07:55
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Morning shift:
- First thing in the morning ~7 am, the MDL in the SASE 2 topic were down. Even the watchdog which prevented us from moving SA2 attenuators.
DOC quickly resolved the issue (10 min). |
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HED Full Day Summary 26.04., posted by Alejandro Laso Garcia on 27 Apr 2023, 07:51
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Morning shift:
- Tried to align the fiducial fiber in IC1 for the streak cameras, however it was unsuccessful.
- The karabo device for the SOP had to be restarted. Crosschecked that all the timings were still correct. |
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Giuseppe, Justine, posted by Giuseppe Mercurio on 06 Sep 2023, 06:35
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achievements:
- we found optimum hRIXS settings for 1020 eV but moving the detector arm
- we found optimum hRIXS settings for 920 eV but moving the detector arm, and then grating pitch and detect arm |
Finding t0 with the PAM, posted by Terry Mullins on 21 Mar 2023, 19:35 7x
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After setting timing witht he diode, we look at the PAM spectrometer and scan the laser timing a bit. We found a clear change in the spectrum -
at >t0, the spectrum was very attenuated and at t<t0, the spectrum was larger. This persisted for many 10s of ps (very unexpected behaviour).
In attachment are the LA3 timing scene, the SQS delay stage, the BAM, and the spectrometer signal from Metro at t0. att. 1 - 4. The averaged |
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FXE beam alignment 9 keV 2 mrad, posted by Kelin Tasca on 20 Jul 2023, 18:23
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Experiment summary, posted by Konopkova Zuzana on 21 Aug 2023, 04:31
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beam: 7.7 keV seeded, ~300 uJ/pulse, 2.2 MHz, 20 pulses
user experiment finilized, IXS scans on Si, Al and Cu at different momentum transfer angles
measurements of plasmons in cold
material only
pulse energy increased slightly, however it is mostly in the SASE pedestal which is insufficient to caramelize the electrons into |
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Experiment summary, posted by Konopkova Zuzana on 16 Oct 2023, 05:05
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Beam parameters: 18.8 keV, 350-600 uJ, 1 pulse
Experiment: Shock compression experiments using DiPOLE 70 J + XRD
- run through most of the users targets, largely succesful |
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Euler calibration and Mirror setpoints, posted by Antje Trapp on 03 Oct 2023, 22:51
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euler MDL was calibrated for all three mirrors.
Optics setpoints saved in XRO setpoints for MID and HED
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Euler MDL bugfix - motor velocities restored after stop, posted by Antje Trapp on 10 Nov 2023, 14:10
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The Euler MDL was updated, so that velocities are restored to standard values also after the stop button was hit before motion was finished.
Please be aware that due to the synchronized motion, which is neccessary to keep the beam on the screen, some motors may move for a longer time
with very slow speed (main reason - backlash compensation). We are working on a solution with a minimum speed. |
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End of shift, posted by Johannes Moeller on 16 Mar 2023, 01:35
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Stable HXRSS delivery with >800 uJ, 1 bunch, 8.99 keV.
Re- Alignment of X-ray beam performed.
-Beam position defined for sample interaction in SAM CAM1. Do not touch SAM CAM1 |
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End of Shift, posted by Trey Guest on 16 Feb 2023, 23:01
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Staff: KK, RB, TG, AS, CK
X-ray delivery
9.3 keV, 1-120 pulses,
Optical laser delivery |
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Early shift summary, posted by Robert Carley on 11 Jun 2023, 17:34
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Achievements
Observed first EOS of THz emitted from FEL-pumped STE on SiC and Si membranes
Explored fluence dependence and damage limits
Explored
sample heating with pulse repetition rate
Measure timing jitter of FEL with and without longitudinal feedbacks engaged
Problems |
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Diamond detector / DDM commissioning, posted by Wolfgang Freund on 26 Nov 2022, 10:40
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beam: 30 keV / 30 uJ
reduce to single bunch for insertion
put FEL imager in |
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Day shift summary, posted by Erik Brambrink on 19 Feb 2023, 08:06
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19 Feb 2023, 08:08 Hand over from night shift
Added polarizer in the PAM beam in the optics hutch, reequilibrated reference arm of PAM
19 Feb 2023, 08:09 Darks taken for JF 1 and 2 |
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CRL3: recalibration of y axis, test of x range and move to SEPS interlock trigger position, posted by karen appel on 16 Jan 2023, 16:01
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CRL3 arm 2, 5 and 9 were mecanically religned to the V groove and retracted to some y position.
The y motor position was recalibrated by moving the motor to the lower limit switch, moving it up by 0.5 mm and then recalibrating the motor
and encoder position to the former software limit position. |
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Beam aligned to HED, posted by Antje Trapp on 21 Jul 2023, 16:54
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| Position stored in XRO setpoints - F and HED setpoints - A |
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Attention, posted by Naresh Kujala on 28 Apr 2023, 16:08
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FXE (Fred) confirmed that they don't use beam for night shifts from Friday to Sunday.
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