late shift summary, posted by Laurent Mercadier, Giuseppe Mercurio on 22 Apr 2023, 23:32
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Achievements
Work on laser to improve the beam profile and reduce pointing. Apertured the beam upstream of focusing lens and changed to f=750 mm.
Significant improvement.
Characterized beam size, found positions of photodiode, antenna
Check coarse timing with reference
Aligned |
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late shift summary, posted by Loic Le Guyader on 06 Jun 2023, 23:11
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achievements
aligned the beam through up to the XOX imager
prepared FFT for reflectivity measurement
tested new DSSC gain files
for Tb M5 edge
problems |
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late shift summary, posted by Loic Le Guyader on 09 Jun 2023, 22:52
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achievements
try pumping STE membrane with FEL and detect THz emission with single shot EOS. No success.
tried cross-polarization for a
short time, no success either.
reduced the PPL chirp to record single shot transient reflectivity data versus BAM for the night.
issues |
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late shift summary, posted by Loic Le Guyader on 10 Jun 2023, 23:24
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achievements
checked coarse timing between FEL and PPL at XOX. It had shifted significantly
determined that light coming out of sapphire
from FEL was not heating but fluorescence
observed for the first time THz emission from STE from FEL pump on sapphire substrate and mesured |
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late shift summary, posted by Laurent Mercadier on 12 Jun 2023, 01:06
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Achievements
Optimized THz EOS, managed to observe single shot EOS trace with good SNR
Characterized chirp with different glass lengths
Ran
SiN spectral encoding in parallel
Issues |
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late shift summary, posted by Andreas, Sergii on 04 Aug 2023, 23:20
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achievements:
hooked up sample cooling and reached 20K at sample at typical low consumption rate
we archieved targeted resolving power of
~10,000 or 86meV @ 857eV at low temp 20K after indications that heating broadens the elastic line of CoO
we observe sample damage at 30% and |
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late shift shift summary, posted by Laurent Mercadier, Luigi Adriano on 15 Feb 2023, 01:40
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Achievements
Two color mode established with 11.5 GeV, 1.335 keV col1, 1.27 keV col2
Beam size characterized using Viking + online tool
Jet
found by scanning and looking at transmitted signal on Viking
Problems |
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last late shift UP3463, posted by Giuseppe Mercurio, Laurent Mercadier on 23 Apr 2023, 23:38
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Achievements
Beam transport
Coarse and fine timing
XAS on Co
Aligned HSLIT, pinhole, camera beamstop
Characterize
FEL beam size and position on curved grating
PPL Power measurement
Fluence scan on sample of optical laser and FEL to determine good |
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end of shift summary, posted by Giuseppe Mercurio, Laurent Mercadier on 28 Jul 2023, 14:56
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achievements:
found new M2 bender position for focusing using blank
tried to use unfocused beam for ESLITS calibration, but could not see
it at SCSPopin, only at M5 Popin
we moved the XRD chamber laterally, closer to hRIXS, to be able to cut the beam using the sample at grazing |
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end of shift summary, posted by Antje Trapp on 25 Jan 2024, 14:57
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It was possible to align to HED in parasitic mode to seeding tests
mirror horizontal position (coating stripes) was optimized as far as possible under parasitic conditions
vertical motors calibration and EulerMDL calibration still to be done - collimated beam needed for that. |
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end of shift summary, posted by Antje Trapp on 26 Jan 2024, 15:24
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Vertical motors of M3 now calibrated in first iteration and gemetrical neutral calibrated to 0 in motor settings!!!
New HED positions saved in XRO setpoints 'C'
euler calibration not completed for M3 |
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ZZ Access on 24th January (19:30h) - Replacement of Motor on SASE2 Undulator - Cell 17 Phase Shifter, posted by Raśl Villanueva-Guerrero on 25 Jan 2023, 08:44
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Dear all,
last evening Suren Karabekyan and myself did a short notice ZZ access to XTD1. The reason is that machine operators detected the lack of response
on the Cell 17 Phase Shifter. The intervention was successful and around 20:30 we left the tunnel. |
XTD2 Si500 attenuator broken, posted by Johan Bielecki on 04 Apr 2023, 11:18 
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Attachment 1: Beam in SPB hutch with Si500
Attachment 2: Beam without Si500 |
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Vacuum Leak in SA2-XTD1 Solid Attenuator - [SOLVED] - Preliminary report, posted by Raśl Villanueva-Guerrero on 09 Jun 2023, 15:41
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Dear all,
After the incidences reported yesterday and the diagnostic remotely done (where we could narrow down the root cause to the edge-welded below
at the Linear stage of the arm Nr. 6 - 2.4 mm CVD diamond], we confirmed this as a fact during the schedule access today. Here is a succint summary of |
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Vacuum Leak in SA2-XTD1 Solid Attenuator - [SOLVED] - Closing report , posted by Raśl Villanueva-Guerrero on 13 Jun 2023, 11:23
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Dear all,
the closing report on this issue can be found in the following Alfresco link:
https://docs.xfel.eu/share/s/GzxORQOGToe_tiug7LIHhQ |
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Taking the beam , posted by Abhisakh Sarma on 13 Jun 2023, 06:49
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BKR changed the beam energy from 15 keV to 12.4 keV
Energy 12.4 keV
Repeatation rate 1.1 MHz |
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Summary: Night 13th and Day 14th, posted by Thomas Baumann on 14 Sep 2023, 16:49
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The late shift on the 13th fixed remaining problems with the DLD and the calibration pipeline.
The night shift was then able to collect data on O2 using the two-color mode. Systematic studies were done at different photon energies for both
colors. This was done for full FEL intensity and 10%. |
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Summary of SA1 shift for XO and instruments, posted by Kelin Tasca on 21 Jul 2023, 17:22
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PBLM checked: https://in.xfel.eu/elog/XRO+Beam+Commissioning/203
Solid attenuators checked: https://in.xfel.eu/elog/XRO+Beam+Commissioning/194 |
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Summary day shift 2023-04-04, posted by Lisa Randolph, Carsten Baehtz, Alexander Pelka on 04 Apr 2023, 07:11
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04 Apr 2023, 07:44 we realize that the SetpointsHED Macro lost all values, probably during the Karabo Crash. Since it is a macro, the values arent stored
anywhere. DOC tries to recover. Meanwhile, we found the values for 3mrad, 2.5mrad and 2mrad in old screenshots and update the macro values from that. Saving
those now locally in nextcloud/user/Alex. |
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Strange pulse behavior upstream XGM, posted by Faisal Hammad Mekky Koua on 17 Jun 2023, 07:41
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- Pulse intensity decreases drastically at XTD2 across the train
- the visualisation of our beam therfore needs to be compensated adjusting transmission
- beam shape and uniformity is different than previous days and it is unclear how much of this is related to real changes in the beam or an effect |