ELOG - Shift summary

OPERATION-2023 logbook, Contact: F.Wolff-Fabris, A.Galler, L.Samoylova, H.Sinn

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Message ID: 357 Entry time: 23 Sep 2023, 07:59

Shift summary from Monday 18th 7am until Saturday 7am

Aligned beamline until the beamstop. Macro for recovering mirror positions worked well. Minimal fine tuning required.
Changed energy to 8.4 keV to align spectrometes on Ni kalpha emission.
Characterized focal spot of the x-rays at interaction point via edge scans. Focus of ~4 um as requested by users.
Aligned all laser imaging systems to the interaction point

Verified the xfel photon energy with the HED spectrometers. The energy was off by 30 eV. Tuned the energy for real 7.9 keV, in the BKR screen appears as 7.87 keV
Beamline transmission scans. Focusing CRLs in the optics hutch give 55% transmission. This means from the 700 uJ from XGM1 we get around 250uJ at the interaction point (accounting also for ~75% transmission through the mirrors)
First ReLaX + X-ray test shots. Fine tuned some timings, filtering on the Streaked Optical Pyrometry, etc...
Cancelled night shift, due to no X-rays on Wednesday. Usually at this point we would align targets over night and shoot them during the day.

Beam was not exactly at the same position at the XFEL imager as Monday. We needed to recheck the beamline alignment and overlap of all our beams at the interaction point. (We need to overlap in a 5x5 um2 beamspot.
Rechecked the X-ray energy. This time it was 110 eV off. The BKR number is 7.79 keV for real 7.9 keV.
Further checkes on spatial and timing overlap.
Essentially, we could recover the conditions from Tuesday evening at Thursday late afternoon.
Late evening: uTCA1 stopped working We switched the Mastertimer to uTCA2 waiting for an opportunity on Friday to solve it. We also observed an issue with an outdated trainId from the PPU being stored in the DAQ. We contacted DOC for both issues.
Late evening, series of laser shots to estimate the optimal laser conditions for the experiment.
First full data sequence collection.

Power glitch at 6:50 am on Saturday morning. HED is minimally affected, beam goes down
Beam comes back after ~1hr, but down again 30 mins later due to MPS issue (only for SASE2) which requires a server "DIXHEXPS1.3" to be reset, which could not be located.
Simultaneously SASE2 karabo broker has pile up issues resulting in extreme latency. DOC begins to work on the problem and the whole SASE 2 topic goes down, services do not reappear. We are informed that this may require a restart of the whole broker.