X-ray delivery

• 0.25nC, 14 GeV, rep rate 2.25 MHz, 9300 eV, 1 to 100 pulses, ~2000 uJ
• M1 and M2 mirrors are aligned and beam trajectory to SPB.

Goal

• Commissioning of the Gotthard-II 25um MHz detector on SA1-HIREX.

Achievements

• Aligned the HIREX using bent diamond crystal C110 and no gratings used.
• 2D camera(Bragg/photonic science) aligned and spectral data is collected.
• Trigger delay scan of Gotthard-II detector. The best trigger delay setting was found at 1952637.
• Calibration Pipeline is established and can load/inject the constants
• Online preview of Gotthard-II corrected data is successfully tested and commissioned.
• successfully able to load calibration constants and dark runs in myMDC.
• Successfully able to start the calibrated data after completion of runs in myMDC.
• Calibration/corrected and dark data reports are successfully generated in the proposals
• New filter stage commissioned and tested. Updated the positions in the MDL.
• Intensity scan output for strips 2150 and 2151, obtained varying the SA1 diamond attenuators. I_0 is calculated integrating the output from strip 2000 to strip 2300.
• Different gain setting data was collected.
• Gotthard-II tested and commissioned with different rep. rate: 4.5 MHz, 2.25 MHz, 1.125 MHz, 0.5 MHz. The test was sucessfull and we can record spectrum for different rep. rate.
• There are no visible aritfacts around the gain switching region, and the correction seems to work well.
• spectral data is collected with 2.25 MHz with pulses 2, 30 and 100.
• Attachment 1: Fisrt results from Gotthard-II with spectral data in MHz rep rate.

Issues:

• Calibration pipeline of pulses/train (ASSEMBLE_STREAK) couldn't able to instance. DRC and OCD DA group helped to fix (Thank you)
• Adhoc data sources were added in SA1 COMM with support from DRC and CTRL (Thank you)
• beam lost at ~12:30hr today due magnets issues and till now no beam. Unable to continue the rest of the program planned for commissioned of the Gotthard-II.

Thanks to Marco, Jiaghuo, DRC(Monica), CTRL OCD (Andrea), DA OCD (Karim) for there support and help.

*Achievements :
- Generally rather successful with very high quality beam parameters
- We had a nearly steady 800 uJ+ HXRSS flux during the user run and ~ 4mJ SASE during the setup at HED.
- Beampointing was rather stable throughout the HXRSS operation.
- Users took several shots (>2600 FEL and FEL+ReLAX shots) on target. The beamline setup was very quick prior to that and users were able to get preliminary data to prototype parameters already a day before formal handover to them and could straight go to harvest mode on Saturday morning.  
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* Issues :
- Users still found large Bremsstrahlung fluxes on their background, but this is rather on our side, in conjunction with the users.
- On the last day, we had issues with JF calibrations due to the high run numbers in the proposal. DOC promptly helped out.  
- Initially, we observed fluctuations in the FEL flux. BKR was very prompt to correct for this and user operation was not impacted seriously. Slow drifts in pulse energy were also observed, but again, could be compensated from time to time by them.
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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 has not been delivered consistently throughtout the experiment (eventually we gave up due to the average low pulse energies)

We plan to put the piezos of M2 off, in the (unprobable) case that this is the reason of the "jumps" in SASE3 trajectory.

Therefore, I measured the change on RY and RZ motors, to correct all the positions

Fig 1: initial position, Motors Ry=10.5425 and RZ=-14.7200  Piezo Ry =5 and Rz=5

Fig 2: Ry is compensated, Motors Ry=10.4990 and RZ=-14.72  Piezo Ry =0 and Rz=5

Fig 3: Rz is compensated, Motors Ry=10.4990 and RZ=-14.7574  Piezo Ry =0 and Rz=0

Differential values: RY needs to be adjusted by -0.0435 and Rz by -0.0374

EPS Interlock change for Mode30:
the 3 HIREX Interlock conditions had been disabled

We had some trouble with the DAQ. It was not able to start runs properly.

We got the following error messages:

initially:

[00:01:27]: Problem of communication with data manager

[00:01:30]: Start new run ...

[00:01:38]: Failed starting data recording

DM: error at registerRun (Request to MDC timeouted)

after trying to start the run again:

[00:05:35]: Start new run ...

[00:05:35]: Failed starting data recording

DM: error at registerRun (Problem of communication with MDC

#Info: MDC-1100: MDC web server error: Error creating run

#Details: {'run_number': ['must be unique per proposal', 'has already been taken'], 'experiment_id': ['has already been taken']})

Cycling the DAQ resolved the issue.