X-ray delivery

• 10.65 keV, up to 339 pulses at 1.13 MHz, 1.6-1.8 mJ.
• 12.4 keV, up to 30 pulses at 1.13 MHz, 1.0-1.2 mJ.
• Beam not aligned to the crosshair at 12.4 keV, but we could work with it as it is to avoid further tuning.
• Overall stable delivery.

Optical laser delivery

• NA

Achievements/Observations

• Thermal measurements with Be and Al CRLs under various conditions.
• Performed test with SQS to determine the effect changing number of SASE1 bunches. Upon changing from 339 to 30 bunches at 1.13 MHz, the pump-probe signal in SQS decreased by ~30% and partially recovered within a few minutes, but was at not point lost. Clearly, the decision made yesterday that prevented us to use the beam over the last two hours of the shift and to complete our programme was not based on solid evidence.
• Setup and alignment of IRDa in preparation for next week.

Issues

• Photon energy was changed from 12.4 to 12.0 keV shortly after 23:00 while we were still using the beam.

beam parameters: 20 keV, 300 uJ, 352 pulses

• continuation of user programe.
• Machine performance very good for trying the 20 keV the first time. Experiment also going well.

X-ray delivery

• 12.2-12.45 keV, up to 339 pulses at 1.13 MHz, 0.8-1.2 mJ.
• Couple of minutes beam interruption.

Optical laser delivery

• NA

Achievements/Observations

• Calibration of XPD's CAL/LPM at 12.4 keV.
• Measurement of CRLs transmission with LPM.
• Realignment of CRL chamber and all arms.
• Realignment of IRDa components and focus optimisation. Optimal focus with 17 lenses at 12.38 keV.
• Installation of remaining IRDa components: side microscope and flight tube.
• References taken in both IRDa's microscopes for laser setup next week.

Issues

• None.

*Vacuum issues: There seems to be a leak in the arm nr. 6 (2.4mm CVD Diamond). This has escalated to trip several times the vacuum sector interlock. VAC will do an intervention to XTD1 with broken interlock tomorrow morning starting 9am to remove arm 6 permanently and putting a blind flange instead. 
*We can measure for today with the 2.4mm CVD Diamond inserted into the beam.
*Measurements on Vycor and glass samples with different attenuation at and repetition rate (2.2 and 4.5 MHz)
*A25 trip at 1:14, after some intervention we get the beam back at 2:12

Staff: DZ, AR, MK

X-ray delivery

• 12.42 keV 169 pulses for alignment 16 pulses for data collection. stable delivery excluding the extended interuption

Optical laser delivery

• none

Achievements/Observations

• Continuation of lysozyme experiment with parameters from yesterday
• data collection time limited by machine downtime, alignment optimisaiton and cleaning of the sample buildup around the interaciton region.

* Data collection of vycor and glass samples in SAXS geometry until 9am

* Successful intervention on SA2_XTD1_ATT arm 6 by the vacuum group, see elog entry 237 by Raoul and Bianca . Thanks!

* Simultaneous CoC in the MID hutch to WAXS geometry.

* Beam back for tuning around 4:30pm, HXRSS tuning still ongoing

X-ray delivery

• 12.42 keV, 0.8 mJ/pulse, stable delivery

Optical laser delivery

• none

Achievements/Observations

• BG optimized (1-2 photons)
• Realignment of offset mirrors (M1 & M2), cube, straw, sidemic
• Jungfrau4M timing checked and optimized for single memory cell operation
• About 2 hours data collection

Issues

• Low pulse energy (Tomorrow, BKR and we should optimize the pulse energy)
• Extremely slow data calibration (it took more than 1 hour for 10 minutes run)

* First half of the day was used to optimize seeding performance
* Cryo issues started at 6 pm; were resolved by 9:30pm
* After some tuning, we observed very nice seeding performance around midnight (ratio better than 1:1)
* Beam size seems too big; we measured 25x25 um w/ knife edge scans and CRL2 lenses 3,5,6
* Mounted the x-ray again, and left the chamber pumping overnight
* Morning crew, please double-check the beam size tomorrow

X-ray delivery

• 12.42 keV, 0.65 mJ/pulse, low pulse energy but mostly stable delivery

Optical laser delivery

• none

Achievements/Observations

• Unit photon flux increased by bending M2 bender more although incident pulse energy was about 0.65 mJ/pulse (10-20% lower then yesterday)
• Long data collection (4.5 hours) although we had rather low hit rate
• SideMic position and focus optimized in the end of the shift

Issues

• Even lower pulse energy (M2 bender helped a bit), any improvement will be helpful for Sun. night shift

*Some more tuning of HXRSS and focus optimization in the morning.

*XPCS data taken in WAXS geometry on different glass samples.

*Migration of data is clogging up after about 10pm. DRC was contacted.

*Beam loss at 1am due to lost connection to TD5, MPS shut off beam in SA2.

X-ray delivery

• 12.42 keV, stable delivery with slightly less than 1.0 mJ/pulse (~0.95 mJ/pulse)

Optical laser delivery

• none

Achievements/Observations

• BKR semi-optimized photon flux by ~20% more then yesterday)
• Long data collection (5 hours) although we still had rather low hit rate with ligand (hit rate was higher without ligand)

Issues

• Beam pointing issue (only relavent to SPB_EHC_CRL) after BKR semi-optimize photon flux
• Rather low hit rate due to flux, crystal size, ligand, etc.

beam: 18 keV, 352 pulses, ~200 uJ per pulse

achievements:

• AGIPD timing scans, AGIPD darks.
• beam alignment, CRL3 focusing, prep for the user beamtime

beam conditions:

• beam is jittering in position and pulse energies are on the lower end. The pulse train in decreasing in intensity

18 keV, 150 uJ per pulse, 2.2 MHz

• continuing user program proposal 3285
• X-ray heating and laser heating samples in DACs
• using only the first 200 pulses of the train as the intensity after decreases fast, conversion of the samples is difficult due to low pulse energies

X-ray delivery

• 12.42 keV, stable delivery in single pulse mode with 1.9 mJ/pulse

Optical laser delivery

• 532 nm ns-laser for sample pumping

Achievements/Observations

• Collected protein crystal diffraction for three different samples with varying laser delay and fluence. LCP viscous jet sample delivery.
• Stable CRL focus using tunnel collimation with 3 XTD2 lenses followed by 17 focusing lenses in SPB hutch. 2 um FWHM focus with <1um standard deviation in 'X' position.
  • 3 XTD2 lenses gives a round X-ray beam approx 1 mm in size, such that we are almost overfilling the CRL apertues in SPB.

Issues

• Some initial jetting issues, which have now been solved.

Beam 18 keV, 0.5 MHz, long trains up to ~280 pulses

• change setup to dynamic DAC
• prep for user beamtime: alignment of X-rays, focusing (~40 um), train-on-demand for long trains, transmission runs
• darks, XRD calibrations for AGIPD

Issues:

• AGIPD may need a timing scan
• trains decreasing in intensity rapidly

• concluded user experiment on dynamically compressed water
• long train operation worked relatively stable with no major interuptions in beam delivery

9.3 keV, 1-35pulses, stable delivery ~600uJ
*General alignment of MID branch to the DES
*Commissioning of CRL2 (MID_XTD6_CRL) together with EEE after change to close loop in the maintenance period and alignment of lenses, characterization of beamsize using the X-ray eye at the sample position.
*Alignment of spectrometer in DES

9 and 10keV beam, up to 30 bunches, significant drop in intensity in the morning and in the evening.

Activities:

Commissioning of EH MIRR device

Preparation of user experiment at 10keV with lenses and monochromator

X-ray delivery

• 9.3 keV, 1-202 pulses at 1.13 MHz, 1.9-2.1 mJ.
• Overall stable delivery.
• L-IBFB could not be activated due to missing missing transfer matrix elements. Missing parameters entered by the expert who happened to be on shift this morning.

Optical laser delivery

• 800 nm, 50 fs, 564 kHz. Overlall stable delivery.

Achievements/Observations

• Installation and alignment of fixed target sample.
• Coarse timing of PP laser.
• Found diffraction of sample.

Issues

• Retracted CRL positions in MDL SA1_XTD2_CRL/MDL/CRL are not up-to-date and do not drive the CRLs to the "out" switch.
• PP laser OXC synchronisation signal dropped out a couple of times. LbSync and LAS informed.

Achievements

• Measured XAS and RIXS from NdNiO3 test sample at 230 K

Plan for next shift

• Measure test sample at 20K
• Find timing between X-ray and laser and look for transient signal