Achievements:

-Re-alighned beam transport from the FEL soource as we seen low phon counts on the spectrometer

-Optimized spectrometer at 1000l/mm grating

-Made energy and curvature calibration

Problems:

-No major problems

Achievements:

1. Replaced focusing lens of PP laser and measured focus with knife edge, focus is about 720 micron vert. & 600 horizontal. Horizontal x-ray spot size is 220 micron
2. Adapted fluence calibration for the new spot sizes
3. Optimized spatial and temporal overlap with new lens
4. Performed optical and x-ray intensity & sample damage tests. We found that up to 15% GATT and up to 50% laser power are okay to use, without altering the sample.
5. We started to collect hRIXS data at positive (1ps) and negative (-2ps) delays.

Problems:

1. Few beam dumps.
2. BAM scene not working
3. The new (?) centroiding function produces spectra with different intensity for acquisitions with the same settings. The old algorithm seems to work well.

Achievements

1. Acquired tr-RIXS data with 4.0 mJ/cm² laser power for 21 delays between -2 and +10 ps at 853 eV. including static XAS and dark hRIXS runs. Totally collected 210 minutes of data i.e. 10 minutes per delay
2. Acquired tr-RIXS data with 4.0 mJ/cm² laser power for 21 delays between -2 and +10 ps at 853.44 eV. including static XAS and dark hRIXS runs. Totally collected 210 minutes of data i.e. 10 minutes per delay

Problems:

1. hRIXS camera number of readout ports was set to 1, increasing the readout time. Set it to 2.
2. Elastic line drifted about 40 meV over 3 hours (first and last trRIXS run at 853)

Achivments:

- X-ray and Laset spot size calibration

- Course timing check

- Adjusting the DSSC distance

Problems

- Problems with DSSC data recording. It seems like DSSC dont see the first x-ray pulse. It makes offlin analysis tools to give an error.

Achievements
-Check XAS and static RIXS after the beam was back
-Do the warm up cycle to remove ice from the sample surface
-Check coarse timing after the beam drop
Problems
-Could not see the fine timing signal so far

In the public status display, it looks like FXE is taking the beam even though their shutter is closed.

When using 1.13 MHz X-ray repetition rate, SASE1 HIREX is capturing two pulses in a single frame giving the impression that there are more peaks within the spectrum than there are in reality.

This was verified by recording data with one and  two pulses per train, which are shown in attachment.

The spectral integral/intensity in GOTTHARD frame 6, the first with data, is twice larger with two pulses compared to one pulse per train (attachments 1 and 2).

The number of peaks is consistently higher with two pulses compared to one pulse (attachment 3).

After SASE1 HIREX GOTTHARD reconfiguration, we now get a single pulse per frame. This was verified by comparing data from HIREX recorded with 564 kHz and 1.13 MHz X-ray repetition rates. Both intensity and number of peaks is comparable for the two repetition rates.

X-ray delivery

• 12.0 keV, 1.3 mJ, 1-168 pulses @ 564 kHz
• Decaying intensity between 1:20 and 2:40, otherwise stable delivery.

Optical laser delivery

• 1030 nm compressed, THG
• Stable delivery

Achievements/Observations

• Optimised PP laser THG conversion efficiency.
• PP laser spatial and temporal overlap with water jet.
• Collected lysozyme diffraction for detector geometry.

X-ray delivery

• 12.0 keV, 1.3 mJ, 1-168 pulses @ 564 kHz.
• Stable delivery.

Optical laser delivery

• 1030 nm compressed, THG.
• Stable delivery.

Achievements/Observations

• Collected static and TR-SFX data.

X-ray delivery

• 12.0 keV, 1.3 mJ, 1-168 pulses @ 564 kHz
• Cryo issue at 3:33

Optical laser delivery

• 1030 nm compressed, THG.
• Stable delivery.

Achievements/Observations

• Collected TR-SFX data. Smooth sample jetting.

Issues

• Beam down, shift ended earlier.

X-ray delivery

• 9.3 keV, 1.8 mJ, 202 pulses most fo the day. Pronounced (~30-40%) slope across the train.
• Pointing initially far off the reference crosshair. One hour required at the start of the shift to go to 9.3 keV and align the beam to the crosshair.

Optical laser delivery

• NA

Achievements/Observations

• Collected diffraction from user calibration sample for detector geometry.
• Screened a variety of user samples and collected datasets with those showing clear diffraction.

Issues

• Pressure spike in MKB_PSLIT area.
• Various issue with several user nozzles.

X-ray delivery

• 9.3 keV, 1.6 mJ, 202 pulses msot of the day.
• Slope across the train reduced comapred to yesterday, now about 25%.
• Changes in number of pulses in SASE3 not always automatically picked-up by kickers adaptation and requiring a nudge from BKR to restore performances.
• Beam down for ~35 minutes early morning, but otherwise stable delivery.

Optical laser delivery

• NA

Achievements/Observations

• Collected SFX data from 10 user samples, including at different detector distances for a few of them. Up to 10% hit rate observed.

Issues

• Still issues with nozzles: gas leak, EtOH leak.
• Multiple ASICs of AGIPD exhibit a jumping offset. Power cycle initiated at the end of the shift.

X-ray delivery

• 9.3 keV, 1.4-1.8 mJ and 12 keV, 1.1 mJ. 202 pulses most of the day.
• Reduced slope after afternoon tuning, down to 20%.
• Change to 12 keV with file prepared earlier this week did not work (no lasing). Tuning to 12 keV took 40 minutes.
• 30 minutes downtime in the morning.

Optical laser delivery

• NA

Achievements/Observations

• Optimised slits to protect the nozzle from X-ray damage.
• Collected data with a dozen of user samples. High hit rate and resolution achieved with some of them.

Issues

• No major issues.

X-ray delivery

• 9.3 keV, 1.8 mJ, 202 pulses most of the day.
• Attempted tuning to 14.8 keV during the first hour fo the shift did not work out. More time will be spent tomorrow morning tuning to that photon energy.
• Overall stable delivery. Only a magnet failure at 20:25 resulted in a drop of energy and was quickly recovered. Interestingly, during that time the slope through the train was reduced.

Optical laser delivery

• NA

Achievements/Observations

• Collected diffraction data from multiple samples, including mixing at different delays. Smooth sailing with the same nozzle for the entire day.

Issues

• Run controller and data manager crashed around 23:00 just as we were about to collect data from the last sample. Both devices were reinstantiated.

X-ray delivery

• 10.7 keV, up to 339 pulses at 1.1 MHz.
• Large slope through the train, up to 70% with 339 bunches. BKR was not able to find the cause so far, we agreed to pursue this further tomorrow.

Achievements/Observations

• Timing optimisation of FLIR camera.
• Heating measurement of Al and Be CRLs with FLIR camera and thermocouples.

X-ray delivery

• 10.65 keV, 128 pulses at 1.13 MHz and 16 pusles at 141 kHz.
• Slope reduced at the start of the shift. Approximately 20% slope after that with the patterns used for data collection today.

Optical laser delivery

• NA

Achievements/Observations

• Spectrometer setup and aligned. Collected first data with GOTTHARD II.
• Measured multiple static samples with Bragg magnifier.

Issues

• No issues.

X-ray delivery

• 10.65 keV, 128 pulses at 1.13 MHz and 16 pusles at 141 kHz.
• Overall stable delivery.

Optical laser delivery

• 800 nm, 50 fs, 1-226 pulses at 1.13 MHz.
• A few issues with minor impact on operation this week. Detail communicated to LAS.

Achievements/Observations

• Continued characterisation of crystals (thermal measurement, interferometry, imaging) under different beam conditions ranging from direct to focused beam.
• Spectral measurement in parallel to crystals characterisation.
• Imaging of static samples with Bragg magnifier.

Issues

• DAQ configuration failing multiple times. Repeating the same sequence of actions yield variable results.
  • Several times with unhelpful message "Failed to execute "assign" action".
  • On one occasion with the message "Assignment for data-source/group 'SPB_CFEL_JF1M/DET/JNGFR09:daqOutput'/'SPB_CFEL_JF1M_9' not specified." even though we used this group before without any issues.
• JUNGFRAU 1M acquisition could not be stopped. Restarting control and receiver servers and associated devices resulted in the control device being stuck in INIT state. Detector had to be power cycled to solved the issue.

X-ray delivery

• 10.65 keV, 128 pulses at 1.13 MHz, 1.6-1.7 mJ.
• Overall stable delivery.

Optical laser delivery

• 800 nm, 50 fs, 226 pulses at 1.13 MHz.

Achievements/Observations

• Continued characterisation of crystals (thermal measurement, interferometry, imaging) under different beam conditions ranging from direct to focused beam.
• Spectral measurement in parallel to crystals characterisation.
• Imaging of static samples with Zyla and Shimadzu.

Issues

• We were not able to complete the last part of our programme since we were not allowed to change the number of bunches and repetition rate. Measurement ended at 21:00 and last two hours fo the shift were spent in discussion with SQS/BKR/RC/PRC with no positive outcome.

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.