optimization of seeding (still not as good as needed)

set position for the two color mode (difference 3-4 ev)

timing of the direct beam with diode and laser
timing of the direct beam with YAG and laser
alignment of the lower branch of the SDL
timing pf the lower branch beam with YAG and laser

issues:
intensity and spectral purity of the seeded beam not really good
alignment of the mirrors have been tricky (previous values did not work)
 

optimized the SDL alignment

found timing of the upper (-520 ps) and lower branch (-514.5 ps) of the SDL

moved the upper branch by 3 ps (positive) and lost the beam on the merger crystal - difficult to get it back

Found the delay time from upper and lower branches of SDL with a frosted-YAG.
The upper branch is -512.8 and the lower branch is -513.28.
The delay time difference is about 500 fs. 
The Mid SDL delay tuner should be investigated further more. 
The next step is find the spatial overlap on the Suna microscope and measure the fringes. 
 

Started the day with vacuum & detector issues
real start of the experiments only at about 6 p.m. 
measurement of a selection of samples (urea, ludox) using the levitation device

issues: vacuum (behind AGIPD), motor (bend2 of the DES was in error - used for the beamstop)

started initial alignment for the ptycho experiment 
Continued with XPCS measurement using the levitation device

issues: contribution of the 2nd harmonic of 8 keV at 16 keV visible on the Jungfrau detector - surpressing via mirror alignment not successful

continued with the evaluation of the XPCS analysis packages
investigated the effect of alignment optimizations and forced misalignments on the contrast directly with the online XPCS tool
checked additional standard samples 

01:49

Worked on the XPCS analysis packages
measured the TetraPack samples
continued with the levitation device

issues:

1. Jungfrau detector had an error - R. Shayduk restarted the device - it should be power cycled as described in the manual
2. The bunch number selctor does not work - the system didn't accepted 150 pulse but moved it back to 30 pulses - the machine switched off the user selection - should be followed up tomorrow

data collection of bubbles in elastomers (good progress)

issue: beam loss in the tunnel during the day - experts checked the situation and the situation improved during the evening

successful measurements of elastomer, gelatine & bio samples

issue:
beam loss at about 2:45 due to communication issues with accelerator modules

Staff: JK, SB, JE, AS, RW, FK

**X-ray delivery:**
- 21 keV, ~500 uJ

**Optical Laser:**
- None

**Achievements / Observations:**
- Measured several Schimadzu runs

**Issues**:
- the beam intensity was fluctuating significantly during the day; 
- Changed the objective of Schimadzu for wider field then the controller stopped working which took over 1 h; before starting working again.
- One of the attenuators has features on the scene; Si 3200

X-ray delivery

• 9.3 keV, 3.3 mJ, 190 pulses/train

Optical later delivery

• For jet illumination

Achievements/Observations

• Aligned NKB mirrors, slits
• Collected 8 adaptive gain and 22 fixed medium gain runs with lysozyme
• Collected Copper foil flatfield data and glass scattering with different attenuation and sample-to-detector distances

Issues

• XTD2 attenuator watchdog limited the number of pulses to ~190 with XTD2 CVD inserted

X-ray delivery

• 9.3 keV, 3.3 mJ, 190 pulses/train

Optical later delivery

• For jet illumination

Achievements/Observations

• Aligned NKB mirrors, slits again
• Removed the AGIPD shield
• Moved slit3 and slit4 to a fresh position after damage

Issues

• Litframe finder blocked collecting dark images for AGIPD. The problem was solved after resetting the Litframe finder.
• Slit3 and slit4 were damaged

X-ray delivery

- 9.3 keV, 3.1 mJ, 214 pulses/train at 1.1 MHz and 132 at 0.5 MHz

Optical later delivery
- For jet illumination

Achievements/Observations
- Aligned IRU_SLIT-3 again
- Collected PCS data in fixed MG: a lot of diffraction for 5458, only very few for 7559.
- Collected Lysozyme data in fixed MG and adaptive gain.

Issues
- IRU_SLIT-3 right blade was too close to the beam. Physically shifted it by a few mm towards the dark side and improvised lead aperture added between IRU_SLIT-3 and inlinemic.
- LitFrameFinder cannot recognize dark runs for fixed medium gain. One needs to check box Disable DAQ Filtering (on LitFrameFinder scene) or enable Global Passthrough Mode in LitFrameFinder properties, when takes darks for fixed MG.

MID operation limited to 55 bunches by SA2_XTD1_OPTICS_PROTECTION/MDL/ATT1 because of inserted Si 0.5mm. Seems a bit too tight for 1mJ@17keV, since diamond is not so usefull at this photon energy anymore.

The jumps keep repeating very frequently since yesterday afternoon. The overall drift of the beam seems to accalerate as well.

And since the 4th there are some instabilities in the vacuum levels at M1 and M2 as well.

X-ray delivery
9.10 keV; 190 pulses per train @1.1 MHz with roughly 140-200 uJ; observed some fluctuation in the photon flux

Optical laser delivery
ns laser for particles visualization

Achievements/Observations

• Beam optimization and characterization
• X-ray focus FWHM calculation found to have a bug in pixel size used
• Sample injection and data collection for >10 hours
• collected data on copper cubes with average hit rates of ~5%

Issues

• DAQ - multiple crashes and restarts needed throughout the shift; at certain point we encountered three crashes within less than an hour; and called DAQ to intervene
• Gotthard II at Hirex stopped acquiring and we had to change the number of the acquisition time to ~10 days to allow continuous running until the end of the beamtime.
• hit rates were low and sonication of samples needed to be done several time to prevent clogging issues
• Focus drift - we observed significant drift in the beam; a refocus then had to be check several times to focus back the beam to nm
• beam intensity fluctuated a lot during the shift