X-ray delivery

• 12.78 keV, ~1.3 mJ

Optical laser delivery

• 800 nm laser for jet visualization

Achievements/Observations

• Collected SFX data
• Calibration date for HIREX measured (at different X-ray energy)

X-ray delivery

12.8 keV, ~0.8 mJ

Achievements/Observations

- Data collection with fixed target

Issues

- M1 and M2 position on SPB/SFX Setpoint J was far from optimal
- Beam position in X was drifting to minus direction all time 

X-ray delivery

• 12.8 keV, 1 pulse, ~0.7 mJ

Achievements/Observations

• Except for some downtime due to beam down, majority of the time was for data collection
• 6 windows of a chip collected, with variations in shots spacing (30 um and 60 um) and rotation

Issues

• Something is still causing beam drift constantly, even though we can correct it with the feedback.

X-ray delivery

• 12.8 keV, 1-20 pulses at 47 kHz, 500-700 uJ.
• Pulse energy constantly decaying since ~3:00.

Achievements/Observations

• Continuous SFX data collection since 00:10.

Issues

• Apparent mechanical issue with one motor. To be investigated before the restart of beam delivery.
• Beam horizontal drift still present, but not as pronounced as earlier this week.

- DAQ was crashed after taking darks of AGIPD. It was solved by DOC and OCD.

- Laser could not switched from optical to RF lock. Solved by OCD (using doocs).
- Energy scan was attempted, which was not successful. 
- Seeding optimization was ongoing. It will continue tomorrow morning. Still there is intensity loss during the energy scan.
- We might see second (maybe higher) photon energy component on the beam. (https://mylog.connect.xfel.eu/#narrow/stream/201-MID_6877_UrsStaub/topic/.E2.9C.94.20Troubleshooting/near/72056)
- The beam was focused with CRL 2 arm 4 and 5. A precise beam size measurement would be useful. 
- The timing of XFEL and PP laser has been found from a frosted-YAG on the X-ray eye. T0 = 1374.94.
- The air gap between the MPC and DES are closed. 
- The first user sample is mounted and delivered in the PUMA setup.
- The spatial overlap of XFEL and PP laser has been found at the sample position with YAG crystal.
- The substrate peak (th = 20.7, tth = 41.4) was found on the fluorescent screen. 
- The SDL diamond detector was aligned on the beam, and now move it out.

 
Tomorrow
- Continuing of optimization of seeding and improving the energy scan.
- Cool down the sample and search the film peak on AGIPD.

- The seeding optimization result: Total 450 uJ (Seeding of 150 uJ  + SASE of 300 uJ).  BKR will be able to start optimization on Saturday around noon if necessary. 
- The pump-probe (PP laser and PuMa pulse) experiment data on the substrate peak was collected. 
- Found the film peak on the AGIPD. Intensity optimization was not successful. We keep losing diffraction peak intensity over the measurement time and number of pulses. We assume the X-ray-induced heating can affect the diffraction intensity.
- Rotating Phi angle by moving the manipulator Z direction helped to bring the peak out of the detector gap. 

X-ray delivery
8.951 keV, 1.2 mJ up to 30pulses at 113 kHz

Achievements/Observations
Beam trajectory at 8.951 keV
IRDa slits left/right blades connected
Sweeped pulses could be observed on fluorescent paper in front of the Downstream screen
Mirror synchronisation parameters could be found
Jungfrau halves were closed and the downstream cone installed
Background was minimised using the IRDa slits

- The seeding optimization is ongoing, which was not successful. Now we have a total of 170 uJ including SASE and seeding. 
- The option to switch to SASE is relatively not complex and can be done with the support of BKR without a seeding expert.  BKR expects to provide about (more than) 1 mJ. To be discussed with user later. 
- An investigation of the asymmetric film peak is ongoing to optimize the measurement conditions, such as diffraction angle, sample temperature dependence, and pump laser effect. Still, the PP laser effect on the diffraction peak on the asymmetric peak is unclear.  The higher sample temperature suppresses the diffraction intensity.  Unclear intensity changes over time have been observed. 
- The AGIPD moved closer to the sample to cover the more solid angle. 
- The MDL of the coupled motion of the hexapod and puma manipulator is not working reliably. 
- The delay time between the X-ray and the PP laser was cross-checked to ensure its correctness. No timing drift was confirmed. 
- Laser pump and X-ray probe experiment is being conducted at the vicinity of subtract peak. After optimizing the spatial overlap by scanning, the pump laser effect was clearly achieved. 
- The user program will be ongoing over the night. 

X-ray delivery
8.951 keV, 1.6 mJ up to 16 pulses at 113 kHz

Achievements/Observations
More than 1h of beam sweeping with lysozyme crystals
Several runs of vitamin C beam sweeping data

Issues:
Several synchronization methods were tested for the mirrors but without improving it
 

- Pump-probe experiments are being conducted using PuMa and PP laser. 
- The user program is ongoing over the night.

Tomorrow, 
- Rotating the sample phi angle. The sample holder will be retracted from the MPC.
- Search the asymmetric film peak and conduct the PuMa and PP laser experiment.

X-ray delivery

• 6 keV, ~2.8 mJ, stable delivery

Optical laser delivery

• ns laser for particle visualization

Achievements/Observations

• NKB focus optimized
• particle injection tested with gold nanoparticles
• ns laser roughly aligned with particle beam
• Julabo chiller (AGIPD) is still on target (-32 degree)

Issues

• XTD2_ATT Arm4 (600um thick CVD) is damaged (most probably last week)

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)

X-ray delivery

• 6 keV, ~2.7 mJ, stable delivery

Optical laser delivery

• ns laser for particle visualization

Achievements/Observations

• NKB focus optimized
• ns laser aligned with particle beam
• particle injector position optimized
• measured 3 samples: roughly 2 hours per each sample
• one sample was measured with and without He gas
• Julabo chiller (AGIPD) is still on target (-32 degree)

Issues

• Beam drift in vertical direction: Rz has to be corrected during the measurement and moved by 0.2 mm in total in whole day (~18 hours)

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

X-ray delivery

• 6 keV, ~3.0 mJ, stable delivery

Optical laser delivery

• ns laser for particle visualization

Achievements/Observations

• measured 1 sample roughly for 9 hours (hit rate went down in the afternoon)
• Julabo chiller (AGIPD) is still on target (-32 degree)

Issues

• NKB mirror drifted in vertical direction: it was optimized again at around 9pm
• extremely low hit rate even with sucrose (extremely few particles were observed in sidemic, 1 particle within a few seconds): maybe the aerodynamic lens should be cleaned

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 

**X-ray delivery**

- 6 keV, ~2.8 mJ, stable delivery

**Optical laser delivery**
- ns laser for particle visualization

**Achievements/Observations**
- measured user sample for almost whole day (about 100 runs x 5 minutes)
- Julabo chiller (AGIPD) is still on target (-32 degree)

**Issues**
- MKB Ion pump error (issue fixed after resetting the device)
- NKB focus loosed. Focus reoptimized twice during the d2 shift

**X-ray delivery**

- 6 keV, ~2.8 mJ, continuous beam drift in vertical direction (both XTD2 & XTD9 XGMs)

**Optical laser delivery**
- ns laser for particle visualization

**Achievements/Observations**
- measured sample for almost whole day (about 100 runs x 5 minutes)
- Julabo chiller (AGIPD) is still on target (-32 degree)

**Issues**
- Continuous beam drift in the vertical direction: NKB focus was optimized almost every 2 hours
- Sudden intensity drop in SA1 when SA2 or SA3 changes the number of pulses.

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