we were trying to make THz and cross correlate this to the pump laser.

We managed to see THz and an auto-correlation with the pump laser therein. Unfortunately we did not see any THz generation using the FEL.

Problems:

Many. Only one problem was related to the FEL: weirdly, the zeroth order of the monochromator beam was much weaker than the first order, which is worrysome.

Achievememts:

1. optimised the beam rep rate to value of 140KHz for a better signal 
2. changed nozzles and refilled the reservoir
3. Improved notebook for data analysis
4. Cammille made an online tool to see correlations between Viking and XGM --> very useful!

Night shift:

1. repeating measurements with one color with the new settings
2. following for the 2 colors plan

Achievements:

Collected more scans on cyanocobalamin, both delays scans and dynamic XAS

Issues with bad signal in beginning but good signal in the last hours

Overall successful beamtime, demonstrating new transmission/absorption setup with liquid jet and DSSC

Problems:

None

achievements

• we change the DSSC timing to record the first pulse
• sample was getting damaged with 26mJ/cm2 and scattering of the sample was changed so we used lower fluence to observe t0 on the sample
• changed to 2nd mono order, 20% GATT transmission and exit slit to 0.3 mm. The scattering signal was better
• time zero was found on the sample, 4ps from coarse timing
• dataset collected at room temperature, reproducing previous results from previous beamtime
• cooling of sample set up and started

problems

• with current setting, some pixels saturate around the DSSC central hole. This limits the X-ray fluence we can use.
• sample cooling freezed

achievements

• aligned the beam through up to the XOX imager
• prepared FFT for reflectivity measurement
• tested new DSSC gain files for Tb M5 edge

problems

• in-vacuum piezo motor for the THz parabola stopped working, venting XOX required for troubleshooting, not using the X-ray beam this night

achievements

• setup spectral encoding of the transient reflectivity in FFT
• determine coarse timing in the XOX
• fixed BOZ_Z motion and DSSC silicon oil pressure reading

problems

• nothing major

achievements

• try pumping STE membrane with FEL and detect THz emission with single shot EOS. No success.
• tried cross-polarization for a short time, no success either.
• reduced the PPL chirp to record single shot transient reflectivity data versus BAM for the night.

issues

• FEL on STE on sapphire show strong glowing so it's probably not the right regime to get THz
• we don't have a self referencing scheme to observe THz emission from PPL pump

achievements

• checked coarse timing between FEL and PPL at XOX. It had shifted significantly
• determined that light coming out of sapphire from FEL was not heating but fluorescence
• observed for the first time THz emission from STE from FEL pump on sapphire substrate and mesured with single shot EOS

issues

• FEL down for 3h

# Shift Summary

Achievements
 - Measured elastic line with 3000 l/mm and 1000 l/mm grating on NiO sample

Problems
- only 50% of trains with jungfrau data in burst mode are saved in the DAQ. Likely an issue with DAQ configuration.
- we couldn't achieve a good focus on the sample and in the spectrometer. Reason unclear.

04 Apr 2023, 07:44 we realize that the SetpointsHED Macro lost all values, probably during the Karabo Crash. Since it is a macro, the values arent stored anywhere. DOC tries to recover. Meanwhile, we found the values for 3mrad, 2.5mrad and 2mrad in old screenshots and update the macro values from that. Saving those now locally in nextcloud/user/Alex.

04 Apr 2023, 08:17 Solution by DOC: Apparently the macro CAN save the values, and that was also done during the bringupdays, but they are only saved on the GUI Server which the macro was started on, in this case GUI2. However, when Karabo was restarted, the macro was started on GUI1, so the local save files could not be retrieved. DOC copied the old save files to GUI1 now as well so we could reload the old positions for all setpoints.

Got the beam, aligned it up to the TCC, mirrors in 3 mrad configuration, checked positions for the CRLs. Energy up to 500 uJ at 8.2 keV, 2 bunches. 
Feedback M2 PBLM-2 camera was UNKNOWN. Power cycle (just switch off >> on) solved the issue. Also, the screen was extracted. Insert the screen. However, the count is too low (30 counts) to make the feedback running. We found that the trigger timing for the PBLM-2 camera was off by 20 msec with unknow reason. Then we had >~200 counts. 
The beam jitter on Zyla was quite large (~1-2x beam width).

Installed and aligned CRL4a and b. Then we pumped IC1. We realized that the M2 feedback went off two times, this needs to be checked from time to time. Otherwise no big issues, beam is mostly fine, energy is also fine.

During the night we worked on the temporal overlap between Relax laser and XFEL.

In the morning we noticed that the beam jitter is quite large (in and out of the aperture of the CRL4 lenses). There seems to be a correlation with the HED popin. We adjusted the TCC with x-ray and laser. Performed transmission scans.

We managed to see the direct beam on JF. Continued with sample alignment (grazing-incidence) and also aligned the beamblocks to block the direkt and the reflected beam.

During the night we worked on the temporal overlap between Relax laser and XFEL.

In the morning we noticed that the beam jitter is quite large (in and out of the aperture of the CRL4 lenses). There seems to be a correlation with the HED popin. We adjusted the TCC with x-ray and laser. Performed transmission scans.

We managed to see the direct beam on JF. Continued with sample alignment (grazing-incidence) and also aligned the beamblocks to block the direkt and the reflected beam.

8.2 keV, 1-2 bunches, 600uJ

23.3.

• did timing runs and optimized the beamline alignment
• Karabo was working very slow
• continued with sample alignment
• performed several xfel+laser shots
• opened the chamber and replaced samples

24.3.

• aligned xfel and Relax to TCC
• sample alignment
• taking shots

This day we had lots of issues.

• Nightshift noticed that the mirror 2 feedback was not running anymore since about 22hrs; PBLM2 cam was unknown; powercycling recovered the camera, feedback operational again.
• Continued shooting until ~9:00
• At ~9:30 the whole Karabo, online cluster were dead. No control possible anymore. Whole SASE2 was affected.
• In the meantime, BKR called us, EPS is triggered and bunch number went to zero. However, we didn't (couldn't) change anything due to the Karabo issue. It may be the side-effect of Karabo-issue.
• Karabo slowly came back at ~15:15
• DOC asked us to take test DAQ. JF4 control is stuck at INIT state and cannot take DAQ. DA08 went to error. HED Playground server cannot be restarted.... Need to solve those issues one by one.
• The remaining shift we mostly spent in restarting servers, motors, reloading configurations
• We could not start Jungfrau 4 - at some point the controller was started and has hung in INIT state for the last few hours. It doesn't respond to shutdown commands to initialise it correctly in order. We called DOC, they could restart it.

Night shift summary 21.10.2023

Achievements

• Found T0 on SiN, but the response is very slow (~10 ps).
• Azimuth (phi) scan
• Start of theta scan with optimized phi

Problems

• Even after finding T0 on SiN, still could not find T0 on sample with XAS
• Beam down at 5:25

Achievements

• knife edge scans of FEL beam, 30 um x 30 um beam size
• aligned beam stop in front of camera
• triggering pattern tested and works, still need to test with laser and XGM

Problems

• Y motor of beam stop doesn't reach the desired up position
  • had to move the entire camera instead
• Once or twice scanner Y got into error during knife edge scan, resetting the target position to the actual position and pressing move helps.
•  

Achievements

• found larger beamstop
• found center of pinhole and bender settings for beam size
• checked jitter of beam on grating, looks like jittering is large, to be further investigated offline
• checked that patterns are working for the night, to be continued by night crew

Problems

• Major problems with scanner Y, as during the previous runs. Reset axis, Reset and adjust the target position to actual position + move to get out of error.
• Problem with bunch pattern (see separate entry in Operations elog)
•  

Achievements

• Two color mode established with 11.5 GeV, 1.335 keV col1, 1.27 keV col2
• Beam size characterized using Viking + online tool
• Jet found by scanning and looking at transmitted signal on Viking

Problems

• Issue with train Id of Chem motors --> fixed by setting proper trigger
• Beam loss around 19:30 induced instability in the two color mode, slow degradation of intensity and stability until 23:00 when it was not possible to use the beam
  • Called PRC, decided to tune to single color, 1.3 keV for the night
• Jet froze