Beam drift in the horizontal direction (XTD9_XGM).

From ~16:00, X-ray beam started to drift in the horizontal direction. In total, ~0.3 mm drift observed within 2-3 hours.

Attachment 1: Beam X position in XTD2_XGM and XTD9_XGM

achievements:

- finished SAXS data recording till 8am on time-resolved skyrmion nucleation and field dependence

- the setup is sensitive to beam transport drifts due to the closed hor-SLIT and the pinhole in FFT. were able to recover beam intensity by simple adjusting the horizontal pitch of M2 ~1.5urad change during th enight 

- first initial test runs on holography performance under giving beam settings. source stability seems to work nicely. afterburner will be important for cicurlar polarizations 

problems:

no issues

achievements:

- finished SAXS data recording till 8am on time-resolved skyrmion nucleation and field dependence

- the setup is sensitive to beam transport drifts due to the closed hor-SLIT and the pinhole in FFT. were able to recover beam intensity by simple adjusting the horizontal pitch of M2 ~1.5urad change during th enight 

- first initial test runs on holography performance under giving beam settings. source stability seems to work nicely. afterburner will be important for cicurlar polarizations 

problems:

no issues

achievements:

- measured delay scans at sample tilted by 20 degree

problems:

- we saw a drop in pulse energy around 00:30 in XGM at SCS, we verified that it was not because of the FEL not going through the HSLITS, in the end after calling BKR it was realized that there was indeed a problem with BC2, after fixing this, beam pointing was recovered and pulse energy as well

- beam pointing instabilities during tuning for SA1 around 6:30

achievements:

- measured delay scans at sample tilted by 20 degree

problems:

- we saw a drop in pulse energy around 00:30 in XGM at SCS, we verified that it was not because of the FEL not going through the HSLITS, in the end after calling BKR it was realized that there was indeed a problem with BC2, after fixing this, beam pointing was recovered and pulse energy as well

- beam pointing instabilities during tuning for SA1 around 6:30

achievements:

• changed the LEPM to optimize resolution
• found 140 meV

problems:

• were not able to recover settings found because it is difficult to reproduce LEPM positions

plan:

• try to improve resolution

Night shift summary

Achievements:
- Recovered time0 on SiN (time0 moved >20ps after FEL beam loss in the evening)
- Collected static RIXS (actually with laser but negative delay) at the CDW at 113 kHz for different temperatures to investigate the effect of heating from the x-rays and from the laser

Problems:
- during late shift and after a beam dump in the evening, trRIXS signal could not be recovered. By checking the rough timing, they found a change in the x-ray arrival time of the order of >20 ps. 
- We checked the beamline alignment and found that the pointing from the machine was off, requiring BKR to tune We also found that the photon energy offset between mono and undulators changed. Beam looked horizontally diffracted and the beam pointing moved in horizontal and was hitting the horizontal slits. We translated the open horizontal slits and pitch the beam properly into SCS branch with M5.

achievements:
- Viking spectrometer set up in 8th order around 1280eV and calibrated

problems:
- problems with Viking motors. Took couple of hours to solve, Martin came on site
- problems with moving exit slit (Blade_Bottom motor does not move). Not solved by EEE on call, may be mechanical problems. Called run coordinator, XRO on call (Maurizio) is going to inspect the slit in the tunnel today. Operation of SCS relies on exit slit available (now it opened to ca. 10mm)

Achievements

• Found RIXS signal from liquid jet
• Measured static RIXS and PFY-XAS spectrum of Co(cp)(CO)2

Problems

• hRIXS detector has a data latency issue and images were not being recorded in the DAQ. This required ~2-3 hours to solve plus time lost during night shift.

Plan for Next Shift

• find temporal overlap between X-ray and laser

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

• with help from LAS OCD, we got the PPL synchronized again with optical lock and close to the initial t0 on the sample
• we found t0 on the sample again
• collected data with magnetic field
• initial setup of damnit/amore for semi-automatized data processing

problems

• no issue besides the initial loss of PPL synchronization

achievements

• finished recording dataset at 20degree
• changed for sample with smaller grains at normal incidence and moved DSSC to 1.2m
• OL induced some change of the sample but the scattering ring remains and then stabilize
• started collecting data

problems

• issue with jupyter notebook slow processing. Asked DOC for 10 additional reserved nodes. Also found issue that 100's of Mb or error messages are saved in the jupyter notebook and found a solution to supress them https://in.xfel.eu/elog/3360+Duerr/92

achievements

• exchanged He dewar and managed to cool down the sample again after vacuum issue last night
• started collecting additional scattering data with alternating magnetic field on large nanoparticles sample

problems

• no issues

Achievements:

• measured the new sample, Silane, with different time delays

Problems

• Tuning of SASE2 led to a 50% decrease in the SCS XGM intensity without affecting the SASE3 intensity. It also caused a jump in the BAM value

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

2 color mode

Achievements

• Fluence scan
• delay scan to identify cross talk of two colors
• Optimized beam size

Problems

• Struggle to find the expected signal when scanning color 2 energy
  • Optimized conditions

Plan for the rest of the night

• Repeat energy scan with optimized conditions
• Maybe try at a different delay

19 Feb 2023,15:30 Shift handover

Runs will be added in the general Elog for data runs and acqusitions (Elog-4)

- alignment of new wires to shoot with relax laser
- pump probe X-ray imaging with CRL4-a  (DAQ runs 306-320)
- realignment of CRL4b to compare data with CRL4-a imaging capabilities
- resolution check with X-ray only runs on siemens star (DAQ runs 321-323)
- shots with crlb (DAQ runs 324-347)

19 Feb 2023, 19:53 : DAQ crashed
19 Feb 2023, 19:56 : DAQ revived after restarting it
19 Feb 2023, 20:36 : All remaining wire are shot. We pass to shock target. Instead of doing side-on radiographs we go to face-on scheme (radiography colinear to the shock propagation.) |
19 Feb 2023, 20:40 : shock target alignement
19 Feb 2023, 22:16 : Shock targets shots (DAQ runs 348-390)
                                               Beautiful pictures here!!!!!!

Resumen of the shift: align and shoot, with beautiful images at the end (which was the main goal of the beamtime this week) .

Last night shift tasks :
- getting final siemens star and free beam radiographs with CRL4b (to see if the resolution keep consistant over time: it should be, but it is better to check it)
- Go back to CRL4a
- go as far as possible from tcc, and do edge scans with Ni foil (the one juste on top of NTT grid)
            - do refined edge scans every 5mm all along the travel range of CRL4a
- for next week, PAM time =0 needs to be as precise as possible, preparation of PAM for next beamtime.
- Going through Bspec data acquired today
 

achievements:

• knife edge scans of OL to find lens position corresponding to the smallest beam size
• knife edge scans of FEL to determine the position to proceed for spatial overlap
• liquid jet was set up and it's running since afternoon
• measured x-ray absortion via the diode in the CHEM-DIAG

problems:

• difficult to perform knife edge using 3 um after finding rough spatial overlap useing the green laser. The issue is the following: becasue the diode does not see the direct OL beam but rather we see scattered light at the diode, even when the direct beam is blocked by the sample holder
• since spatial ovelap cannot be found we siwtch program
• APD voltage device goes into error above 310 V and at 310 V after some minutes it goes also into error ->
• the APD signal shows strong fluctations in the background

Achievements:

- we replaced broken SMA cable, and added an angle-connector at sample holder to aid the sample rotation when moving diagnostics to the flat jet

- we double-checked coarse timing and x-ray beam size

- we found t0 on SiN

- setting up RIXS with time delay steps for the night shift program