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

Achievements:
-Collecting TR-RIXS data for different fluencies and delay range
Problems
-No major problems

Activities:

• Measured tr-RIXS spectra on user sample in silane solvent

Problems:

• Sometimes the PPL shutter cannot be opened from the control room after searching the hutch.

Activities:

• continued tr-RIXS scans
• tried to find ways to mitigate the energy drifts of the mono (see below)
• confirmed in user data that the FEL-PPL timing was not changing (see below)
• setting up for tr-RIXS at beginning of night shift

Problems:

• the mono energy has been drifting, presumably due to warming of the grating.
• automatic correction of the elastic line in the RIXS data was not working reliably
• we suspected a timing drift, but it seems that the monitor (photodiode + oscilloscope) itself is drifting. That's a new one.

Achivments:

-Move DSSC closer to the sample.

-Measure delay scans for opposite magnetic field.

Problems:

-No major problems

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

Achivments:

-Measure delay scans at two PPL fluencies on smaller grain size.

-Moved DSSC back to 1.45 m sample - detector distance

Problems

-No major problems

Achievements:

- Find course timing with antenna

-Find find timing signla with TR_XAS on the sample

-Measure XAS with laser ON and OFF to find optimal conditions for TR study

-Measure TR_XAS at low T

Problems:

-temperature went up and the cooling was not responing to the change of needle valve. When we tweak a bit transfer line needle valve cooling starts again.

Achivments:

-Measure time scans with magnetic field in opposite directions

Problems

-At some point data analysis was imposible. No reseurses could be dedicated for the analysis. We switch both AMORE and offline analysis to nodes, dedicated for the proposal.

-We found very slow drift of xray intensity at XGM. It was becasue x-ray pointing was slightly changed. We restore the pointing with M2 pitch motor

Achievments

-RIXS scans at different delay times and x-ray energies

-Cross check fine timing

Problems

-Nozzle was frozen. Pump was in error state.

Achivements:

-Cooling down the sample. Sample is at 14K

-Taking time resolved data at 70%  800 nm, -5 ps  - 65 ps

Problems

-Freezing of the transfer line while cooling. It seems the scroll pump was brocken. When we replace the pump cooling was OK.

Achievments:

- Align DPS to remove clipping of X-rays

- Get better focusing of PPL in the chamber

-Coarse timing with SIGNAl of OPA

-Switch back to 3 um PPL settings

Problems

-It was hard to work with DPS without motorized stages

achievements:

• change the optical laser to 2 um
• found focus of 2 um beam
• found saptial overlap
• course timing was checked
• looking for fine timing using SiN

problems:

• fine timing signal not seen yet

22 Mar 2023, 17:08 started the log, the aim for the shift is the alignment of the sample and source point measurement. In addition to that, we also plan to check the Greateyes camera.

22 Mar 2023, 17:53 continuing the sample alignment

22 Mar 2023, 17:54 SAMP_AY is the clockwise direction looking from the top. Positive is towards the smaller incident angles.

22 Mar 2023, 17:57 By moving negative in the coordinated move we brought the sample towards the sliding door when the direction is 90°.

0deg_-alignment-FS.png shows blocking the x-ray beam with the sample.

22 Mar 2023, 18:13 We moved the target paralell to the XFEL beam so that we can either see the direct beam or we block the beam with the target. The next step is to block half of the beam with the target.

direct-beam-0deg.png shows the beam passing by the sample.

22 Mar 2023, 18:39 New zero position is found as on the screenshot New_zero_position_2023-03-22_18-39-16.png 

22 Mar 2023, 19:31 A clear Specular reflection is seen (c.f. Specular_and_reflected_beam_2023-03-22_19-22-19). We now do the angle per px calibration.

22 Mar 2023, 19:35 Specular reflection moves by 41 px for 0.02 deg rotation of the Samp_AY stage. Hence, 20px/0.01deg = 0.00049deg/px

22 Mar 2023, 19:37 We move by 113p = 0.055 deg on Samp_Ay to see the direct beam w.r.t the original sample position. We now move Coordinated motion.

22 Mar 2023, 19:43 Sample aligned parallel to the FEL beam - screenhot attached

22 Mar 2023, 19:48 Sample aligned to an AOI of 0.5 degrees. Screenshot attached. Remember the 2theta shift in the beam angle when the sample stage is rotated by theta. (c,f, AoI_0p25deg_2023-03-22_19-48-29.png - note the angle in file name corresponds to SampAy). Aligned position of the sample is FS_nearbottom_aligned_0.5deg_22032023. This position should be close to the edge at the bottom part of the sample.

22 Mar 2023, 20:54 Direct and Specular beamstops were aligned roughly with ALAS with the IC1 open by CB. We noticed that the breadboard of the specular beamstop motor is not fixed. We now check if this position is fine with the FEL beam without IC1 being pumped. CRL4a shall be driven inside to align this better from the control room.\

22 Mar 2023, 21:52 Direct beam stop was aligned with FEL beam. Specular beamstop was aligned horizontally. Specular vertical axis is only roughly centered.

22 Mar 2023, 22:25 Adjusted c-slits since they were clipping the beam before. p-slits are aligned as well.

22 Mar 2023, 22:48 Now we try to see something on the Greateyes. We bring in Relax alignment laser. Removed filters in IC1, free position in spectrometer. Switched off sensor power. Please insert the filters again before any laser shots!

22 Mar 2023, 23:10 We see something, but not clear what it is. Att. #7

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

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.

17 Feb 2023, 17:15 : We centered Pin in the FEL beam and then imaged this pin with ILM and FSI to get common references.
                                 We corected astigmatism with OAP
                                 Then we introduced CRLb into the X-ray beam path and centered the CRLb to the beam axis.
                                 Then we translated crlb to to sharpen the image of the pin (i.e. meaning we are in imaging plan of CRLb).
                                 Aligned positions for crlb are:
                                   - detm20=56.069mm (longitudinal translation to the X-ray beam)
                                   - detm21= 27.322
                                   - hexapod:
                                              - x =   0.000   /  y=  0.000    / z= 0.040
                                              - u =  -0.250   / v=  0.000     /w = 0.260
                                   - image of the pin in CRLb can be found in att-1 7 att-2 (more zoomed)
                                   - sad that there is a weird halo due to CRL imperfections around the center fo the FOV.
                                   - Few free beam shots will need to be taken to be able to substract such structures in postprocessed images.
17 Feb 2023, 17:37 : We now move toward the Siemens star to optimize the definition of the focal plan of CRLb, and estimate the FOV (siemens start diameter being about 50um diameter)
                                 Adjusted position of detm20 to have the samples in the imaging plane of CRLb is: detm20 = 63.07mm
                                 We take a run to image the Siemens Star. It seems that resolution may be better than 1um, and we start to see the numbers.

Run 123 : Siemens star imaging in focal plane of the CRL4b.

                        To be noted: the FOV seems to be about 3 time the diameter of the Siemens star. However, defects of the CRL in the center of the FOV are problematic, and we need to outcenter the image to get a clean imaging.
                         Therefore, we have only a third of the FOV usable.

Run 124 : imaging of the pin

We move detector bench by 0.6m (toward IBS)

Run 125 : Pin imaging                                

We adjust CRL4b position with detm20 = 53.568 mm trying to optimize imaging of the siemens star.

Run 126 : Siemens star imaging
                           inner structure of the seimens star are more difficult to see. (air scattering?)

Run127 :  Imaging of the Pin with adjusted position found for the siemens star
Run128 :  Free beam imaging (in case we can remove the imperfections)

Quick and dirty normalisation of the Siemens start radiograph (run 127) using the reference from run 128 shows a well defined Siemens star down to 1um (cf. att-3).
Features from the inner ring can be observed. A more refined work on the data postprocessing would probably help to unveil part of those structures.
The overall transmission (modulated with the optics hutch attenuators) is about 1%

Clearly, downstream focusing of the X-rays give better imaging results (as expected due to lower Fresnel number) compared to upstream focusing which is heavily impacted by diffraction.

The bad halo in the center of the FOV was due to some defects on the edge of the beam / lenses.
By adjusting the power slits, we could somehow clean things. (cf. att-4)
The parameters of the power slits can be found in att-5.

17 Feb 2023, 20:46 Timing with the laser found.
17 Feb 2023, 20:46 : X-ray transmission set at 1.5% (optics hutch attenuators.)

Run 129 : Siemens star imaging with cleaned beam.
Run 130: Pin Imaging with clean X-rays
Run 131: Reference for the background

After same tricks as earlier, (normalizing siemens star by a background from free beam acquisition), we end up with a nice picture cf. att-6. We are happy!

17 Feb 2023, 21:30 : RAM ion detector for radioprotection has been placed on ladder close to IC1. Be careful around IC1, don't bump the ladder!!!
17 Feb 2023, 21:31 : Chains have been wrapped around IC1. Only people having the training for radiation protection from Erik can remove them.

17 Feb 2023, 21:32 : The macro for the energy calibration of RELAX can't be found

17 Feb 2023, 21:41  FSI shutter macro is configured for :
                                           - 180 mm is open
                                           -     0 mm is closed
                                           - By turning off the motors, you loose the micro steps, make sure the hole of the FSI shutter keeps centered with cold shot

ILM shutter for focus diagnostic is open at -60 mm and closed at 0 mm.
The shutter position needs to be checked roughly with MECHCAM-2 'FSE'

Reproducibility needs to be checked. Be aware if you drive the shutter in the limits and switch of the motor the shutter flies around ( no gear). 1mm = 1 deg

17 Feb 2023, 21:56 :
Run 132 : cold shot
 

A2 - G3

17 Feb 2023, 22:50 : X-rays seem not to be triggered!!! It is impossible to capture a driven shot!!!
                                 Opening and closing of ppu seems to be random!!!!
                            It seems that PPU needs to always be on a known state before shot procedure, else it doesn't work!!!!!
                             

The Zyla 5 camera (optic peter) has a high drop rate of frames (cf. att-7). This needs to be fixed so that we have a chance to get radiographs.
It also seems that image rotation of 0 degree is correlated to bad unreadable aquisitions.
It needs to be investigated.

Achievements:

1. Set up PP laser, find spatial and temporal overlap between FEL and PP laser
2. Optimize MCP and HAMP settings for good XAS signal
3. Find time zero from XAS on sample and optimize for XAS delay scans at 40 deg incidence angle
4. Take a fluence series on XAS delay scan from about 0.1 mJ/cm2 up to 2.5 mJ/cm2

Problems:
Nothing of note