# Morning Shift Summary 21.10.23

Ben, Eugenio

Achievements
* Found maximum of CDW with theta scan
* set up for time-resolved measurements

Problems
* FEL was down most of the shift due. Beam delivered around 12:30

Morning shift Summary 22.10.2023

Achievements

• Checked beam alignment and overlap

• confirmed sample integrity with static rixs on other sample locations
  Problems

• beam down after 11 am. No chance to resume till at least 18:00h

# Shift Summary

Achievements
 - Found RIXS signal from CuO as well as off-resonant elastic line signals from NiO and CoO
 - Found a potentially optimal exit arm setting and checked theta angle of sample
 - Determined energy calibration

Problems
 - Overall signal levels were quite low of CoO and NiO samples. This meant we had to work with open exit slits. Long scans would be required for optimization at HR conditions
- Interpolation procedure was giving lower signal as compared to direct integration. Algorithm needs to be checked. Analysis with no interpolation and curve correction is available in Software folder LLG/elastic_line_analysis.ipynb

Plan for next shift
- continue with optimization of hRIXS resolution

Achievements

• Measured self-refreenced XAS spectra with single color baem at the Mg K-edge

Problems

• Liquid jet required some mantanence during the shift
• Some newton detector images filled with NANs

Achievements

• Measured XAS and RIXS from NdNiO3 test sample at 230 K

Plan for next shift

• Measure test sample at 20K
• Find timing between X-ray and laser and look for transient signal

Achievements

• Moved spectrometer to 1000 ln/mm and began alignment

Plan for next shift

• Continue optimization of spectrometer with 1000 ln/mm grating

Problems

• At some point we lost signal from the spectrometer and it took some time to find it
• There were several beam lossed between 12 and 13h

Achievements

• Determined temporal overlap between the X-ray and laser
• measured Ti L-edge XAS and RIXS on samples for Asamara beamtime

Problems

• No problems

Plan for Next Shift

• Confirm spectrometer resolution at the O K-edge following spectrometer rotation
• Transfer user samples into XRD Chamber
• Check X-ray damage on user samples and begin user program

First four pictures: beam line status at beginning of shift - Beam aligned to MID

Idea is to check M2 parasitic motions again on M3 popin. therefore bringing M2 close to 0 with all vertical motors and Tx as much as possible without using beam on the popin.

Adjusting M1 pitch with it

Approch - drive roll and correct rz offest to stay in at the same horizontal position - adjust also ROLL Offset to show 0 in middle position

When ROLL IS DONE continuE with rx and then ty

offset calibration needs iteration. We started the second iteration but could not finish.

Other pictures: documentation of calibration process

This has several implications:

- ALL PREVIOUSLY SAVED RY POSITIONS ARE OBSOLETE!

- Ry values seem to have changed by a factor of 1000

- Accelleration and decelleration have been reduced significantly.

- MOTOR WILL STILL MOVE FOR SEVERAL SECONDS WHEN PRESSING 'STOP'

-Motor velocity has been reduced

Mirror pitch motors Ry were tested after scaling was changed to um.

Tx and Ry motor positions were calibrated to their measured physical positions.

ALL PREVIOUSLY SAVED SETTINGS FOR SASE2 MIRRORS ARE OBSOLETE!

New mirror positions for 9.3keV ; 2.2mrad ; B4C stripe are stored in MID-setpoints and HED setpoints

Please check the respective ELOG entries from July 20th

Position stored in XRO setpoints - F and HED setpoints - A

Second iteration and sanitty test for vertical mirror motion (Y) and vertical beam alignment (ROLL)

Vertical motors were calibrated and offsets saved in Euler MDL (no calibration of motors done so far - this should be performed during ramp up after WMP)

Calibration values are

Rz=-8.7805

Ty=-4.11

Rx=-4.53

PITCH=8.58

ROLL=4.2063

Residual horizontal parasitic motion is within 2urad for M3 - for vertical beam alignment, the residual horizontal parasitic motion is even less.

With Euler MDL, mirror can now be moved and the beam will mostly stay on the experiment screen.

Setpoints for HED set in XRO setpoints 'B' (8.8keV B4C)

euler MDL was calibrated for all three mirrors.

Optics setpoints saved in XRO setpoints for MID and HED

The Euler MDL was updated, so that velocities are restored to standard values also after the stop button was hit before motion was finished.

Please be aware that due to the synchronized motion, which is neccessary to keep the beam on the screen, some motors may move for a longer time with very slow speed (main reason - backlash compensation). We are working on a solution with a minimum speed.

!!! Euler calibration values are NOT connected to motor velocities and it is crucial for the functionality of the MDL that these stay as they are !!!

We found reflection of M3 on M2 popin, but could not locate the beam on HED PBLM nor HED_XTD6_SDLBM-1

scanning both horizontally and vertically around previously saved positions on M3 popin.

managed to get beam through to sdlbm-1. No beam found downstream of that.

Saved motor positions in last picture

ATTENTION: M3 MOTORS STILL NOT CALIBRATED AFTER MECHANICAL INTERVENTION DURING WMP. EULER MDL NOT WORKING RELIABLY FOR M3

It was possible to align to HED in parasitic mode to seeding tests

mirror horizontal position (coating stripes) was optimized as far as possible under parasitic conditions

vertical motors calibration and EulerMDL calibration still to be done - collimated beam needed for that.

Vertical motors of M3 now calibrated in first iteration and gemetrical neutral calibrated to 0 in motor settings!!!

New HED positions saved in XRO setpoints 'C'

euler calibration not completed for M3

On 27th of July, it was reported that arm 5 of the solid attenuator did not stay in 'out' position when retracted, but moved in immediately again.

Reason was, that the limit switch for the 'out'-position did not trigger, and thus the actuator was in error state. Default for error state is 'in'. In order to keep the arm removed, the default was changed on PLC level for the time being.

Today, 30th of July, we did ZZ to investigate the issue. It was found that the bar that accommodates the upper and lower limit switches had become loose and the limit switches were pressed out of the way by the motion, rather than being triggered.

The reason for the bar becoming loose, probably is a not ideal alignment of pneumatic actuator, guiding rod and limit switch bar, which resulted in a small relative motion between the three. This was fixed and limit switches were again aligned and trigger in both 'in' and 'out' position.

We believe, this will remain stable until WMP, but should be investigated more thoroughly, as we could not reach very well all connections in situ.

The door from MID side entrance was smashed and we lost the radiation permit.

The acciedent happened between 11 (when the door was lest use by MID members) and 14:19 (when the picture was taken).

It is possible that we will have the permit in the next hours to countinue.

The Door was repared by TS (thank you for the fast answer) and at 15:40 Eric gave us the right to proceed after the crosscheck of all the systems.

• stable SASE beam delivery with 1mJ pulse energy
• we took data for different optical laser excitation fluences and delays
• we changed from the optical lock to the electronic lock to measure also longer delays.