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

X-ray delivery

• 9.3 keV, 1-202 pulses at 1.13 MHz, 1.9-2.1 mJ.
• Overall stable delivery.
• L-IBFB could not be activated due to missing missing transfer matrix elements. Missing parameters entered by the expert who happened to be on shift this morning.

Optical laser delivery

• 800 nm, 50 fs, 564 kHz. Overlall stable delivery.

Achievements/Observations

• Installation and alignment of fixed target sample.
• Coarse timing of PP laser.
• Found diffraction of sample.

Issues

• Retracted CRL positions in MDL SA1_XTD2_CRL/MDL/CRL are not up-to-date and do not drive the CRLs to the "out" switch.
• PP laser OXC synchronisation signal dropped out a couple of times. LbSync and LAS informed.

achievements:

• hooked up sample cooling and reached 20K at sample at typical low consumption rate
• we archieved targeted resolving power of ~10,000 or 86meV @ 857eV at low temp 20K after indications that heating broadens the elastic line of CoO
• we observe sample damage at 30% and higher transmissions using 350pulses at 1.13MHz, while 20% or less seems fine and elastic line width and intensity remains stable
• we optimise focus condition == 10microns with focus downstream of sample position. KB VFM = 2.04  (beam size vs KB VFM was measured via knife edge scans) dE ~80-85meV
• transfer new sample holder with test sample

plan for tonight and tomorrow morning

• the exit arm may still improve the resolving power, less may be expected from the grating pitch. this can be explored but has lower priority as we reached slightly above E/dE = 10,000 already.
• take RIXS and XAS data on test sample, find optimum settings (damage threshold, camera readout etc) 
• late shift will start with 800nm timing.

problems:

• nothing to report

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

achievements:

• beam transport with the second half of undulators closed
• measured pulse energy in SCS hutch and verified that the transmission of the beamline with hr grating is as previously reported
• knife edge scans along vertical direction to find focus (<=11 um) and horizontal direction to have 175 um
• half clip scans to find center of rotation
• aligned Cu and Ni ML (theta offset) to find signal of Cu and Ni at hrixs
• delivered the beam at the hrixs ccd camera

problems:

• all the undulator cells were closed instead of only the second half of the undulators

plan:

• optimize energy resolution at hrixs at Ni L edge (priority)

Achivements:

-We measured vertical spot size for several VFM settings

Problems:

-We cannot focus the x-ray beam with KB. The best value what we can get is ~300 um. We checked the slits of KB. The ALAS is slightly clipped on parabolic mirror of tim ing chamber. TI is not clear if this is the reason. We cannot proceed with the program for hRIXS.

-Still no signal on APD.

9 and 10keV beam, up to 30 bunches, significant drop in intensity in the morning and in the evening.

Activities:

Commissioning of EH MIRR device

Preparation of user experiment at 10keV with lenses and monochromator

achievements:

• calibration of exit slits
• measurement of Cu L3 edge
• moved hRIXS to nominal settings for Cu L3 edge

problems:

• hRIXS motors could not be moved remotely, the problem was finally understood: GTZ had been moved manually into an interlock condition, going then to remote operation bring the motors to error state, it is then impossible to go out of error state from remote operation if there is also an interlocked state. In this case, the solution is to move the motor away from interlock state manually and then move to remote operation.
• vavle with filters in front of grating chamber cannot be moved: problem unsolved, please Martin have a look at it.
• DA online analysis tool for XAS was not working, DAC contacted Oleksey from DA and problem was fixed

plan:

• optimize beam dimension for hRIXS
• find rixs signal and optimize resolution

9.3 keV, 1-35pulses, stable delivery ~600uJ
*General alignment of MID branch to the DES
*Commissioning of CRL2 (MID_XTD6_CRL) together with EEE after change to close loop in the maintenance period and alignment of lenses, characterization of beamsize using the X-ray eye at the sample position.
*Alignment of spectrometer in DES

X-ray delivery

• 12.4 keV, up tp 352 pulses but the intensity drop across the train was too dramatic to use. reasonably stable delivery with 202 pulses.

Optical laser delivery

• none

Achievements/Observations

• reestablished direct beam trajectory and verified instrument alignment
• collected flat field calibration for AGIPD-1M for all high priority scenarios and some additional settings (see table copied in SPB commissioning or original AGIPD log)

The hutch search of SASE3, SXP became defective around 5am. 

DESY MPS group replaced a defective warning light unit and now it seems ok.

Good news: The 'jitter'-tests was sucessful and BKR could identify the jitter source related to a wrong software setting around the AH1 module of injector.

This was now fixed and the jitter has disappeared  . It is likely that the tuning was compromised by this setting from the beginning of this run (July11).

On Monday morning, a fresh tuning round will be started with hopefully improved SASE performance. Until then photon delivery with what we have.  

achievements:

1. found new M2 bender position for focusing using blank
2. tried to use unfocused beam for ESLITS calibration, but could not see it at SCSPopin, only at M5 Popin
3. we moved the XRD chamber laterally, closer to hRIXS, to be able to cut the beam using the sample at grazing incidence
4. seen FEL on antenna, measured FEL spectrum at navitar

problems:

• general slowness of SA3 motors whenever the whatchdogs were active, switching them off seems at least to mitigate (solve) the problem
• navitar camera in unknown state
• scs daq control in unknown state (problem caused by FADC not instantiated)
• SCS_XTD10_TPI/CAM/SHUTTER was in the UNKNOWN state: the camera cannot be pinged, probably it is disconnected. WE NEED TO FOLLOW UP WITH THIS
• HSLITS blades were in error and could not be moved, Leandro fixed this problem, the issue was at the PLC level and related to the encoder
• ESLITS imager and SCS POPin could not be moved, DOC (Dave) fixed this problem
• we could not propagate the unfocused beam to the SCS Popin, only up to M5 popin

plan:

• look for signal at the hRXIS
• optimize resolution by changing LEPM angle
• measure XAS using MCP
• look for signal at APD after moving the APD on the side of the sample that is not blocked by the L shaped knife edge

As discussed, there will be a beam interuption form 14:45 until probably 15:45 related to jitter studies at A1 that the BKR would like to try out. 

Harald

Achievements:

1. Beam in sample chamber, almost overlapping with ALAS

2. We saw signal on MCP and diode2

3. Sample Motors aligned close to the desired height in chamber

Problems:

1. Slow response of Screens and mirror motors, solved by restarting the Beckhoff of the mirror motors

2. Could not find signal of unfocused beam on SCS Pop-In

3. Acquiring data with the spectrometer for energy calibration does not work

4, Motor STZ of XRD does not allow halfclip of the beam.

5. No Fluorescence signal on the APD

6. In the DAQ we can not execute "assign" or "cofigure" action

After the 12 hour cryo failure last night, it was decided to exchange a faulty window with some reduced transmission at the injector laser today (see email by Andreas to xo-info yesterday). 

This was sucessful and the injector tunnel was closed today 16:40 and restart of the gun is ongoing. Tomorrow ramp up and SASE tuning.

The hope is that the large jitter and the poor SASE performance of last week can be now improved.  Beam delivery to instrument is expected on Thursday. 

Photon Activities by XPD colleagues in SA3 are concluded on Sunday 23.07 at 17:00. The photon commissioning activities are concluded for this week.

The PRC agrees with RCs to handle beam back to BKR for further tuning activities while touching common nobs.

Alignment to HED: https://in.xfel.eu/elog/XRO+Beam+Commissioning/205

SA2 - divergence with various M2 bender positions  HED - https://in.xfel.eu/elog/XRO+Beam+Commissioning/200

SA2 - divergence with various M2 bender positions MID - https://in.xfel.eu/elog/XRO+Beam+Commissioning/196

Issues with HED PBLM blade in SA2: https://in.xfel.eu/elog/XRO+Beam+Commissioning/195

Vobration measurements could not be done https://in.xfel.eu/elog/XRO+Beam+Commissioning/207

End of shift:

SA2 left with preAbs in

machine wanted to increase intensity

PBLM checked:  https://in.xfel.eu/elog/XRO+Beam+Commissioning/203

Solid attenuators checked: https://in.xfel.eu/elog/XRO+Beam+Commissioning/194

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