X-ray delivery

• 12.8 keV, 1 pulse, ~0.7 mJ

Achievements/Observations

• Except for some downtime due to beam down, majority of the time was for data collection
• 6 windows of a chip collected, with variations in shots spacing (30 um and 60 um) and rotation

Issues

• Something is still causing beam drift constantly, even though we can correct it with the feedback.

We observe a continuous horizontal beam drift in SA1 after the M1 incident. It seems not to converge, so one can wonder where this will go....

Attached screenshot shows the M2 piezo actuator RY that keeps the beam at the same position on the M3 PBLM. These are about 130 m apart, The drift is 1V/12 hours. 0.01V corresponds to a beam motion by 35 um. So the drift velocity is 0.3 mm/hour. In the past days this had at least once lead to strong leakage around M2. But the two feedbacks in the FXE path are keeping the beam usable most of the time.

X-ray delivery

12.8 keV, ~0.8 mJ

Achievements/Observations

- Data collection with fixed target

Issues

- M1 and M2 position on SPB/SFX Setpoint J was far from optimal
- Beam position in X was drifting to minus direction all time 

What has happened:
During euler motion calibration of M1, we were driving the vertical motors by a few mm back and forth. At some point, the Rz motor went into error, as we attempted to go further in negative direction. Resetting the axis several times did not solve the problem. The vertical motors were then moved to 0 position. DOC was called and helped to overwrite some parameters that triggered the error.
When resuming the calibration routine, the beam suddenly got lost and the vacuum interlock triggered V0 to close. Vacuum in M1 recovered quickly, but on M2 popIn, only the direct beam could be seen. At this point, the conclusion was that one of the motor connections must have come loose, which caused the vacuum event and removed M1 from the beam.

It was then decided, that we break the interlock, vent the chamber and re-connect the motor if possible.

The situation we found was the following:
-Rz connection lead-screw to bellow was detached
-mirror sitting on the mirror holder
-significant InGa spillage on chamber bottom, window flanges opposite to the mirror AND a lot of drops on the mirror surface

Pictures are attached.

Intervention:
The lead-screw and nut were exchanged. There was significant wear on the bearing plate, connecting the lead-screw to the bellow.
When trying to install the new lead-screw with a spare bearing plate, it was found that apparently the thread on the bellow side was deformed as well, and the spare part did not fit to the thread. Since the old bearing plate was the only possible way to connect the lead-screw to the bellow, it was cleaned, lubricated and re-used. The position was manually adjusted around 0 position (66,7mm protrusion) and the motor connected.

Recommendations:
- since the damaged bearing plate was re-installed, it should be avoided to move Rz. The motor should be permanently interlocked and only operated with absolute care for initial alignment.
- the mirror surface is severely contaminated with InGa, it must be checked if a position with acceptable beam can be found (only to be done by XRO as this needs Rz to be moved)
- the affected bellow has to be exchanged to facilitate replacement of the damaged bearing plate. As this requires the mirror chamber to be opened, this only makes sense in connection with replacement of the mirror + cleaning of the chamber.

X-ray delivery

• 12.78 keV, ~1.3 mJ

Optical laser delivery

• 800 nm laser for jet visualization

Achievements/Observations

• Collected SFX data
• Calibration date for HIREX measured (at different X-ray energy)

X-ray delivery

-12.40 - 12.82 keV, ~1.3 mJ

Optical laser delivery

-800 nm laser for jet visualization
-525 nm ns laser for pumping

Achievements/Observations

-Focus IRD
-Collected SFX data

Issues

-SPB_EHC_VAC/DCTRL/GAUGE_FR_1_Value triggered interlock, we could not open gate valve : SPB_IRU_VAC/VALVE/VALVE_INLINE_3

X-ray delivery

-12.40 - 12.82 keV, XDT9 XGM ~0.85 mJ, 3 hours interruption by vacuum issue on XTD9

Optical laser delivery

-800 nm laser for jet visualization
-487 nm ns laser for pumping

Achievements/Observations

-Focus IRD
-Collected SFX data
 

Issues

-AGIPD chiller was down
-Issue with tunnel vacuum valves, at around 7 pm, ended shift early

X-ray delivery

-12.40 - 12.82 keV, XDT9 XGM ~0.81 mJ@ end of shift

Optical laser delivery

-800 nm laser for jet visualization
-487 nm ns laser for pumping

Achievements/Observations

-Focus IRD
-Collected 10 ns SFX data

Issues

-AGIPD chiller was down

Used 9.4 keV with 94 kHz wed and thu nights. Received approx. 0.9 mJ with large fluctuations in pulse energy, however acceptable for the tasks below.

Achievements:

• X-ray optics and goniometer aligned for next user experiment 5725
• Transmission through Mono #2 recovered and calibrated to match Mono #1
• Understood uneven beam profile of FXE PI originating from the thick XTD2 ATT CVDs. Without them, the beam looks nice.
• Observed that overbending M2 gives better beam profile than underbending under the present conditions

Issues encountered:

• Major issue: M3 RY piezo actuator not working any more. This means beam feedback cannot run and beam keeps drifting off on the instrument apertures. This cannot be compensated by M2 piezo due to the small aperture of M3. The issue was reported wednesday night to PRC, XRO and FXE group and is being worked on by XRO
• One limit switch was found swapped; fixed by FXE engineers
• Some motors moved in the opposite direction as compared to previous commissioning, even though parameters were saved and restored. Not understood, but was easy to work around.

X-ray delivery

12.40 - 12.82 keV, ~1.1 mJ

Optical laser delivery

ns laser for jet visualization
ns laser for pumping ready but not used

Achievements/Observations

• Focus IRD
• ns time and spatial overlap
• Collected lyzo data
• Collected dark rhodopsin data
• New opaque foil installed on cube X-ray exit side

Issues

• Roadrunner motor issues solved after manual intervention and computer restart

X-ray delivery

12.40 - 12.82 keV, ~1.1 mJ

Optical laser delivery

800 ns laser for jet visualization

Achievements/Observations

• 800 ns laser for jet visualization (aligned but not timed)
• Jungfrau timing done
• IRDa focus done
• IRDa fully aligned
• Sample delivery ready
• Powder data collected

Found the interference fringe at Suna microscope with Zyla cam from MID split-and-delay line. 
The fringe patterns were recorded as a function of delay controlled by the upper branch motor position. 
Obtained the interference fringe patterns with two pulses with different repetition rate of machine. 
BKR provided the two color HXRSS seperated by a few eV, and SDL was aligned accordingly. 
The fringe patterns were recorded as a function of delay with two X-ray photon energies.

Found spatial overlap at Suna microscope with Zyla cam.
The splitting ratio was obtained about 1:1. 
The spatial jittering from upper and lower branch were investigated.
The temporal overlap and fringe will be investigated further.
 
 

X-ray delivery

11.56 keV 202 pulses @0.5 MHz, ~1.0 mJ

some downtime due to fire alarm in the tunnel

Optical laser delivery

800 ns laser for jet visualization

PPLaser for time-resolved data collection

Achievements/Observations

• PPLaser timing and alingment done
• Collected several hours of PYP sample with 30ps laser delay

Issues

• DAMNIT issue solved with OCD DA
• some online calibration issues from before persisted

Summary 06.08 - 10.08

X-ray delivery

• 9.3 keV, 1-352 pulses @ 1.13 MHz and 564 kHz, 1.4-1.8 mJ
• 11.56 keV 1-352 pulses @ 1.13 MHz and 564 kHz, 0.7-1.0 mJ.
• Large impact on SASE1 when SASE3 used pulse on demand at the start of the week. Ok since we were setting up, but would be problematic during measurement.
• Overall stable delivery except for the point above.
• Notable downtimes:
  • Thursday afternoon 08.08, beam down during ~1 hour for a ZZ in XTD9 to fix the monochromator motion.
  • Thursday evening 08.08, beam down during the last 45 minutes of the shift following wavelength change request of SASE3.
  • Friday afternoon 09.08, beam down for ~2 hours due to ZZ to fix communication with a device.
  • Saturday morning 10.08, beam down during 45 minutes due to problems with A5.

Optical laser delivery

• 800 nm, 50 fs, 1-202 pulses @ 564 kHz and 141 kHz.
• Laser delivered from Thursday afternoon, as agreed with LAS. One of the issues addressed, but performances still sub-par and more work is required.

Achievements/Observations

• Collected data for all but one PCS proposals. Sample for last PCS is expected to be delivered to EuXFEL on Monday.
• Setup of HIREX for 9.3 and 11.56 keV.
• Completed laser setup for IHR.
• Established laser/X-ray timing.

Issues

• Multiple issues with the online calibration pipeline. It is regrettable that a new version including breaking/major behaviour changes has been deployed after the bring up days, where everything had been succesfuly tested.
  • Constants failing to load after changing detector configuration in the calibration manager. Hotfixed by CAL OCD.
  • AGIPD double pixels mask not correctly applied. Hotfixed by CAL.
  • Changing number of memory cells in the calibration manager, but without loading new constants, changes drastically what is displayed in the AGIPD corrected preview. DOC informed, fix pending.
  • Independent settings for the different pipeline preview data have been implemented, but not communicated. This is very dangerous for the detectors. We have implemented a workaround to restore the previous behaviour.
  • Difficulties in reliably getting a preview of all AGIPD modules even with settings we used with the previous version of the calibration pipeline.
  • HIREX correctino devices had been renamed in the SASE1 topic, but no information was provided to instruments resulting in missing clone devices in instrument topics.
• Offline calibration throws error for most runs because there are sequence files that contain no valid trains produced at the end of the runs. This is not really a problem and would require a less ambiguous statement in myMdC as this makes it difficult to spot when an actual error occurs. DOC/CAL informed.
• DAMNIT could not be started on non-display Maxwell nodes. It turns out an additional argument is required following the OS update during the summer maintenance period, but this is not documented. The solution was provided by DA OCD.
• Ice detector generating many false positive and sending of report not working. To be addressed with DA on Monday.
• Graphical bug in Karabo Image Graph widget when the same data are displayed in two scenes. More detail will be provided to CTRLS.
• XTD9 PBLM at the nominal 'out' position was not fully out and the beam could still be seen on it.
• HIREX interlocks not working as expected and preventing the use of more than two pulses when HIREX is supposedly extracted from the beam path. Mitigated by the PRC.

Found the spatial overlap on the Suna microscope with Zyla.
Found the SDL motor position giving 200 fs time difference between the upper and lower branches. 
The encoder and current values of DC2_CASZ and DC1_CASZ are not 100 % correlated. 
The SDL delay scan using ScanTool has an issue due to the incorrect motor movement. 
The manual delay scan has been attempted, which was not successful. 
 

EPS Interlock change for Mode30:
the 3 HIREX Interlock conditions had been disabled

The SASE1 HIREX interlock is not working as expected.

At the position 'OUT' (step 2 in HIREX scene) and while none of the motors are moving, the interlock SA1_XTD9_HIREX/VDCTRL/HIREX_MOVING is triggered, which prevents the use of more than two pulses.

SA1_XTD9_HIREX/VDCTRL/HIREX_MOVING remains in INTERLOCKED state while moving HIREX in (expected behaviour) and finally goes to ON state when HIREX is inserted, thus releasing the MODES and MODEM interlocks and allowing normal beam operation.

Found the delay time from upper and lower branches of SDL with a frosted-YAG.
The upper branch is -512.8 and the lower branch is -513.28.
The delay time difference is about 500 fs. 
The Mid SDL delay tuner should be investigated further more. 
The next step is find the spatial overlap on the Suna microscope and measure the fringes.