SPB/SFX In-house research 4978 shift 3 - end

X-ray delivery

• 9.3 keV 352 pulses / train, relatively stable intensity ~1.9 mJ / pulse
• beam down ~30 min

Optical laser delivery

• None

Achievements/Observations

• Collected several runs for the in-line crystallisation project but some difficulties to inject, probably a coating issue
• Saw a lot of crystals

Issues

• Realised that there seems to be a vacuum leak from the load lock valve. Optimal pressure is only achieved when the load lock pump is running.

changing SA3 mono from grating to blank while having the und to mono synchronization running apparently caused the und photon energy to change to 680eV. the synchronization MDL went into pink-disable when changing mirror settings, so this change in photon energy should not have occurred.

After going back to 940eV, the SASE level did not come back. BKR tried to tackle this for some while until they asked for intervention of the MRC.

SPB/SFX In-house research 4978 shift 2

X-ray delivery

• 9.3 keV 202 pulses / train, relatively stable intensity 2.0 mJ / pulse at start of train, ~30% decrease in intensity across train
• BKR made an attempt to inprove slope around 18:00, small improvement but degraded again over time
• One short interruption

Optical laser delivery

• PP laser 1030nm 3rd harmonic (343nm) @ 282 kHz, 101 pulses / train

Achievements/Observations

• PP laser timing for 10nm time point
• PP laser / x-ray overlap with buffer + caged compound
• de-oxy Myoglobin + caged compound data with and without PP laser activation of caged compound

Issues

• several nozzle changes requried throughout the day
• significant sample debris on windows from nozzle 'events' requried mid-run shroud and window clean

Instrument status

• AGIPD HV off
• Shutters closed
• in-line vacuum valves closed.

To do for next shift

• shroud / catcher clean needed
• alignment etc.
• in-line crystallisation project

SPB/SFX In-house research 4978 

X-ray delivery

• 9.3 keV 202 pulses / train, relatively stable intensity 1.9 mJ / pulse, some decrease in intensity across train

Optical laser delivery

• PP laser 1030nm 3rd harmonic (343nm) @ 282 kHz, 101 pulses / train

Achievements/Observations

• PP laser timing for 100nm time point
• PP laser / x-ray overlap with buffer + caged compound
• de-oxy Myoglobin + caged compound data with and without PP laser activation of caged compund

Issues

• suspicion of leaking plunger in the last reservoir of the evening

Instrument status

• Shutters closed
• XTD9 atteunators @ thick CVD diamonds

FXE (Fred) confirmed that they don't use beam for night shifts from Friday to Sunday.

- Received a call from machine RC (Sergey Tomin)

- There is an issue with DOOCS to Karabo bridge, Tim and DESY experts are looking into this and came to the conclusion that it can't be resolved now and need more time something like 1 week. (probably next week). Due to this PySpectrometer for SA3 is not available, as SQS would like to set up a spectrometer to measure pulse duration. However, it can work in Karabo and take data.

Issue with SA1_XTD9_PBLM and it is stuck.

Hi All,

After discussion with SPB, they will slightly move the PBLM screen where they don't see any distortion in the beam and are willing to continue to work till Monday. 

The conclusion from EEE (Leandro) and DOC is that from PLC everything looks fine and it might be with mechanics for this we need to physically look at the device. 

As SPB can work like this till Monday. I proposed on Tuesday with someone who has knowledge of PBLM device can organize the ZZ

Next week Jan is PRC

Dear FXE colleagues,

There is an issue with SA1_XTD9_PBLM and it is stuck. Please when you use the beam in the night, coordinate with SPB first. or call PRC no. 9-4800

SPB/SFX PCS user proposals (day 1)

X-ray delivery

• 9.3 keV, 1600 uJ/ pulse

Achievements/Observations

• PCS user time (day 1) completed. Several runs from different user groups with visible diffraction patterns, likely not sufficient for full datasets
• Additonal data for nozzle alignment sub-project (Lysozyme)

Issues

• ONDA setup a little fiddly (default data stream name not correct?)

Instrument status

• AGIPD HV off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.
• Vacuum valves closed.
• Sample chamber turbos off
• Laser lamp off

To do for next shift

• clean catcher (watch out for guidance on user sample handling)
• align laser for in-house work
• remaining PCS project if viable

Morning shift:

- Tried to align the fiducial fiber in IC1 for the streak cameras, however it was unsuccessful.

- The karabo device for the SOP had to be restarted. Crosschecked that all the timings were still correct.

- Took some CeO2 diffraction images on the VAREX detectors and found several problems:

1. the VAREX detectors are storing the data under different trainIds. Taking as reference the pulse-picker unit, VAREX1 stores data in trainId+2 and VAREX2 in trainId+15.
2. the frames appear to be "hard cut". The diffraction signal gets cut as if the readout was interrupted and the rest of the frame is filled with background.

- DiPOLE works ongoing, focus optimization.

Late shift:

- DiPOLE timing achieved

- Spatial and temporal calibration of SOP and Visar.

- First DiPOLE shots, however no signal seen in Varex, some fringe shift observed in visar.

Night shift:

- Further few shots to debug the issues.

- Users wanted to optimize imaging of the VISAR, achieved optimization in Arm 3

- Debugging of Varex trainId and frame cropping issues. Should be followed up with controls.

- Achieved signal in the fiducial fiber from IC1.

SPB/SFX User Proposal 3333 Shift 2 Summary

X-ray delivery

• 9.3 keV, 1.7 mJ, 202 pulses @ 564 kHz

• 2 pulse trial @ 2.8 kHz (2.2MHz / 800). Doubled data rate for high viscocity jet. Seemed to work quite well although not expected to be a regular use mode!

Optical laser delivery

• Only 819 nm ns laser for the jet visualization

Achievements/Observations

• Data calibration issues solved (thanks to DRC / ITDM experts)

• Silicon wafer post sample attenuator was dismounted. elog: 45

• High viscosity jet delivery @ 10 Hz and 2.8 kHz (2 pulses / train @ max spacing)

• Photosystem-II (@ 41 mm AGIPD Z motor value, adaptive gain) elog: 85,86, various sample preparations

Issues

• ONDA restarts required

Instrument status

• Sample chamber and AGIPD turbos OFF, rough pumping ON

• shutters etc. closed

To do for next shift

• Catcher and shroud (inc windows) could do with a clean before any alignment (PEG delivery)

• Proceed with PCS users

Morning shift:

- First thing in the morning ~7 am, the MDL in the SASE 2 topic were down. Even the watchdog which prevented us from moving SA2 attenuators. DOC quickly resolved the issue (10 min).

- Beam alignment down to the IBS. X-ray mirrors at 2 mrad. Approximately 85% transmission through the beamline.

- Transmission DAQ runs for cross calibration of devices.

- Focus at TCC in IC2 with CRL1 arms 6 and 8 and CRL3 arms 5 and 9. Focus of around 10 um.

- At around 14:00 the problem with the MDL in SASE2 topic happened again. Was again resolved by DOC.

Late shift:

- Timing setup for SOP and Visar systems, found timing on both systems.

Night shift:

- Improving the imaging quality of SOP and Visar. Did not manage entirely.

- DiPOLE timing setup.

SPB/SFX User shift 1 3333

X-ray delivery

• 9.3 keV, 1.7 mJ, 202 pulses @ 564 kHz

Achievements/Observations

• Silicon wafer post sample attenuator (240um, ~10% transmssion @ 9.3 keV) was mounted in-front of the AGIPD detector. elog: 3

• Beamline is aligned for the NKB trajectory and the x-ray focus size of 300 nm being achieved. elog: 4

• Copper flat field including 240 um silicon wafer attenuator. elog : 7

• Lysozyme and Photosystem-II data (@ 41 mm AGIPD Z motor value) elog: 5

• Fixed medium gain used initially, later switched to adaptive gain to allow high gain for peaks behind Si attenuator mask. Switch of both calibration pipelines..

• data at full transmission. Move to medium gain for water ring outside Si attenuator

• Several blocked nozzles, at least potentially caused by never filtered sample.

Issues

• Problems with post calibration analysis, observing 'disk quota error' - SPB/SFX RC to investigate with instrument data team and DRC

• problems with data calibration - SPB/SFX RC to investigate with instrument data team and DRC

Instrument status

• AGIPD off and warm

• AGIPD gate valve OPEN and pinned.

• Attenuators set to thickest diamond.

• Vacuum valves closed.

• He valve closed.

• Sample valves cleaned.

• ns laser off.

• Sample chamber and AGIPD turbos OFF, rough pumping ON

To do for next shift

• remove Si post-sample attenuator

• continue with user program (small crystals DFFN etc. see elog)

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

• Beam came back quickly after cryo-incident with ok seeding performance (not very stable).
• Finish 3381-Pudell beamtime with SRO/STO samples at time delays and laser fluences.
• Decided not to scan the HXRSS energy but stay at current position
• Mount samples for 3331-Robinson experiment and search for Bragg reflections, we could find the specular reflection for the two largest samples but not the magnetostrictive one.
• The specular reflection for the 8x8um sample is currently aligned.

Problems:

• AGIPD darks could not be pushed into the calibration pipeline, the problem was fixed quickly by DOC and OCD

Achievements

• Beam transport
• Coarse and fine timing
• XAS on Co
• Aligned HSLIT, pinhole, camera beamstop
• Characterize FEL beam size and position on curved grating
• PPL Power measurement
• Fluence scan on sample of optical laser and FEL to determine good conditions
• Prepared for night shift time-resolved measurements

Problems

• No major issue

Achievements

• Work on laser to improve the beam profile and reduce pointing. Apertured the beam upstream of focusing lens and changed to f=750 mm. Significant improvement.
• Characterized beam size, found positions of photodiode, antenna
• Check coarse timing with reference
• Aligned FEL beam to sample

Problems

• Problems with smaract stages
  • Fixed with the help of DOC (Loic) by power cycling controller after long debugging.
• Beam down just before attempting coarse timing.

Quick aligment of the instrument with quiet good HXRSS performance after cryofailure

Checking of t0 to the optical PP laser

Test of energy scanning macro (Undulator + HXRSS)

Cool down of sample and measurement of first delay points until cryo failure 2

Beam loss due to cryo plant failure

X-ray delivery

• 12.0 keV, 1.3 mJ, 1-168 pulses @ 564 kHz
• Cryo issue at 3:33

Optical laser delivery

• 1030 nm compressed, THG.
• Stable delivery.

Achievements/Observations

• Collected TR-SFX data. Smooth sample jetting.

Issues

• Beam down, shift ended earlier.

Activities:

• Investigated SAXS scattering instability and found it to come from the pointing variation of the PPL
• Recorded microscope images of the PPL spot of the pBN to quantify the pointing for different spot sizes
• Enlarged the beam and measured pumped SAXS. Results seem better than before.

Problems:

• PPL pointing is not stable enough for consistent pumping effect in the probed area.
• Sample scanner x motor went into error due to interaction with the magnet and had to be coaxed back into operation.
• FEL down with cryo problem.