Beam aligned to SPB Pop-In https://in.xfel.eu/elog/XRO+Beam+Commissioning/185

Beam aligned to FXE Pop-In https://in.xfel.eu/elog/XRO+Beam+Commissioning/187

Vibration tests: https://in.xfel.eu/elog/XRO+Beam+Commissioning/188

Camera of M2 may not be working. Please check.

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

Summary of today's activity:

• Beam handover ~ 3pm.
• SA2 mirror set tp B4C.
• SA2 Rough alignment to MID & HED @ ~ 2-2.5 mrad ==> img 1, 4, 5 & 6
• SA2 HED-Preabsorber position check with x-ray (working) ==> img 2 &3
• SA3 M6 mirror Switch check (seems to be working)
• SA1 rough alignment to SPB (M1,M2) at 2 mrad ==>img 7&8

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

YAG screen
The damaged screen "YAG2" with Al coating had marks and had been exchanged.
The Imager Watchdog now protects the screen - operational for some months i.e. the number of bunches is shut down to zero if the intensity at the screen is too high. In this case, best then is to use the GATT.
Follow the instructions and informations given in the Imager scene.

BN screen
Also the "BN" screen had slight marks and had been exchanged. This screen suffered from accumulated dose over the years but no special protection is foreseen. The imager Watchdog will warn. BN has a high damage threshold for single pulse damage similar to diamond. In contrast to diamond it will not show spurious reflections, like optical light in the beamline or background from SA1 pulses but it has a lower spatial resolution.
Follow the instructions and informations given in the Imager scene.

Rampdown day activities

The main focus is as usual on checking all tunnel components and to identify any potential
issues that could be fixed during the maintenance period which will be starting this wednesday.
Outline time schedule as sent around last week by Maurizio:

• 7:30-11:00: SASE3
• 11:00- end: SASE2
• 13:00-end: SASE1

During the today x-ray rampdown activities, XPD will work mainly from BKR (Jan, Naresh) and SCS hutch (Theo, Joakim).
Communication via zoom-room REMOTE1 or mobile phones.
Naresh is initially supporting Weilun / Gianluca for their study (SA1 and SA2) and will check both HIREXs.
Joakim will work in SA3 on PES + grating spectrometer with support by SCS or SQS colleagues, probably when XRO is finished with SA3 (after 11:00)
Jan will focus on the MCP detectors and imager in all SASE beamlines, in coordination with the XRO activities.

• concluded user experiment on dynamically compressed water
• long train operation worked relatively stable with no major interuptions in beam delivery

posting for 17th June

Staff: AR, AS, FK, HH, JB, KK, DZ, MK

X-ray delivery

• 12.4 keV, 1.4 mJ

Optical laser delivery

• 532 nm, ns-laser for sample pumping

Achievements/Observations

• Continued to collect data many hours of data collection

Issues

• coupling with SASE2 limited feedbacks to control slope across train, this led to dificulties in alignment and lost time to correct for poor visualisation of the beam.
• After discussion SASE2 kindly gave permission to BKR to corect the slope to facilitate our alignment
  • we also with the help of PRC arranged for the same arrangment for alignment for sunday

- Pulse intensity decreases drastically at XTD2 across the train

- the visualisation of our beam therfore needs to be compensated adjusting transmission

- beam shape and uniformity is different than previous days and it is unclear how much of this is related to real changes in the beam or an effect of the slope in the train. We are therefore spending more time than usual to investigate and align becuse we cannot correct the slope.

>50 pulses was requested for alignment explicitly as this is needed to setup the instrument for measurment.

Beam 18 keV, 0.5 MHz, long trains up to ~280 pulses

• change setup to dynamic DAC
• prep for user beamtime: alignment of X-rays, focusing (~40 um), train-on-demand for long trains, transmission runs
• darks, XRD calibrations for AGIPD

Issues:

• AGIPD may need a timing scan
• trains decreasing in intensity rapidly

Beam is back at around 11:30 pm

We lost 1 hr 30 min of beam time.(it was promised to get back at around 10:00 am)

If we want to change the pulse number then we need to call BKR.

staus of JUN16, 11:30

SA1 and SA3 have been adjusted to acceptable conditions to be compatible with simultaneus operation at SA2

tuning on SA2 is ongoing

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status of JUN16, 8:40

Update: problem is solved. Rack fuse in electrontunnel was blown. Operators are bringing the machine back up at the moment.

Afterwards (around 9pm) photons are all needed at SASE2 for tuning to full train mode.

Photons will be given back to SA1 and SA3 as soon as possible. Please encounter good beam conditions for measurements not before 10 am.

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Dear all,

please note that we have a downtime since 4am which is expected to last until 8am or longer. There are issues with the following components: magnets, BLMs, the XS1 dump-PLC etc.

The source is yet unknown and will be investigated in an access to XS1.

I will keep you informed in this channel.

Regards

Michaela

X-ray delivery

• 12.42 keV, stable delivery in single pulse mode with 1.9 mJ/pulse

Optical laser delivery

• 532 nm ns-laser for sample pumping

Achievements/Observations

• Collected protein crystal diffraction for three different samples with varying laser delay and fluence. LCP viscous jet sample delivery.
• Stable CRL focus using tunnel collimation with 3 XTD2 lenses followed by 17 focusing lenses in SPB hutch. 2 um FWHM focus with <1um standard deviation in 'X' position.
  • 3 XTD2 lenses gives a round X-ray beam approx 1 mm in size, such that we are almost overfilling the CRL apertues in SPB.

Issues

• Some initial jetting issues, which have now been solved.

18 keV, 150 uJ per pulse, 2.2 MHz

• continuing user program proposal 3285
• X-ray heating and laser heating samples in DACs
• using only the first 200 pulses of the train as the intensity after decreases fast, conversion of the samples is difficult due to low pulse energies

beam: 18 keV, 352 pulses, ~200 uJ per pulse

achievements:

• AGIPD timing scans, AGIPD darks.
• beam alignment, CRL3 focusing, prep for the user beamtime

beam conditions:

• beam is jittering in position and pulse energies are on the lower end. The pulse train in decreasing in intensity

Dear all,

the closing report on this issue can be found in the following Alfresco link:

https://docs.xfel.eu/share/s/GzxORQOGToe_tiug7LIHhQ 

Regards,

R.

BKR changed the beam energy from 15 keV to 12.4 keV

Energy 12.4 keV

Repeatation rate 1.1 MHz

Average pulse energy 1.8 mJ

X-ray delivery

• 12.42 keV, stable delivery with slightly less than 1.0 mJ/pulse (~0.95 mJ/pulse)

Optical laser delivery

• none

Achievements/Observations

• BKR semi-optimized photon flux by ~20% more then yesterday)
• Long data collection (5 hours) although we still had rather low hit rate with ligand (hit rate was higher without ligand)

Issues

• Beam pointing issue (only relavent to SPB_EHC_CRL) after BKR semi-optimize photon flux
• Rather low hit rate due to flux, crystal size, ligand, etc.