X-ray delivery

• 9.3 keV, up to 185 pulses at 564 kHz, 2.3  mJ, stable delivery

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 62 pulses @ 188 kHz

Achievements/Observations

• Alinment for TR-SFX and data collection

Issues

• Karabo did not work sometime, lost more than 1 hours

Shift summary for 28th of Aug.
- Realigned the center of rotation. 
- MID took the seeded beam at about 120 uJ around 4 p.m. after the long intervention.
- Cross-checked the time zero with Bi 222 diffraction peak.
- Searching and collecting diffraction patterns from a single nanocrystal. 
The user will continue to find the optimized condition for the flux of X-ray and Laser. 

X-ray delivery

• 9.3 keV, up to 185 pulses at 564 kHz, 2.4  mJ, stable delivery

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 62 pulses @ 188 kHz

Achievements/Observations

• Alinment for TR-SFX and data collection

Issues

• Nozzles were clogged a lot, crystals were formed on catcher cone.

Dear All,

Two important machine updates.

1) Still, the forecasted time for the start-up of the machine will be tomorrow morning.

2) After discussion with machine RC, it is confirmed that beam delivery is extended by 24 hr, so the beam is available till 7 am Tuesday morning for instruments.

Just want to point out, that this is a very exceptional case that it is extended by 24 hours as there will be a blue week(in wk 35).

The below programs have been canceled keeping in view of the user program and beam delivery is important for instruments. Sorry for this.

153339 - Euler MDL calibration for SASE2 mirrors M1, M2, M3: Antje 

158376 - Beamtime for Safety tests (HED Preabsorber): Eric

156699 - SASE3_XTD10 Virtual Spectrometer: Joakim

157789 - Chirp-dispersion short pulses study (further decoupling from SASE1): Svitozar

Stay tuned to the public display tomorrow morning for the machine's status.

thanks

Naresh

PRC wk 34

- Machine updates;

Saturday 1:30 hr Cold compressor failed. The initial estimation of downtime was 20 hr, later in today morning crew gave a new estimation of time of 30 hr. So the machine will be switched on and beam delivery to instruments will be tomorrow morning. Today at 3 pm, I will get more information and a clear picture of the best estimation time for beam delivery.

Naresh

X-ray delivery

• 9.3 keV, up to 185 pulses at 564 kHz, 2.7  mJ, stable delivery

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 62 pulses @ 188 kHz

Achievements/Observations

• Alinment for TR-SFX and data collection

Issues

• AGIPD vacuum gauge was in error, unplug and plug in fixed this error

problems with machine operation

very low yield at 1.8keV, took ~2hrs tuning time to get 600uJ (linear taper)

SA3 cells opened without us knowing when hv was changed

observed strong pointing change (and beam profile shape) when changing

- SASE3 pulse timing

- photon energy

pointing change with changing photon energy was such that the beam would make it through the GATT only partially (att. 1). this is unprecedented.

X-ray delivery

• 9.3 keV, up to 185 pulses at 564 kHz, 3.7  mJ, stable delivery

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 90 pulses @ 282 kHz

Achievements/Observations

• Alinment for TR-SFX
• Data collection in dark state and excited state at 203.5 ns

Issues

• MDL devices and macros on macrosever2 were dead around 19:30, took more than 2 hours for recovery. 
• Dark calibration issue

X-ray delivery

• 9.3 keV, up to 185 pulses at 564 kHz, 3.7  mJ, beam intensity drop, missing last 10-20 pulses in train sometime

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 90 pulses @ 282 kHz

Achievements/Observations

• Alinment for TR-SFX and PAM
• Data collection for IHR

Issues

• Beam intensity was not that stable
• Strange scattering from amorphous sample and powder diffraction were appeared during data collection

X-ray delivery

• 9.3 keV, up to 178 pulses at 564 kHz, 3.7  mJ, stable delivery
• Beam delivery was started from 19:00

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 90 pulses @ 282 kHz

Achievements/Observations

• Alignment was completed within 3 hours including T0
• Some data collection with fixed target

Issues

• XTD9 safety shutter was closed

Photon beam delivery status:

- Machine informed that beam will be handover to instruments SA1 (SPB/SFX) and SA3 (SXP) at 18.30hr

- Machine needs more time for SA2 and the next update will be at 20hr.

This message has been communicated to instruments.

SA1 photon beam line status

- CRL1 lenses are in the beam. 

- The shutter between XTD2 and XTD9 is closed (The reason is not known)

I will retract the CRL1 lenses. Asked the machine to open the XTD2 and XTD9 shutter.

SA1 photon beam line status

- CRL1 lenses are in the beam. 

- The shutter between XTD2 and XTD9 is closed (The reason is not known)

I will retract the CRL1 lenses. Asked the machine to open the XTD2 and XTD9 shutter.

beam: 7.7 keV seeded, ~300 uJ/pulse, 2.2 MHz, 20 pulses

• user experiment finilized, IXS scans on Si, Al and Cu at different momentum transfer angles
• measurements of plasmons in cold material only
• pulse energy increased slightly, however it is mostly in the SASE pedestal which is insufficient to caramelize the electrons into a souffle

beam parameters: 7.7 keV seeded, 2.2 MHz, up to 20 pulses, 150 uJ/pulse

• user program, measuring IXS spectra of plasmons with high resolution using seeded beam and monochromators
• mono (re-)alignment to minimize the SASE pedestal of the seed. Need to search for good position of the beam on the crystals as with just a slight change in pointing, the transmission goes down and deteriorates the beam spot
• haveing troubles getting good transmission through the mono
• taking spectra with the monochromatized seeded beam on PMMA, SiO2 and Al to be compared with the non-monochromatized cold spectra with 20 bunches.
• second half of the train is often not lasing though transmission of the pulses through the warm mono seems ok

Achievements:
1. Finalized tr-RIXS series at 1.74 mJ/cm2
2. Checked FEL alignment
3. Started fluence series for tr-RIXS on peak C, completed: 1, 1.5 and 2 mJ/cm2

Problems:
1. We noticed that calculator for PP laser fluence was not giving a correct value. The formula was corrected and the older logbook entries need to be checked. We start to use the "new values" from now on.
2. XAS processor get stuck and was restarted
3. left PC (pcx30525) got stuck and had to be restarted
4. hRIXS camera scene got stuck, so that it would not operate the PP laser delay stage. Help from DOC.
--> Solution: shutdown and reinstatiate device: SCS_HRIXS_DET/MDL/CAMERA_SHUTTER

Shift Plan:
Continue fluence series for: 0.5, 2.5, 3 mJ/cm2. Decide about further data points.

Achievements

1. Acquired tr-RIXS data with 4.0 mJ/cm² laser power for 21 delays between -2 and +10 ps at 853 eV. including static XAS and dark hRIXS runs. Totally collected 210 minutes of data i.e. 10 minutes per delay
2. Acquired tr-RIXS data with 4.0 mJ/cm² laser power for 21 delays between -2 and +10 ps at 853.44 eV. including static XAS and dark hRIXS runs. Totally collected 210 minutes of data i.e. 10 minutes per delay

Problems:

1. hRIXS camera number of readout ports was set to 1, increasing the readout time. Set it to 2.
2. Elastic line drifted about 40 meV over 3 hours (first and last trRIXS run at 853)