X-ray delivery

•  9.3 keV, 1-120 pulses,
• good stabiltiy, lowish flux ~900uJ, but experimental requirements were met

Achievements/Observations

• Finished doule slit measurements at micron beam
• Alignment to direct beam
• Sample position for the sand paper found
• Some sand paper test speckle patterns measured

Issues

• Alignment was a bit painful without the NKB and EHC cameras - switch to ZYLA at EHC made ALAS alignment much easier
• diff pump does not transmit much of direct beam without interference and requries tight power slits (known limitation)

Instrument status

• AGIPD HV off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.
• Vacuum valves closed.
• EHU PSLIT closed around direct beam to approx 1.2 x 1.2 mm
• sample moved up by 10mm so both rows accessible in direct beam
• current 'focus' sample position is approx location of sandpaper from evening measurement (lower row, darkside), 10mm in +x moves out of beam

To do for next shift

- continue direct beam speckle measurements (See entry elog:138)
- quite a bit of scattter on AGIPD from direct beam and especially sandpaper samples.
- transmissions of at least ~1 % level are detector safe (no pixels in AGIPD medium gain)

X-ray delivery

• 9.3 keV, 120 pulses
• Good Beam Stability -~1mJ

Achievements/Observations

• Double Slit and V-Pattern Interference Measurements
• Nearfield Ptycho-Scans
• Nano-KB (@Richard)

Issues

• Office network webcams extremely slow in control room
• X-ray delivery jddd display computer frozen again (related to ubuntu update?)

Instrument status

• AGIPD HV off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.
• Vacuum valves closed.
• YAG in-beam in interaction region.

To do for next shift

• End of beamtime - Nearfield ptychography experiment not completed, may require time during the week
• NanoKB partially aligned  - see dedicated post

Staff: AR, KK

X-ray delivery

• 9.3keV

Optical laser delivery

• None

Achievements/Observations

• Both KB mirrors are moved to Ru coating
• Nano KB and inlineMic are aligned focus optimzed
• Several ptycho. datasets are measured with single-pulse and 320 pulses per train

- Measured the speckle patterns using EPIX detector to estimate the beamsize focused down by 1D lens (Row 13).

- Heat load test to NFL #18 with 50 bunches.

- Measured the speckle patterns with 2D focusing lens to estimate the beamsize. wire edge scan?

- Local optics hexapod had some issue in moving while alignment. DOC helped us to solve it.

-Sample hexapod is not working, need to be checked in the morning.

X-ray delivery

• 9.3 keV, 1-352 pulses, 0.8 mJ, stable delivery

Optical laser delivery

• 800 nm, 1-01 pulses, 282 kHz, stable delivery
• ns laser for illumination

Achievements/Observations

• Alignment for NKB focusing setup were finished
• Al scattering signal was observed on AGIPD, need to move CSS with IRU-SLIT-1 opening
• Dammit currently running on the "AGIPD" PC, automated data processing is on but will only process the first 100k frames.

Issues

• No major issue to report

Day shift 28.02

Got the beam, aligned it up to the TCC, mirrors in 3 mrad configuration, checked positions for the CRLs. Optimised beam at the HAPG. Beam stability was fine, energy up to 1,5 mJ at 8.2 keV, and up to 1 mJ at 9.1 keV (used for the spectrometer calibration). 

Late shift 28.02

Tune back from 9.1 to 8.15 keV, beam was a bit shifted.

Spectrometer calibration and elastic scattering showed very precise beam photon energy.

Night shift 28.02-1.03

Night was dedicated to installation and alignment of CRL4. Start pumping IC1. There were a lot of issues with carabo (HED vacuum scene) DOC is informed.

Day shift 1.03 

Continued CRL4 a and b alignment. No big issues, beam is mostly fine, energy is also fine, but sometimes beam stabilization (feedbacks) stops working and observing.

X-ray delivery

• 9.3 keV, 1-352 pulses, 0.8 mJ, stable delivery

Optical laser delivery

• 800 nm, 101 pulses, 282 kHz, stable delivery
• ns laser for illumination

Achievements/Observations

• Nanofocusing setup alignment was finished
• Ice detection was tested

Issues

• No major issue

X-ray delivery

• 9.3 keV, 202 pulses, X-ray intensity had slope over train, 30 % difference between first and last pulse in the train
• Sometime strange intensity slope was observed (screen shot was attached)

Optical laser delivery

• 800 nm, 68 pulses, 188 kHz, Treacy compressor issue, lost 3 hours in morning
• ns laser for illumination

Achievements/Observations

• Nanofocusing setup with pump-probe experiment has started
• Collected TR-SFX data

Issues

• Treacy compressor issue, lost 3 hours in morning
•  X-ray intensity had slope over train, 30 % difference between first and last pulse in the train
• Sometime strange intensity slope was observed  (screen shot was attached)
• Run_Controller stopped without any action from us

Beam delivery SASE 8,25 keV, 1300 µJ. Intensity stable,
but beam jittery in horizontal. 

PRC (Dommach) did a ZZ around 13:00 and switched off coolling of M1 in XD1, but no effect on beam jitter.

We decided (around 18:00) that we will use intermediate focus (CRL1 arms 4,6). This is not providing optimal
properties in terms of divergence and chromaticity for our imaging experiment, but the jitter
prevented us from taking any meaningful data. The result is that the jitter is significantly reduced.

We are taking data since 20:00. Quality is moderate but we can live with it.

X-ray delivery

• 9.3 keV, 202 pulses, 564 kHz, intensity slope was flat

Optical laser delivery

• 800 nm, 68 pulses, 188 kHz. stable delivery
• ns laser for illumination

Achievements/Observations

• Continue nanofocusing setup with pump-probe experiment
• Continue Collecting TR-SFX data

Issues

• Run_Controller problem still persists, it stopped without any action from us

X-ray delivery

• 9.3 keV, 202 pulses, 564 kHz, intensity slope was fine

Optical laser delivery

• 800 nm, 68 pulses, 188 kHz. stable delivery
• ns laser for illumination

Achievements/Observations

• Continue nanofocusing setup with pump-probe experiment
• Continue Collecting TR-SFX data

Issues

• uTCA timing was shifted about 3 ns against X-ray and PP-laser

X-ray delivery

• 9.3 keV, 202 pulses, 564 kHz, intensity slope was fine

Optical laser delivery

• 800 nm, 68 pulses, 188 kHz. stable delivery
• ns laser for illumination

Achievements/Observations

• Continue nanofocusing setup with pump-probe experiment
• Continue Collecting TR-SFX data

X-ray delivery stable in intensity, 1300-1400 mJ at 8150 eV SASE.

user experiment 3430 (Zastrau / Mishchenko)

Horizontal jitter compensated with intermediate focus (by overfocusing with CRL in XTD1, and focus on target with CRLs in HED OPT.
Beam drifts compensated by M2, M3 mirror feedback

RELAX laser shots on 10 um Cu foils, last 12 h pumping a Cu 22+ resonance K line. probing laser plasma at 0, 5, 10, 20 and 50 um spatial offset

Completed our data set. We now have 100fs resolved 2d transmission images and K-resonance from +1 ps to -100 ps delay time.

Successful user experiment.

The intensity of the Seeding decreesed from 850 uJ to 550 uJ during the time between 20:00 and 02:00.

The Spectral purity also got worst, the beam in HIREX looks to have more SASE shoulders.

Between 18 and 20 we show a prossible transiant signal, PPL, of the lower branch. But a problem with the monochromator in the MID opt Hutch trigger the valve to close. After we where not able to see the signal possible effect of laser or X-ray inestabilities.

Problems with the liquidjet, the nozzel got clogged.

Started the aligment of the upper branch of SDL

X-ray delivery

• 1-202 pulses, 564, 282, 141 kHz, stable delivery

Optical laser delivery

• 800nm, 50 fs, 282 kHz, stable delivery

Achievements/Observations

• Alignment for Pump-probe experiment was finished
• Sample was tested

Issues

• No major issue today

X-ray delivery

• 1-202 pulses, 564, 282, 141 , 70.5 kHz, stable delivery

Optical laser delivery

• 800nm, 50 fs, 282 kHz, stable delivery 

Achievements/Observations

• Resasnable amout of data was collected
• Sample was tested

Issues

• No major issue today

X-ray delivery

• 1-202 pulses, 564 kHz, stable delivery
• Beam was down from 06:08

Optical laser delivery

• 800nm, 50 fs, 282 kHz, stable delivery 

Achievements/Observations

• Resasnable amout of data was collected

Issues

• No major issue today

Beam delivery for proposal 3378

Achievements/Observations

• Collected data on liquid H20 and D20
• Found conditions where only ice were seen. approx. 4h of ice data taken. Starting to look at correlation maps
• Background at 0.88mm nozzle distance measured

To do for next shift:

Continue taking data

Beam delivery for proposal 3378

Achievements/Observations

• Collected large amounts of data for the user program on water crystallisation and angular correlations

To do for next shift:

Continue taking data

Update of the damage tests at SQS.

Yesterday (15.04) SQS staff created a focused beam on our sample using a small YAG fragment we have placed on the holder.

Due to the unusual position, the beam is full of aberrations but it looked small enough for our purpose. Estimattion of the size is difficult atm but it is our intention to measure it with imprints.

We managed to align the sample 1 (silicon, uncoated) in grazing incidence at 19 mrad and found the damage threshold at current focusing conditions at around 100 uJoule (looking on the SQS XGM).

We managed to align also on sample 2 (silicon, B$C coated) at the same grazing angle and we found a threshold at around 200 uJoule.

We started to do systematic spots at various energies, using the GATT

One difficulty is that the manipulator is not enough precise to scan several mms in grazing incidence, the sample has to be realigned along the scan and we cannot find a clear centering on the sample due to the lack of reproducibility.

In the late shift we started to do imprints to characterise the beam spot.

Overall the experiment is on a very good status. Until now, we explored only single pulse damage. Today (16.04) we will try multipulse damage and single pulse damage at 9 mrad.

 

Today we comtinued the program, changing to 9mrad amd 15mrad and doing also multipulse. We had a short interruption at around 15 to extract some samples and to realign Sample 3.