achievements:

• change the optical laser to 2 um
• found focus of 2 um beam
• found saptial overlap
• course timing was checked
• looking for fine timing using SiN

problems:

• fine timing signal not seen yet

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, 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

achievements:

• knife edge scans of OL to find lens position corresponding to the smallest beam size
• knife edge scans of FEL to determine the position to proceed for spatial overlap
• liquid jet was set up and it's running since afternoon
• measured x-ray absortion via the diode in the CHEM-DIAG

problems:

• difficult to perform knife edge using 3 um after finding rough spatial overlap useing the green laser. The issue is the following: becasue the diode does not see the direct OL beam but rather we see scattered light at the diode, even when the direct beam is blocked by the sample holder
• since spatial ovelap cannot be found we siwtch program
• APD voltage device goes into error above 310 V and at 310 V after some minutes it goes also into error ->
• the APD signal shows strong fluctations in the background

HED would like to report that since 2 days the SASE2 beam is instable.
The attached movie shows, on the left (90° rotated, so up-down is left-right)
the beam at the end of the HED hutch, and on the right its the same beam
at the end of the XTD6 tunnel (HED-POPIN diamond window).

It jitters horizantally by more than 1.5 diameters.

We are taking data for users, but due to the jitter, only every 4th image is usable,
which mean also 3 out of 4 targets are lost.

We are haveing near collimated beam with CRL1 (XTD1) 1,6 and CRL2 (XTD6) 2,3)
to generate a large field of view on the target.

Ulf

Achievements:

1. Performed knife-edge scan. The beam size is currently at 5 um x 120 um.

2. Aligned the spectrometer at O K edge (2.8 pixel FWHM, 110 meV resolution, 4800 resolving power)

3. Performed energy calibration at O K edge (39.3 meV / pixel)

4. Setup the liquid jet environment for water.

Problems:

1. The elastic signal at CoO sample is very weak, so the alignment was done on the multilayer sample.

2. The motor of the ice crusher has some movement problem.

Achievments:

- Align DPS to remove clipping of X-rays

- Get better focusing of PPL in the chamber

-Coarse timing with SIGNAl of OPA

-Switch back to 3 um PPL settings

Problems

-It was hard to work with DPS without motorized stages

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

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, 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

In the public status display, it looks like FXE is taking the beam even though their shutter is closed.

Moved out MONO, aligned SDL without MONO

Looked at both beams on DES

Struggled to get the same beam size with SDL inserted compared to direct beam (~8 um); fixed by adjusting slits

Major beam-pointing issues w/ the upper branch on the x-ray eye, even when all `fine` motors were off

Experimented w/ turning off  certain `coarse` motors at a time

• Aligned both branches of the split-and-delay line.
• Brought the beam into the experimental hutch to image it on the x-ray eye; the sample hexapod is not moving (again?); the values keep changing, but the device clearly does not move

PLEASE INVESTIGATE TOMORROW

• Looked at the beam on the Zyla (Zyla is still in)

TODO for tomorrow:

• Make x-ray eye work
• Use the x-ray eye, measure pointing stability (both beams) until Bertram arrives
• With Bertram, do timing scans on x-ray eye and hope to see interference fringes

- 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.

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

We tested pulse on demand scans with scantool and confirmed that there is only one shot per scan point. This was used to print the footprint in a LIf crystal.

We took caustic scans for 1D diamond lenses using a wire and using specles to extract the beamsize.

After realignement of M1 and M2 we could solve the problem of the elogated beamprofile. Different lens setting were prealignd for the use in combination with the NFL.

We took data for several 1D diamond lenses together with a Vycor sample to extract the beamsize from the specles.

Instability observed today at 14:05, reported to PRC and BKR, including RC: We saw RMS jitter amplitude of up to 4 mm at FXE imager. The jitter was also seen by the upstream XGM with 100 um RMS amplitude. So it is something from the source.

This instability is suddenly appearind/disappearing and was absent over night and started this morning at 7h to occasionally turn on. It appear approx. everz ~30 mins for a few minutes.

We were set-up for 5.7 keV photon energy in SASE1. We made a test with BKR to change this energy to 9.3 keV. This had an effect on our two-color setup:

The first color pulse energy increased. See att 1. Green is the reference at 5.7 keV, blue is at 9.3 keV.

Att 2 shows the XGM history: pulse energy went up to 200 uJ in SQS XGMD during the change.

the users are unhappy about the increase of pulse energy in the pump pulse, because the ratio of pump versus probe is optimized with the setting where SASE1 operates at 5.7 keV.

we plan to record continuous delay scans (about 1 day for each scan) for the rest of the week, and pump-probe settings should be constant over time.

- Tunnel + experimental hutch alignment (Mirrors, CRL1 and CRL2)

- Aligned main devices: Optics Peter, x-ray eye, EPIX and Zyla and pin holes.

- Tried some alignment of the NFL (1D) lenses with pin hole and not pre focussed beam. We found a lot of scattering from pinholes which dominates the signal on our x-ray eye. This task has to be redone with CRL2.

- We aligned magnetic beamstop

- We moved sample stage inside the beam (do not move optics peter!)

- We insert CRL 2 and took some data with EPIX and Vycor. We checked the beamprofile with x-ray eye it looks elongated.

Problems:

- Timescan is not working

- lot of scattering from pinholes when using large beam on NFL