X-ray delivery

• 6.3 keV, 3-4 mJ/pulse, 1-352 pulses at 1.13 MHz

Optical laser delivery

• PP laser, 1030 nm, 226 pulses at 1.1 MHz, stable delivery
• ns laser for rayleigh scattering, stabe delivery

Achievements/Observations

• Solved the issues with sampel injection
• Collected data with laser 30 min
• PP laser time zero aligned

Issues

• IRU_Slit4 was in position to the beam
• It took time to aling all slits to reduce the scattering in low q

X-ray delivery

• 6.3 keV, 3-4 mJ/pulse, 1-352 pulses at 1.13 MHz

Optical laser delivery

• PP laser, 1030 nm, 352 pulses at 1.1 MHz, stable delivery
• ns laser for rayleigh scattering, stabe delivery

Achievements/Observations

• Several tens of datasets were collected using two different laser polarization (0 degree and 45 degree)
• During the data collections PP laser phase shifter delay scans were used.
• PP laser time aligned to zero and spatial overlapped was checked.

Issues

• The cross talks between SASE-1 and SASE-2 was more than it expected.
• Beam position, pulse energy as well as intra-train pulse energy were varrying. (BKR managed to solved it before the evening)

X-ray delivery

• 6.3 keV, 3-4 mJ/pulse, 1-352 pulses at 1.13 MHz

Optical laser delivery

• PP laser, 1030 nm, 352 pulses at 1.1 MHz, stable delivery
• ns laser for rayleigh scattering, stabe delivery

Achievements/Observations

• Lots of datasets were collected using two different laser polarization (0 degree and 45 degree)
• During the data collections PP laser phase shifter delay step scans were used.
• PP laser time aligned to zero and spatial overlapped was checked.

Issues

• No major issue today

Staff: JK, CK, KL, AS

X-ray delivery

• 8.4 keV, up to 260 pulses at 1.1MHz, 3.5 mJ

Optical laser delivery

• No laser

Achievements/Observations

• Direct beam path confirmed (MKB_MVP supporting structure issue)
• NKB focus optimized
• Two power slits (MKB_PSLIT and EHU_PSLIT) optimized

Issues

• 7.8 keV is not reachable due to limited motion of undulator gap; 8.4 keV, the used X-ray energy, corresponds to 11mm SA1 undulator gap
• AGIPD chiller issue not solved.

Instrument status

• AGIPD HV off.
• AGIPD's Chiller is off.
• AGIPD gate valve closed and pinned.
• Attenuators set to thickest diamond.

To do for next shift

• If possible, fix AGIPD ciller issue
• If AGIPD will be available, install mirrors for PP laser and continue IHR program

X-ray delivery

• 1.3-1.7 mJ, 10.7 keV, 1-100 pulses, stable delivery

Optical laser delivery

• None

Achievements/Observations

• Aligned beam trajectory for 10.7 keV direct beam
• Optimized the microscopy table position and references
• Alingment of spectrometer and first and second crystal

Issues

• Intensity flucutations when SA3 changing number of pulses, it is related to automatic kicker adaptation.
• AGIPD preview update speed was slow

X-ray delivery

• 1.3-1.7 mJ, 10.7 keV, 1-100 pulses, stable delivery

Optical laser delivery

• None

Achievements/Observations

• Aligned beam trajectory for 10.7 keV direct beam
• Installation of imaging optics

Issues

• Intensity flucutations when SA3 changing number of pulses, it is related to automatic kicker adaptation.
• AGIPD chiller was not working

X-ray delivery

• 1.3-1.7 mJ, 10.7 keV, 1-100 pulses, stable delivery

Optical laser delivery

• None

Achievements/Observations

• Aligned beam trajectory for 10.7 keV direct beam
• Installation of imaging optics

Issues

• No major issue today.

X-ray delivery

• 1.3-1.7 mJ, 10.7 keV, 1-100 pulses, stable delivery

Optical laser delivery

• None

Achievements/Observations

• Aligned beam trajectory for 10.7 keV direct beam
• Installation of imaging optics

Issues

• No major issue today

X-ray parameters: 20 keV,  352 pulses, ca 300 uJ

• running user samples.

experiment going overall well.

X-ray performance:

• Good - still crosstalk issues with SA3 so we have to call BKR everytime we change bunches to 30 (alignment mode), or 0 (hutch intervention).

AGIPD took damage to one module yesterday (top left) leading to a short in the high-voltage line but is still performing well with only 7/8 modules. We will investigate what the extent of the damage is after the experiment.

03 Jun 2023, 13:46

We called the BKR to ask what they can do about our pulse energy being 50% (~160uJ and slowly dropping) of what it was since we made our hutch intervention (with 0 bunches). BKR were asked to organise a time slot with PRC and the other instruments to make an intervention to try to increase our pulse energy.

We have one cell (CH4) which is low-Z and would require higher pulse energies for x-ray heating. We are flexible as to when this intervention happens this afternoon as in the meantime we can continue to work with other cells.

Vacuum issue at HED

At 18:26 the vacuum failed in the HED CRL3 chamber in the OPTs hutch. The vacuum failed in the section and tripped the valves in the OPT hutch; it went from 1e-8 to 5 mbar in seconds. The leak is confined to the CRL chamber -- the sections upstream and downstream are not compromised and still have good vacuum. Therefore we believe the leak to be in one of the bellows of the CRL arms. This needs to be investigated tomorrow by the technicians.

The late shift is cancelled since we cannot continue with lens alignment. The night shift may continue with work on the DiPOLE laser - up to them.

BKR is informed that they may use the time for tuning.

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.

The late shift on the 13th fixed remaining problems with the DLD and the calibration pipeline.

The night shift was then able to collect data on O2 using the two-color mode. Systematic studies were done at different photon energies for both colors. This was done for full FEL intensity and 10%.

The day shift started to investigate if we see an effect changing the delay between the two colors. This turned out to be difficult because we lost the second color when changing the delay. BKR retuned for us with a delay.

Afterward, we asked BKR (Mathias and Mark) to re-tune the two color setup for short pulses.

Upcoming late and night shift should collect more data using the short pulses. Keep in mind to check and record the single pulse FEL spectrum upon each change on the undulator settings.

I started the upstream XGMs in XTD2, XTD1, and XTD10.

An XGM has two single-shot detectors, XGMD and HAMP.

The XTD2 XGMD amplifiers are damaged, thus I operate the XTD2 XGM with HAMP, which I usually use at > 18 keV.

In summary, the XTD2 XGM is fully operational, but I do not have a spare detector any more! Thus, a ZZ is organized for Monday 16.10. around 12:00 and Joakim and I will exchange the damaged amplifiers.

After setting timing witht he diode, we look at the PAM spectrometer and scan the laser timing a bit.  We found a clear change in the spectrum - at >t0, the spectrum was very attenuated and at t<t0, the spectrum was larger.  This persisted for many 10s of ps (very unexpected behaviour).

In attachment are the LA3 timing scene, the SQS delay stage, the BAM, and the spectrometer signal from Metro at t0. att. 1 - 4.  The averaged ratio shows the cut the best.  Unfortunately we do not have references on that, so we will ask Sergey or Bjoern to do it tomorrow.

We found that the intra-train timing feedbacks of the accelerator are off. We ask BKR to fix it, which took a while. Aparently, we have to communicate the need of the timing feedbacks (and BAM) more clearly.

Standard deviation along train is now 18 fs with feedbacks on, see att 5. Was around 100 fs without the feedback!

We take a run and manually move the PAM delay stage so we have a timing calibration for PAM.

run 32: Rubbish because DA03 got stuck.
run 33: scanning PAM delay stage manually. device: SQS_AQS_LAS/MOTOR/WAVEPL_LMD2_1030. Typically taking 5um steps.

Went to the PAM delay stage position shown in att. 6, and had the PAM signal shown in att. 7

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.

Achievements:

- Improved the vacuum of the chamber slightly

- Found the spatial overlap between FEL and jet

- Found the spatial overlap between FEL and PP laser on pBN (but may not be the same on liquid jet)

Problems:

- Beam loss for 6+ hours, from 23.00h to 5.15h due to fuse tripping in the laser system of the electron gun

- While fixing the beam loss, the machine seemed to have trouble with timing. So if fine timing can't be found, perhaps it's worth it to check rough timing again.

- The rough pumps in the room are full of water. We solved this by taking 2 rough pumps and connecting them directly to the chamber.

- The antenna cable is too bulky. So the sample plate should only be rotated to -90 deg (-358.65 actual), as rotating the other way will severely tilt the sample plate.

Achievements:

1. Continued measuring time-resolved and static RIXS on water (run table in elog entry #103)

2. Periodically checked spatial overlap and BAM compensator in-between measurements.

3. Refilled and changed cold traps when necessary.

Problems:

1. Some icing issue, solved by changing the nozzle.

Achievements

1. Start cooling down the sample
2. Align the beamline and deliver the beam into the sample
3. Performed knife edge scans and enlarge the beam horizontal size to 350 um
4. Tuned the VHM bending by checking the hRIXS resolution
5. Performed energy calibration on the 1000 l/mm grating
6. Check XAS and RIXS of the NdNiO3 sample at 20 K, normal incidence, and peak A

Problems:

1. Nothing of note

Shift Plan:

1. Check static RIXS at a few different configuration
2. Check damage threshold with x-ray and laser
3. Find spatial and temporal overlap between laser and x-ray
4. Performed pump-probe XAS and RIXS