Machine went down overnight (4AM and 6AM) and could not be properly restarted by BKR.

Ongoing tuning is proceeding with RC onsite since 6AM; Instruments are informed and in direct contact to BKR.

Status 09:45AM: SA1 ~3mJ; SA2: ~500uJ; SA3 being restarted

Status 11:10AM: Beam restored in all SASEs; SA1 delivery from 10AM; SA2 delivery from 11:10; SA3 delivery from 10:45

X-ray delivery

• 7.8 keV, up to 260 pulses at 1.1MHz, ~3 mJ

Optical laser delivery

• PP laser, stable delivery

Achievements/Observations

• NKB focus optimized with reduced PSLIT (both MKB and EHU) opening
• Found the orgin of the BG (mostly from AGIPD gun shield)
• Stable AGIPD operation

Issues

• Beam slitting with PSLITs & IRU_SLITs does not help in reducing the BG from the AGIPD Gun-shield
• Placing additional Pb shield on the injector tip does not help (BG source is in between injector and AGIPD)

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.

X-ray delivery

• 7.8 keV, up to 260 pulses at 1.1MHz, >4 mJ

Optical laser delivery

• PP laser was down since 00:48.

Achievements/Observations

• NKB focus optimized and beam cleaning partially done
• Damaged IRU slit-4 has been rearranged and replaced
• Stable AGIPD operation

Issues

• Beam on AGPID seems still too big and beam cleaning did not really work (we may need to close PSLITs during the next shift)
• IRU_SLITs are too close to the X-ray beam and one blade in IRU_SLIT-4 was damaged by X-ray
• ~10 pixels in Q2M1 overexposed
• SA1 PPL Amphos down since 00:48

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

• 7.8 keV, up to 30 pulses at 94 kHz, 3 mJ

Optical laser delivery

• No laser

Achievements/Observations

• Trying to solve issues

Issues

• AGIPD's asics interlocked several times. Marcin was informed and he tried to solve the issue remotely but did not work.
• Marcin observed that the AGIPD's chiller temperature was increasing since afternoon and not going down below -16 degree. Probablly the chiller is no longer at proper state. Macrin was onsite and tried to solve the issue without success. Informed to detector group
• Difficulties with alignment of direct beam path until NKB

End of Euler shift: all 3 SASE2 mirrors are now working with the Euler MDL.

We left the beamline aligned to HED, with M1,M2 on Pt for upcoming HED experiment at 18 keV.

Pre-absorber closed, CRL1 out, Solid attenuater with some diamonds.

euler MDL was calibrated for all three mirrors.

Optics setpoints saved in XRO setpoints for MID and HED

Second iteration and sanitty test for vertical mirror motion (Y) and vertical beam alignment (ROLL)

Vertical motors were calibrated and offsets saved in Euler MDL (no calibration of motors done so far - this should be performed during ramp up after WMP)

Calibration values are

Rz=-8.7805

Ty=-4.11

Rx=-4.53

PITCH=8.58

ROLL=4.2063

Residual horizontal parasitic motion is within 2urad for M3 - for vertical beam alignment, the residual horizontal parasitic motion is even less.

With Euler MDL, mirror can now be moved and the beam will mostly stay on the experiment screen.

Setpoints for HED set in XRO setpoints 'B' (8.8keV B4C)

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

# Morning shift summary

Giuseppe, Martin

* achievements
- continued tr-RIXS measurements
- good beam conditions
- added new alarms to give warning if parameters are wrong for certain measurement type
- created new karabo device to calculate the fluence and train-averaged pulse energy in nJ from pulse-resolved HAMP values (see new scene in Main)

* problems
- none

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)

On multiple occasions this morning, the number of bunches was reduced to 1 without actions from our side.

Looking at the history of SA1_XTD2_BUNCHPATTERN/MDL/CONFIGURATOR, we noticed changes were applied by this device, presumably originating from one of the watchdogs in SA1. This kind of silent changes is particularly inconvenient and could be easy to miss if one is not constantly monitoring that the number of bunches remains the same. Given that there are dozens of watchdogs in SA1, it is at best cumbersome and time consuming to track the origin. Finding the origin of the restriction needs to be made easier.

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

# Late shift summary 29.09.2023

Laurent, Phuong
## Achievements
- Continue tr-RIXS
- Laser fluence scan
- Check PPL 266 nm power
- Setup DAMNIT

## Problems:
- online analysis not displayed on gui1 server fixed by DOC

## Plan for the night:
- continue tr-RIXS
- monitor energy and position drifts

Shift sumary for 29.9.2023

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 without laser for 1 to 2 hours
• PP laser coarse timing

Issues

• Issues with injection, solved later in the shift
• Difficulties to find fine timing
• Issue with migrating data to offline cluster, solved by DOC

Shift summary for 27.9.2023

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, delivered from 9:45 on and was stabilizing over the day
• ns laser for rayleigh scattering, stabe delivery

Achievements/Observations

• Aligned MKB trajectory and optimzed background
• Scattering laser aligned with X-rays references and overlaped with particle beam
• Few runs with sucrose while trying to optimize injection

Issues

• PP laser was still drifting in energy and pointing, better stabilized towards the end of the shift
• Difficulties with injection, tried sevral times and did not improve much
• Slope in pulse energy along the pulse train, up to 40% change from first to last pulse
• Significant background AGIPD after correcting beam trajectory

Achievements

• Characterized optical laser spot at sample

Problems

• FEL beam had very unstable intensity and spectrum. As a result no useful data could be collected during the night
  • FEL pointing seemed to be stable on all tunnel imagers. The issue was communicated to BKR, and they said that things looked fine from there perspective.
  • Large fluctuations in spectral distrubtion at SCS spectrometer were observed. See video at https://syncandshare.xfel.eu/index.php/s/emtwonCsQJJqpz6
  • Oth-order beam on SCS pop-in showed large intensity fluctuations with ~50% of the time showing no beam at all