- While FEL IMG with YAG screen was inserted in SA1, EPS/MPS was not limited to the expected 2 bunches, but to 30 bunches; 
- It was found the condition #3 ("SA1_XTD2_VAC/Switch/SA1_PNACT_Close") at the EPS Mode-S was disabled which should be always enabled; 
- Condition #3 has been enabled again and now SA1 is limited to 2 bunches, as expected when YAG screen is inserted. 

Further investigations will be done to find why and when it was disabled. 

SA2 cell#5 undulator segment moved at ~09:45AM Fri to 25mm without aparent reason and undulator experts need a ZZ to exchange power supply; FEL instensity dropped from 230uJ to 60uJ s consequence.

RCs are preparing south branch for the iminent ZZ. HED is informed.

**Update: ZZ finished by 12:10; recovered performance and re-started delivery by 13:30.

Laser status:

After the laser issues listed in https://in.xfel.eu/elog/OPERATION-2024/99 the late shift was finally able to find a timing setting for the amplifier trigger that was beyond stable settings under usual conditions, but which allowed to continue taking data runs for the rest of the beamtime reliably. The users were already able to reveal indications of a pump-probe signal in their data.

The issue itself remains but didn't show up in form of unstabilities anymore. After the beamtime LAS took some effort to investigate and narrow down to either a faulty trigger going into the front-end amplifier or on the front-end amplifier itself. To the best of our knowledge this circumstance will need to involve EEE support or even a service from the manufacturer and cannot be solved solely by LAS. LAS ensured that the highest priority will be to deliver stable laser pulses for next week's beamtime as well.

FEL status:

we found the FEL poynting to be very stable troughout the last weeks beamtime (despite some short down-times), which allowed to reliably verify the spatial overlap.

31.01.2024 (Day shift)

X-ray delivery

• 10 keV
• 1200 - 400 uJ (significant pulse energy slope within train)

Optical laser delivery

• None

Achievements/Observations

• Flat fields and timing scans were measured for AGIPD (1.1MHz, normal CDS mode)

Issues

• Interlocks issue causing beam to be interrupted when the beamline shutter was open https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Issues/near/32289
• Opening EXP hutch gate valves resulted in vacuum issue https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Alignment/near/32195
• Pulse pattern decoder recorded empty arrays, even though data were visible in Karaboo https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Issues/near/32299
• AGIPD timing issue caused by the wrong Trigger Source https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Detector.20Status/near/32408

To do for next shift

• Continue with the detector program

X-ray delivery

• 6 keV, 2.6 mJ/pulse, stable delivery

Optical laser delivery

• 800nm PP laser, stable delivery

Achievements/Observations

• NKB focus optimized and PSLITS optimized
• Beam going through IBS camera
• PP laser rough timing checked w.r.t. X-ray
• Catcher and injector motors (X, Z) are aligned well with about 1.5mm offset in X

Issues

• Manifold-MDL issue (reported in Issues tap)
• SPB_IRU_LIQUIDJET/CAM/1 (IRU nozzle insertion camera) is not working. Power cycle required.
• SPB_EHU_Valve closed 2-3 times due to vacuum interlock
• Space (KF50 pipes) in the super-structure was too long for the user injector (nozzle rod). After taking off small spacer, nozzle is very close to the injector valve during insertion. Please check it out whether we can find any better solution or not.

X-ray delivery

6 keV, 2.4 mJ/pulse, stable delivery

Optical laser delivery

800nm PP laser, stable delivery

Achievements/Observations

NKB focus cslits optimized
Some progress with AGIPD background although we still need to improve
Catcher and injector motors (X, Z) are aligned well; with defroster, had under 5mm offset in X
Managed to get a jet and overlap with X-rays.

Issues

Beckhoff flowmeters were disconnected and we were not sure which ports to connect, maybe spent 45min to connect to the right ports and restart device.
Helium flow meter was on but not updating, had to restart it too.
Marco noted actual measured flow at beckhoff VS HPLC set flow was perhaps too low, not sure
Vacuum with injector improved, issue was related to nozzle preparation, however even after this fix the chamber pressure was just over the AGIPD interlock. After tuning gas/liquid flow managed to go under it, but possibly this can also be improved.
Often number of pulses was being changed without us requesting it.
One AGIPD module stopped working after moving quadrant.
DAQ data aggregator crashed a few times, Steffan Hauf will look into this issue after we finished the shift.
Could not move one of the AGIPD quadrant (Q4) due to interlock
Background in Q1 and Q3 needs to be optimized, and/or quadrants needs to be moved.

**X-ray delivery**

- 6 keV, 3.2 mJ/pulse, stable delivery

**Optical laser delivery**

- 800nm PP laser for jet illumination, stable delivery

**Achievements/Observations**

- NKB focus checked and IUT_Slits optimized
- AGIPD quadrants position finalized
- Measured a lot of water BG runs and few runs with Au nanoparticles (sphere with ~50 nm in diameter)

**Issues**

- SideMic data not saved properly (empty array).
- Found relatively high BG when nozzle is IN since the distance in between nozzle tip & the interaction region is ~100um (even 80 um in some cases).
- DA issue (DAQ was stuck in changing) although all the DA looked healthy. DOC fixed the issue (temporarly) together with Egor, Florian, and Steffen.
- Runs callibration were not working

X-ray delivery

• 12.72 keV, 10 Hz, NOT stable delivery, pointing drastically changed in the afternoon, presumably due to the train-on-demand operation at SASE2

Optical laser delivery

• 487 nm ns laser (not used)
• 800 nm PP laser for sample illumination

Achievements/Observations

• Beam is aligned for IRDa
• lysosyme date was collected for JF4M geometry

Issues

• X-ray pointing changed in the afternoon, we have to figure out why and whether we can avoid losing trajectory
• Beam is currently clipped and EHC_SCR, @Romain Letrun , @Adam Round please take a look tomorrow
• Detector background was not optimal, might require more work tomorrow
• Roadrunner RX motor did not move, in Karabo, was giving error messages @Adam Round please take a look, maybe resetting the roadrunner outside of Karabo can help
• AGIPD MFPGA2 issue (keep acquiring) which was solved by power cycle

Pulse energy fluctuation observed after full train operation in SA2 starts.

X-ray delivery
- 12.72 keV, 10Hz, ~1.4 mJ/pulse, stable delivery 

Optical laser delivery
- 487 nm ns laser for pump-probe
- 800 nm PP laser for jet illumination, stable delivery

Achievements/Observations
- AGIPD BG optimized (DiffPump realigned)
- IRDA focus optimized (EHC_CRL arm10 (1mm pinhole) inserted)
- Completed dark state measurement of the main sample (more than 4 hours of measurement time)
- Collected PP (pump-probe) dataset with 5 us time delay (about 3 hours of measurement time; Jet was quite stable during the 3 hrs measurement)

Issues
- AGIPD module Q3M2 was not healthy. After another power cycle, it recovered.
- X-ray pulse energy was relatively low in the beginning of the shift. It was partially recovered after running the launch optimization by BKR.

Continuous pointing drift in horizontal direction.

It may trigger a vacuum spike at SPB OH (MKB_PSLIT section) at 21:07 pm.

X-ray delivery

- 12.72 keV, 10Hz, ~1.4 mJ/pulse, continuous beam drift in the horizontal direction observed

Optical laser delivery
- 487 nm ns laser for pump-probe
- 800 nm PP laser for jet illumination, stable delivery

Achievements/Observations
- Collected PP (pump-probe) dataset with 5 us time delay more than 12 hours
- Collected 3 runs (5 minutes run) of dark state in the end of the shift
- Jet was quite stable most of the time

Issues
- Continuous beam pointing drift in the horizontal direction observed
- Vacuum spike at MKB_PSLIT section trip the beam shortly which might be related to the beam pointing drift

X-ray delivery
- 7.0 keV, up to 202 pulses at 564 kHz, 1.0 mJ.
- Average pulse energy was about 1.9 mJ on Tuesday and Wednesday. It has to be discussed with BKR tomorrow morning.

Optical laser delivery
- ns laser for jet illumination

Achievements/Observations
- BG measurement with water, buffer low salt
- Lysozyme measurement for geometry file
- Data collection for six different sample concentrations [2 x 15 minutes runs]

Issues
- Pulse energy is very low as compared with Tuesday and Wednesday in this week.
- Damage found on IRU_SLIT4 Top and Bottom blades.
- NKB focus moved by ~20um at around 15:00 (during the handover period). SideMic X moved +20um to compensate it.

X-ray delivery

• 7.0 keV, up to 202 pulses at 564 kHz, 1.0 mJ.

Optical laser delivery

• ns laser for jet illumination

Achievements/Observations

• Data collection for user sample through column

Issues

• Pressure spike while rotating nozzle tripped AGIPD
• Temperature of ASICs of Q2M1 module too low and not easy to turn it on (issue solved after changing the bath temperature to -27 degreeC)
• Julabo chiller issue again (In the end, set temperature changed to -29.5 degreeC and continued the experiment)
• Another 2 ASICs in Q2M2 and Q2M3 seem unhappy

X-ray delivery

-12.40 - 12.82 keV, XDT9 XGM ~0.81 mJ@ end of shift

Optical laser delivery

-800 nm laser for jet visualization
-487 nm ns laser for pumping

Achievements/Observations

-Focus IRD
-Collected 10 ns SFX data

Issues

-AGIPD chiller was down

X-ray delivery

• 12.78 keV, ~1.3 mJ

Optical laser delivery

• 800 nm laser for jet visualization

Achievements/Observations

• Collected SFX data
• Calibration date for HIREX measured (at different X-ray energy)

600um thick CVD diamond (XTD2 attenuator) seems damaged

Attachment 1: 600um thick CVD diamond (Arm 4) OUT

Attachment 2: 600um thick CVD diamond (Arm 4) IN

X-ray delivery

• 6 keV, ~2.8 mJ, stable delivery

Optical laser delivery

• ns laser for particle visualization

Achievements/Observations

• NKB focus optimized
• particle injection tested with gold nanoparticles
• ns laser roughly aligned with particle beam
• Julabo chiller (AGIPD) is still on target (-32 degree)

Issues

• XTD2_ATT Arm4 (600um thick CVD) is damaged (most probably last week)

X-ray delivery

• 6 keV, ~2.7 mJ, stable delivery

Optical laser delivery

• ns laser for particle visualization

Achievements/Observations

• NKB focus optimized
• ns laser aligned with particle beam
• particle injector position optimized
• measured 3 samples: roughly 2 hours per each sample
• one sample was measured with and without He gas
• Julabo chiller (AGIPD) is still on target (-32 degree)

Issues

• Beam drift in vertical direction: Rz has to be corrected during the measurement and moved by 0.2 mm in total in whole day (~18 hours)

X-ray delivery

• 6 keV, ~3.0 mJ, stable delivery

Optical laser delivery

• ns laser for particle visualization

Achievements/Observations

• measured 1 sample roughly for 9 hours (hit rate went down in the afternoon)
• Julabo chiller (AGIPD) is still on target (-32 degree)

Issues

• NKB mirror drifted in vertical direction: it was optimized again at around 9pm
• extremely low hit rate even with sucrose (extremely few particles were observed in sidemic, 1 particle within a few seconds): maybe the aerodynamic lens should be cleaned