**X-ray delivery**
- 8.3 , 1600 uJ pulse energy

**Optical laser delivery**
- NS illumination
- 355 nm pump laser

**Achievements/Observations**
- Measured/tested various samples and different pump laser delays and illumination delays

**Issues**
- There was some sample that caused clogging in the morning

Concerning eLog entry #59, SPB PopIn:

The problem of the motor position, driving to the OUT position is fixed.
The MDL for driving the screens is correctly working again.

X-ray delivery

• 8.3 / 9.3 keV, 1400 uJ pulse energy, 1 hour down time

Optical laser delivery

• NS illumination
• 355 nm pump laser

Achievements/Observations

• PCS finished
• Preparation for the next experiment; mainly 355 nm.

SPB pop-in monitor was not dricing to the switch when we retracted it to the "out " position with the MDL this morning. This prevented us to use more than two pulses. We have moved the motor one step of 300 um up, which activated the switch and relased the interlock. This should however be fixed so that the "out" position in the MDL works as expected and the motor operates reliably.

X-ray delivery

• 9.3 keV, 1800 uJ pulse energy

• 1 - 202 pulses at 564 kHz

• Poor beam stability overall. Lots of intensity fluctuations and rather long time to recover after change of number of pulses in any beamline.

Optical laser delivery

• 800 nm, 113 pulses, 564 kHz stable delivery

• Illumination laser aligned

Achievements/Observations

• Aligned instrument

• Prepared illumination laser

• Shot PCS sample for a few minutes

Issues

• PCS sample clogged (at filter not nozzle) after a few crystal shots

• A few clogs with nozzle with lyzo, when X-ray were on, even far from the nozzle somehow the splash from the explosion grew on the tip

Staff: PV, TS, JK + external collaborators 

X-ray delivery:

10 keV, ~ 800 uJ, 128 pulses, tuning was needed for 10 min. 

Optical Laser:

No PP-laser for this week

Achievements / Observations:

Finalized alignment of X-ray setup

Issues:

No major issue today.

X-ray delivery:

10 keV, ~ 850 uJ, 128 pulses, tuning was needed for 1 hour 

Optical Laser:

No PP-laser for this week

Achievements / Observations:

Finalized alignment of crystals

Issues:

No major issue today.

self-seeding level in SA2 is currently very low (~100 uJ, about 50% in the pedestal), need more information on how to proceed - is there any chance to improve the seeding, or should we consider going to sase operation.

X-ray delivery:

10 keV, ~ 900 uJ, 128 pulses, tuning was needed for few hours

Achievements / Observations:

Alignment of crystals

Issues:

X-ray beam intensity was weak at 12.7 keV (100 uJ), so we decided to use 10 keV

X-ray delivery

• 18.8 keV, 260 uJ pulse energy

Optical laser delivery

• No optical laser

Achievements/Observations

• Experimental setup optimized, both instrumental side and PIXIE side
• X-ray beam focused to the PIXIE and transmission measurement was done with several different PIXIE operation conditions.

Issues

• No beam for ~4.5 hours due to ZZ.
• X-ray beam not found with IRDa InlineMic after focusing X-ray beam to IRDa sample plane.
• InlineMic Y motor is in error states. It has to be fixed during the day.
• upstream kapton window for the downstream vacuum pipe broken. The glue has become loose. No damage by X-ray was visible.

X-ray delivery:

20 keV,  250-400 uJ, 250 pulses, stable delivery

Optical Laser:

1030 nm, 850 fs, stable delivery

Achievements / Observations:

Lots of data collection

Issues:

No major issue today

Beam Downtime

During last night, apparently the photon beam was down in all SASE beamlines during two longer periods:

• between 2:48am and 3h23am (35 min) on 14.4.2025
• between 5:09am and 6h59am (1 hour 50 min) on 14.4.2025

Staff: PV, TS, JK, FK, + users

X-ray delivery:

20 keV, ~ 300-400 uJ, 250 pulses, stable delivery 

Optical Laser:

1030 nm, 850 fs, stable delivery

Achievements / Observations:

Lots of data collection

Issues:

No major issue today

X-ray delivery:

20 keV, ~ 500 uJ, 246 pulses, stable delivery

Optical Laser:

1030 nm, 850 fs, stable delivery

Achievements / Observations:

Lots of data collection

Issues:

Shimadzu camera for Schlieren imaging had issue with shutter, mechanically broken.

X-ray delivery:

20 keV, ~ 400 uJ, 246 pulses, stable delivery

Optical Laser:

1030 nm, 850 fs, stable delivery

Achievements / Observations:

Spatial and temporal alignment of optical laser setup
Data collection

X-ray delivery:

20 keV, ~ 400 uJ, 128 pulses, stable delivery 

Optical Laser:

1030 nm, 850 fs, stable delivery

Achievements / Observations:

Rough timing alignment of optical laser setup
Took some initial data 

Issues:

No major issue to report

X-ray delivery:

20 keV, ~ 400 uJ, 128 pulses, stable delivery 

Optical Laser:

1030 nm, 850 fs, stable delivery

Achievements / Observations:

20 keV beam to sample position and cameras
Rough alignment of optical setup
 

Issues:

Optical laser from light conversion had issue with shutter control

SASE3 Apple-X undulator cell 26 issue - SOLVED

During the night, an issue appeared with the SASE3 undulator cell 26 (2nd last Apple-X undulator).
This cell could not be operated and was in status open.
BKR therefore couldn't tune for linear vertical polarization as required by the SASE3 users at SXP.
A ZZ access was discussed and prepared with the experts from the undulator group.

However, they now found a way to repair the issue from remote without access (info from Mikhail Yakopov / undulator group at 10h20).
The issue is solved.

PRC will contact PES spectrometer experts at XPD to tune polarization monitoring with BKR.

SASE1 XTD2 attenuator arm issue

On monday 7.4.2025, one of the SASE1 attenuator arms (SA1_XTD2_ATT/PNACT/A9) with a 2mm Silicon attenuator got stuck when inserted
EEE reports in the XO meeting today that DOC / EEE helped to unblock and remove it from the beam
(from the karabo-history, I assume this was on monday between 10h00 and 10h30).
This arm A9 is now blocked/disabled with the attenuator out of beam to prevent this to happen again until this issue is fixed.
To fix the issue for good and to re-enable operation of arm A9, an access to the tunnel XTD2 would be needed.
The group in charge of this beamline component is XRO. So far there is no access request.
CTRL (Wajid) reminds that also the karabo device needs to be blocked / unblocked.

This week, SPB/SFX receive SASE1 beam.
SPB/SFX (Chan Kim and Tomas Popelar) confirm that they can work this week without this attenuator arm,
in particular because they have their own attenuators and will not use the XTD2 attenuators.
Thus, for operations it seems that this access could wait at least until next week tuesday.

SASE1 pulse energy drops slowly three times

SASE1 XGM detects three times during the morning some slow drop in puls energies from the SASE1 undulator.
The machine cannot find any correlation with any electron diagnostics.
The XGM-measured beam position indicates no beam position drift (which could then by gradual clipping explain the loss in pulse energy).