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

Actually, it looks like the sync was lost shortly before 23h last night as the jitter went to 0fs and recovered at 1am when a new sync search probably started.

achievements

• with help from LAS OCD, we got the PPL synchronized again with optical lock and close to the initial t0 on the sample
• we found t0 on the sample again
• collected data with magnetic field
• initial setup of damnit/amore for semi-automatized data processing

problems

• no issue besides the initial loss of PPL synchronization

achievements:

- measured delay scans at sample tilted by 20 degree

problems:

- we saw a drop in pulse energy around 00:30 in XGM at SCS, we verified that it was not because of the FEL not going through the HSLITS, in the end after calling BKR it was realized that there was indeed a problem with BC2, after fixing this, beam pointing was recovered and pulse energy as well

- beam pointing instabilities during tuning for SA1 around 6:30

achievements:

- measured delay scans at sample tilted by 20 degree

problems:

- we saw a drop in pulse energy around 00:30 in XGM at SCS, we verified that it was not because of the FEL not going through the HSLITS, in the end after calling BKR it was realized that there was indeed a problem with BC2, after fixing this, beam pointing was recovered and pulse energy as well

- beam pointing instabilities during tuning for SA1 around 6:30

achievements

• finished recording dataset at 20degree
• changed for sample with smaller grains at normal incidence and moved DSSC to 1.2m
• OL induced some change of the sample but the scattering ring remains and then stabilize
• started collecting data

problems

• issue with jupyter notebook slow processing. Asked DOC for 10 additional reserved nodes. Also found issue that 100's of Mb or error messages are saved in the jupyter notebook and found a solution to supress them https://in.xfel.eu/elog/3360+Duerr/92

achievements:

• measured delay scans on 16 nm samples at different magnetic fields (4 runs) before the problem below appeared

problems:

• scroll pump of the FFT degraded, rough vacuum got worse, this led to pump in error state and interlock valves. The scroll pump was replaced, vacuum re-established, but we could not see any signal from the samples, only diffuse scattering. We thought this was due to ice frozen on the samples when the pressure increased. We warmed up the cryostat, verified that the conditions of the samples are fine again, and finally started cooling down again.

achievements

• exchanged He dewar and managed to cool down the sample again after vacuum issue last night
• started collecting additional scattering data with alternating magnetic field on large nanoparticles sample

problems

• no issues

achievements:

- we found optimum hRIXS settings for 1020 eV but moving the detector arm

- we found optimum hRIXS settings for 920 eV but moving the detector arm, and then grating pitch and detect arm

- energy calbibration for 920 eV

problems:

- lost internect connection around 6 am

- PI-MTE3 camera claims an exposure of 30 sec but in reakity it"d more lik r13 sec.

- if FEL intensity goes to 0 i spikes, the jupyter notebook give errors, referring to objecests ofdifferent sie.

plans:

-

# 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

SA3 SCS exit slit: the upper blade was detached from the motor and fall into closed position. Maurizio V. and F. Wolff-Fabris tried to move it out of the beam by placing spacers to hold the blade up.

Bottom blade was moved down with the motors. Currently both motors are disconnected.

*** Update 14.02 10AM:

This morning the exit slit was clipping the beam. Another ZZ by M. Dommach, M. Petrich and F. Wolff-Fabris was done to move up the top blade by a further 8mm. 

After that intervention SCS confirmed to see the beam at the Pop-in and at the experimental hutch.

Data for the Horizontal jitter at the HED Pop-In was observed during beam delivery on cw05 (03-05.Feb) and cw07 (14-16.Feb) (see attached pictures). 

We have a similar base jitter in both periods of beam delivery to HED, ranging from a minimum of 50-60um to around 80-100um in both operational weeks.

The SA2 XTD1 XGM is current offline since Saturday morning.

Yesterday, Friday, it already started to present communication problems ( https://ttfinfo.desy.de/elog/FileEdit?file=/XFELelog/data/2023/10/10.03_a/2023-03-10T19:06:29-00.xml&xsl=/elogbook/xsl/elog-fileform.xsl&mode=edit )  and today it became clear a Hard drive is broken and need to be exchanged.

Theo M. and Fini J. are preparing to enter tunnel around 13:00. PRC has informed BKR, RC and HXRSS team. We do not expect to have the problem fixed until the end of the Saturday.

In parallel, beam permission to South Branch was removed due to the lack of communication to the XGM. PRC suggested RCs to disable the corresponding Big Brother rule in order to keep beam permission to proceed with few activities until the ZZ takes place, what was done by machine RPO.

*** Update 14:50:

The ZZ was successful and the colleagues managed to exchange the hard drive and reinstall the software. The XGM shall be working again but it will be monitored in the coming hours.

Special thanks to Theo M., Fini J., Soeren G. and Dey-IT colleagues for the precious volunteer work on Saturday.

TUE 08:30AM:

The SA3 Cell 17 & 18 Phase shifters do not move and encoders are damaged. A ZZ is needed to exchange the encoders. Instruments are informed and access will take place Tuesday morning. Machine has separated the north branch.

*** Update 10:20AM:

ZZ is finished; beam in North Branch to restart soon.

The SA3 EPS power limit at the Big brother was disabled to allow photon energy scans in SQS (due to Kr resonance at XGM, invalid power values are generated and then beam is blocked);

Action was performed by Lars F. (RC), Michaela Petrich (PRC) and F. Wolff-Fabris (XO) with Accelerator RPO.

It will be activated again on Monday 15.05.

**Update 15.05: the above mentioned rule is activated again at 08:10AM.

Photon Activities by XPD colleagues in SA3 are concluded on Sunday 23.07 at 17:00. The photon commissioning activities are concluded for this week.

The PRC agrees with RCs to handle beam back to BKR for further tuning activities while touching common nobs.

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

User proposal 3273:

• X-ray delivary
  • We use several deliveraly modes:
    • Continous single pulse
    • Continous 30 pulses
    • POD: 1 pulses / 30 pulses
  • All works fine, FXE is sastificed with X-ray delivery
• DA:
  • Few minor issues with offline calibration, DOC helped to solve it
  • Error with LPD. Solve remotlyh thanls to Hazem

In general very good perfomances

• 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

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