Shift summary Feb 11th, posted by Jörg Hallmann on 12 Feb 2023, 01:56
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intense data taking on various samples
2 main issues:
- data collection using the optimize macro is too fast for the system and calibration and the data transfer from SDD to HDD is slower than collecting |
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End of Shift, posted by Trey Guest on 16 Feb 2023, 23:01
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Staff: KK, RB, TG, AS, CK
X-ray delivery
9.3 keV, 1-120 pulses,
Optical laser delivery |
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shift summary, posted by Jan-Etienne Pudell on 21 Feb 2023, 23:07
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- Tunnel + experimental hutch alignment (Mirrors, CRL1 and CRL2)
- Aligned main devices: Optics Peter, x-ray eye, EPIX and Zyla and pin holes.
- Tried some alignment of the NFL (1D) lenses with pin hole and not pre focussed beam. We found a lot of scattering from pinholes which dominates |
SASE1 changing photon energy changes the 2-color setup in SASE3, posted by Thomas Baumann on 21 Feb 2023, 23:31 
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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. |
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shift summary, posted by Jan-Etienne Pudell on 23 Feb 2023, 01:51
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After realignement of M1 and M2 we could solve the problem of the elogated beamprofile. Different lens setting were prealignd for the use in combination
with the NFL.
We took data for several 1D diamond lenses together with a Vycor sample to extract the beamsize from the specles. |
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shift summary, posted by Jan-Etienne Pudell on 24 Feb 2023, 00:55
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We tested pulse on demand scans with scantool and confirmed that there is only one shot per scan point. This was used to print the footprint in
a LIf crystal.
We took caustic scans for 1D diamond lenses using a wire and using specles to extract the beamsize. |
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Shift summary, posted by Alexey Zozulya on 24 Feb 2023, 22:57
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- Measured the speckle patterns using EPIX detector to estimate the beamsize focused down by 1D lens (Row 13).
- Heat load test to NFL #18 with 50 bunches.
- Measured the speckle patterns with 2D focusing lens to estimate the beamsize. wire edge scan? |
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shift summary, posted by Johannes Moeller on 15 Mar 2023, 01:50
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HXRSS delivery, 600 - 700 uJ, 1 bunch, 8.991 keV. Pedestal visibly in HIREX, not checked with MID spectrometer yet.
beamline aligned
and beam brought to popin imager
struggle with jet pumping, to be continued
beam brought into experimental hutch, first rough alignment
of reference samples and cameras
Epix flight path leaked and window re-glued
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End of shift, posted by Johannes Moeller on 16 Mar 2023, 01:35
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Stable HXRSS delivery with >800 uJ, 1 bunch, 8.99 keV.
Re- Alignment of X-ray beam performed.
-Beam position defined for sample interaction in SAM CAM1. Do not touch SAM CAM1 |
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shift summary, posted by Johannes Moeller on 18 Mar 2023, 01:45
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stable HXRSS delivery at 8.99 keV, 1 bunch. XGM intensity during the day decreased from 750 uJ to 600 uJ.
Vacuum in sample chamber
stabilized with cold trap and full beam path opened to AGIPD and endstation
Again problems with smaract stages in DES, but imager in a good
position to continue.
First scattering data recored from water jet. Unknown, bimodal intensity distribution
Focus characterization |
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shift summary, posted by Johannes Moeller on 19 Mar 2023, 02:01
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upper and lower branch of SDL aligned
beamsizes and angular mismatch characterized
vacuum leak of flight
path fixed
side view microscope re-aligned
problems with replaced MPC diamond detector. issue with in-vacuum cabeling suspected
misconfigured
timing of AGIPD fixed
splitting ratio of SDL detuned while HXRSS intensity decreased significantly. Possibly correlated.
With |
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Finding t0 with the PAM, posted by Terry Mullins on 21 Mar 2023, 19:35 7x
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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 |
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XTD2 Si500 attenuator broken, posted by Johan Bielecki on 04 Apr 2023, 11:18
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Attachment 1: Beam in SPB hutch with Si500
Attachment 2: Beam without Si500 |
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Shift summary , posted by Wonhyuk Jo on 19 Apr 2023, 02:14
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Achieved
Brought the X-ray to the end of the beamline.
Aligned the goneometer with a pin.
Found the timing of
AGIPD at the detector distance of about 3.4 m from the sample.
Found the timing of Jungfrau detector in burst mode.
Measured the |
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Shift summary, posted by Wonhyuk Jo on 20 Apr 2023, 02:26
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Achieved
Brought the 800 nm of optical pump laser to the hutch after the intervention.
Found the rough spatial and temporal overlap
between the X-ray and pump laser with MID X-ray eye.
Found the sufficient photo-induced effect on the user sample (HfN) with one unpumped |
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Shift summary, posted by Wonhyuk Jo on 21 Apr 2023, 02:10
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Shift Summary
Collected optical laser-induced dynamics in HfN and STO/SRO samples.
Jungfrau detector transferred data without data dropping issue.
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shift summary, posted by Ulrike Boesenberg on 24 Apr 2023, 02:45
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Beam came back quickly after cryo-incident with ok seeding performance (not very stable).
Finish 3381-Pudell beamtime with
SRO/STO samples at time delays and laser fluences.
Decided not to scan the HXRSS energy but stay at current position
Mount samples |
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pointing stability, posted by Tommaso Mazza on 02 Jun 2023, 06:17
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we lost spatial overlap on several instances.
It seems that this happens when SASE2 changes number of pulses.
when we have SASE2 changing number of pulses, spatial overlap is lost and this goes with a change in the position read by the xgm in the order |
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Taking the beam , posted by Abhisakh Sarma on 13 Jun 2023, 06:49
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BKR changed the beam energy from 15 keV to 12.4 keV
Energy 12.4 keV
Repeatation rate 1.1 MHz |
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Vacuum Leak in SA2-XTD1 Solid Attenuator - [SOLVED] - Closing report , posted by Raúl Villanueva-Guerrero on 13 Jun 2023, 11:23
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Dear all,
the closing report on this issue can be found in the following Alfresco link:
https://docs.xfel.eu/share/s/GzxORQOGToe_tiug7LIHhQ |