Shift summary, posted by Jörg Hallmann on 10 Aug 2024, 01:17
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Found the delay time from upper and lower branches of SDL with a frosted-YAG.
The upper branch is -512.8 and the lower branch is -513.28.
The delay time difference is about 500 fs. |
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Shift summary, posted by Wonhyuk Jo on 11 Aug 2024, 02:15
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Found the spatial overlap on the Suna microscope with Zyla.
Found the SDL motor position giving 200 fs time difference between the upper and lower branches.
The encoder and current values of DC2_CASZ and DC1_CASZ are not 100 % correlated. |
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Shift summary, posted by Wonhyuk Jo on 12 Aug 2024, 02:07
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Found spatial overlap at Suna microscope with Zyla cam.
The splitting ratio was obtained about 1:1.
The spatial jittering from upper and lower branch were investigated. |
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Shift summary, posted by Wonhyuk Jo on 13 Aug 2024, 02:04
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Found the interference fringe at Suna microscope with Zyla cam from MID split-and-delay line.
The fringe patterns were recorded as a function of delay controlled by the upper branch motor position.
Obtained the interference fringe patterns with two pulses with different repetition rate of machine. |
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Shift summary, posted by Wonhyuk Jo on 13 Sep 2024, 02:16
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- DAQ was crashed after taking darks of AGIPD. It was solved by DOC and OCD.
- Laser could not switched from optical to RF lock. Solved by OCD (using doocs).
- Energy scan was attempted, which was not successful. |
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Shift summary, posted by Wonhyuk Jo on 14 Sep 2024, 02:23
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- The seeding optimization result: Total 450 uJ (Seeding of 150 uJ + SASE of 300 uJ). BKR will be able to start optimization on Saturday
around noon if necessary.
- The pump-probe (PP laser and PuMa pulse) experiment data on the substrate peak was collected. |
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Shift summary, posted by Wonhyuk Jo on 15 Sep 2024, 02:16
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- The seeding optimization is ongoing, which was not successful. Now we have a total of 170 uJ including SASE and seeding.
- The option to switch to SASE is relatively not complex and can be done with the support of BKR without a seeding expert. BKR expects to
provide about (more than) 1 mJ. To be discussed with user later. |
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Shift summary, posted by Wonhyuk Jo on 16 Sep 2024, 02:21
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- Pump-probe experiments are being conducted using PuMa and PP laser.
- The user program is ongoing over the night.
Tomorrow, |
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Shift summary, posted by Jörg Hallmann on 26 Sep 2024, 01:46
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Started the day with vacuum & detector issues
real start of the experiments only at about 6 p.m.
measurement of a selection of samples (urea, ludox) using the levitation device |
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Shift summary, posted by Jörg Hallmann on 27 Sep 2024, 01:51
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started initial alignment for the ptycho experiment
Continued with XPCS measurement using the levitation device
issues: contribution of the 2nd harmonic of 8 keV at 16 keV visible on the Jungfrau detector - surpressing via mirror alignment not successful |
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Shift summary, posted by Jörg Hallmann on 28 Sep 2024, 01:31
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started with data acquisition for the ptycho experiment with different geometries
started with XPCS measurements of capillaries using the FSSS |
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Shift summary, posted by Jörg Hallmann on 28 Sep 2024, 23:42
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continued with the evaluation of the XPCS analysis packages
investigated the effect of alignment optimizations and forced misalignments on the contrast directly with the online XPCS tool
checked additional standard samples |
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Shift summary, posted by Jörg Hallmann on 30 Sep 2024, 01:50
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01:49
Worked on the XPCS analysis packages |
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Shift summary, posted by Ulrike Boesenberg on 31 Oct 2024, 02:43
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12.389keV, HXRSS, 1-400+ bunches, 450uJ
Seeding alignment
Beamline alignment (Mirror + foccussing)
Measured energy and moved it the requested value
Cryos
for sample and monochromator are prepared
Aligned DES spectrometer
Started with DCCM characterization (440)
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Shift summary, posted by Jörg Hallmann on 05 Dec 2024, 00:06
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machine runs at 17 keV with about 1.2 mJ
achievements: |
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Issue, posted by Johannes Moeller on 05 Dec 2024, 09:18
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MID operation limited to 55 bunches by SA2_XTD1_OPTICS_PROTECTION/MDL/ATT1 because of inserted Si 0.5mm. Seems a bit too tight for 1mJ@17keV, since diamond
is not so usefull at this photon energy anymore. |
Stability Issue, posted by Alexey Zozulya on 05 Dec 2024, 19:47 
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Today we have observed multiple large disturbances to beam stability. These can be characterised by large jumps in the horizontal beam position, which
at its extreme amounts to a loss of beam from our behalf. M2 mirror feedbacks are able to return the beam to the initial position after ca. 10 minutes.
Beam jumps have been approximately 1hr apart. We do not observe the beam on the XTD6 tunnel imager in this case, but do observe good lasing quality on |
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Shift summary, posted by Jörg Hallmann on 06 Dec 2024, 02:41
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optimization of the timing of the involved components (laser, cameras, FEL)
generation of the first bubbles in water
issue |
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Stability Issue, posted by Johannes Moeller on 06 Dec 2024, 06:37
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| The jumps keep repeating very frequently since yesterday afternoon. The overall drift of the beam seems to accalerate as well. |
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Stability Issue, posted by Johannes Moeller on 06 Dec 2024, 07:49
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| And since the 4th there are some instabilities in the vacuum levels at M1 and M2 as well. |