HED summary 25.3., posted by Lisa Randolph on 25 Mar 2023, 21:01
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This day we had lots of issues.
Nightshift noticed that the mirror 2 feedback was not running anymore since about 22hrs; PBLM2 cam was unknown; powercycling recovered
the camera, feedback operational again.
Continued shooting until ~9:00
At ~9:30 the whole Karabo, online cluster were dead. No control |
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Shift end, posted by Jayanath Koliyadu on 24 Mar 2023, 23:14
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X-ray delivery
1-165 pulses, 1.1 MHz - 28.2 kHz, upto 350 uJ @ 50 pC
Optical laser delivery
ns laser for imaging
Achievements/Observations |
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HED shift summary 23.-24.3., posted by Lisa Randolph on 24 Mar 2023, 21:46
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8.2 keV, 1-2 bunches, 600uJ
23.3.
did timing runs and optimized the beamline alignment
Karabo was working very slow
continued with sample alignment
performed |
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Status, posted by Naresh Kujala on 24 Mar 2023, 19:42
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Reply to elog103:
Spoke with Machine RC Thomas Wamsat and SQS.
Machine RC has some ideas to try. SQS have agreed that they can give 30 min for the machine to optimize the intensity. |
Stability Issue, posted by Tommaso Mazza on 24 Mar 2023, 18:27 
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the pulse energy in XTD10 is lowered by ~30% when SASE1 changes photon energy, compare att. 1 and 2.
In addition, the intra-train pulse energy stability gets much lower. Potentially, there is an impact on the pointing as well, which is critical
for the pump-probe experiment. |
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Shift end, posted by Jayanath Koliyadu on 23 Mar 2023, 23:24
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X-ray delivery
1-165 pulses, 1.1 MHz - 28.2 kHz, upto 400 uJ @ 50 pC
Optical laser delivery
ns laser for imaging
Achievements/Observations |
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Status, posted by Romain Letrun on 23 Mar 2023, 14:31
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After SASE1 HIREX GOTTHARD reconfiguration, we now get a single pulse per frame. This was verified by comparing data from HIREX recorded with 564 kHz
and 1.13 MHz X-ray repetition rates. Both intensity and number of peaks is comparable for the two repetition rates. |
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Status, posted by Naresh Kujala on 23 Mar 2023, 13:07
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Update for elog 99:
Now Gotthard timing is changed to new setting for 0.5 MHz.
attached screenshot with gothard timing setting |
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Issue, posted by Romain Letrun on 23 Mar 2023, 11:38
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When using 1.13 MHz X-ray repetition rate, SASE1 HIREX is capturing two pulses in a single frame giving the impression that there are more peaks within
the spectrum than there are in reality.
This was verified by recording data with one and two pulses per train, which are shown in attachment. |
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Shift summary - night shift, posted by JP, Hauke, Samuele on 23 Mar 2023, 00:27 7x
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22 Mar 2023, 23:30 Handover from late shift
Tasks for the night:
source point measurement
Sample alignment
timing
23 Mar 2023, 00:39 Source point measurement |
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HED shift summary 22.03., posted by Lisa Randolph on 22 Mar 2023, 23:57
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During the night we worked on the temporal overlap between Relax laser and XFEL.
In the morning we noticed that the beam jitter is quite large (in and out of the aperture of the CRL4 lenses). There seems to be a correlation
with the HED popin. We adjusted the TCC with x-ray and laser. Performed transmission scans. |
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HED shift summary 22.03., posted by Lisa Randolph on 22 Mar 2023, 23:57
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During the night we worked on the temporal overlap between Relax laser and XFEL.
In the morning we noticed that the beam jitter is quite large (in and out of the aperture of the CRL4 lenses). There seems to be a correlation
with the HED popin. We adjusted the TCC with x-ray and laser. Performed transmission scans. |
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Shift end, posted by Adam Round on 22 Mar 2023, 21:49
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X-ray delivery
9 keV 1 to 165 pulses ~ 300 mj per pulse - stable delivery during the day
Optical laser delivery
ns lasers for illumination only
Achievements/Observations |
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Late shift summary, posted by Konstantin / Lisa / Carsten / Rahul / Toma / Masruri on 22 Mar 2023, 17:07 7x
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22 Mar 2023, 17:08 started the log, the aim for the shift is the alignment of the sample and source point measurement. In addition to that, we also plan
to check the Greateyes camera.
22 Mar 2023, 17:53 continuing the sample alignment |
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HED Summary 21.3., posted by Lisa Randolph on 21 Mar 2023, 23:39
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Got the beam, aligned it up to the TCC, mirrors in 3 mrad configuration, checked positions for the CRLs. Energy up to 500 uJ at 8.2 keV, 2
bunches.
Feedback M2 PBLM-2 camera was UNKNOWN. Power cycle (just switch off >> on) solved the issue. Also, the screen was extracted. Insert the screen. |
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Shift end, posted by Jayanath Koliyadu on 21 Mar 2023, 23:36
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Staff: JB, PV, TS, RL, RdW, JK, AR
X-ray delivery
1-165 pulses, 1.1 MHz, upto 400 uJ @ 50 pC
Optical laser delivery |
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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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Late shift summary 19.03.23, posted by Robert Carley on 20 Mar 2023, 01:24
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Activities:
Measured tr-RIXS spectra on user sample in silane solvent
Problems:
Sometimes the PPL shutter cannot be opened from the control room after searching the hutch.
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moning shift summary, posted by Nahid, Ben on 19 Mar 2023, 15:03
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Achievements:
measured the new sample, Silane, with different time delays
Problems
Tuning of SASE2 led to a 50% decrease in the SCS XGM intensity without affecting the SASE3 intensity. It also caused a jump in the BAM |
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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 |