SA2 status, posted by Frederik Wolff-Fabris on 11 Mar 2023, 12:46
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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. |
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SA2 status, posted by Jan Gruenert on 05 May 2023, 16:51
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MID reports an observation that is particular to the operation at the currently high photon energy of 23 keV
MID inserted the XTD6-MID-preabsorber and assumed that it completely stops the beam.
They acquired AGIPD detector images as dark frames but were surprised to still find some weak background signal (not dark). |
SA2 status, posted by Jan Gruenert on 10 Nov 2023, 17:39 
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End of 30 keV study
The machine finished their attemps for 30 keV tuning while using NEPAL injector laser, unfortunately unsuccessful.
They could not obtain lasing, and all the pulse energy shown during the day on the level of about 20 uJ was only background, no lasing (as |
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SA1 status, posted by Jan Gruenert on 04 May 2023, 00:07
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SASE1 status:
First shift switchover this week at 23h from FXE (19.5 keV) to SPB/SFX (12.4 keV) with issues.
No immediate lasing at 12.4 keV with standard procedures / files, then tuneup using FEL imager (CBor) in multibunch. Wrong pointing (far off |
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SA1 status, posted by Naresh Kujala on 22 Aug 2023, 15:52
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SA1 photon beam line status
- CRL1 lenses are in the beam.
- The shutter between XTD2 and XTD9 is closed (The reason is not known) |
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SA1 status, posted by Naresh Kujala on 22 Aug 2023, 15:56
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SA1 photon beam line status
- CRL1 lenses are in the beam.
- The shutter between XTD2 and XTD9 is closed (The reason is not known) |
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SA1 status, posted by Jan Gruenert on 19 Sep 2023, 18:58
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Concerning SASE1:
Please note that for this week the "remote power limit" was set to 5 Watt in order to protect CRL1.
The photon energies this week are 5.5 keV (FXE, day) and up to 7keV (SPB/SFX, night). |
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SA1 status, posted by Jan Gruenert on 21 Sep 2023, 09:24
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Info by R.Kammering (mail 20.9.23 18h25), related to the SA1 intensity drops during large wavelength scans:
"We found some problematic part in the code of our wavelength control server.
After lengthy debugging session we (Lars F, Olaf H. and me) did find a workaround which seems to have fixed the problem. |
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SA1 status, posted by Jan Gruenert on 22 Sep 2023, 00:56
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As agreed beforehand, PRC and SPB/SFX re-assessed the SA1 EPS power limit based on actual performance, required number of pulses and rep rate, at the
agreed SPB photon energy of 7 keV.
The actual lasing performance is on average 1.3 mJ / pulse at the current 7 keV. |
Re: Shift summary, posted by Giuseppe Mercurio on 05 May 2023, 07:23
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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.
Giuseppe |
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Pulse energy has dropped to ~50% from this morning, posted by Thomas Preston on 03 Jun 2023, 13:42
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03 Jun 2023, 13:46
We called the BKR to ask what they can do about our pulse energy being 50% (~160uJ and slowly dropping) of what it was since we made our hutch
intervention (with 0 bunches). BKR were asked to organise a time slot with PRC and the other instruments to make an intervention to try to increase our |
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Noght shift sammary 18.08.2023, posted by Sergii, Manuel on 19 Aug 2023, 07:16
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Night shift summary on 18.03.2023
Finished XAS series at 1.5 mJ/mm² for different delays
Performed XAS at 6 mJ/mm²
Tested tr-RIXS signal
at 1mj/mm² with 29 different delays, signal too weak to continue
Took 5 hours of tr-RIXS signal at 1.2 mj/mm² with 29 different delays
Problems: |
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Night shift summary, 23.10.2023, posted by Laurent Mercadier on 23 Oct 2023, 06:46
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Night shift summary on 16.08.23, posted by Sergii Parchenko, Manuel Harder on 17 Aug 2023, 11:09
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Achievements
Acquired tr-RIXS data with 4.0 mJ/cm² laser power for 21 delays between -2 and +10 ps at 853 eV. including static XAS and dark hRIXS
runs. Totally collected 210 minutes of data i.e. 10 minutes per delay
Acquired tr-RIXS data with 4.0 mJ/cm² laser power for 21 delays between |
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Night shift summary 30.07.2023, posted by Sergii, Martin on 31 Jul 2023, 01:42
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Achivements:
-We measured vertical spot size for several VFM settings
Problems: |
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Night shift summary 21.10.2023, posted by Laurent, Phuong on 21 Oct 2023, 06:30
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Night shift summary 21.10.2023
Achievements
Found T0 on SiN, but the response is very slow (~10 ps).
Azimuth (phi) scan
Start of theta scan with optimized
phi
Problems |
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Night shift summary 20-21.04.2023, posted by Robert Carley on 21 Apr 2023, 04:13
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Activities:
Investigated SAXS scattering instability and found it to come from the pointing variation of the PPL
Recorded microscope images
of the PPL spot of the pBN to quantify the pointing for different spot sizes
Enlarged the beam and measured pumped SAXS. Results seem better |
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Night shift summary 05.01.2023, posted by Teguh, Luigi on 06 Mar 2023, 06:20
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Achievements:
1. Continued measuring time-resolved and static RIXS on water (run table in elog entry #103)
2. Periodically checked spatial overlap and BAM compensator in-between measurements. |
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Night shift summary 02.04.2023, posted by Loic, Yi-Ping on 03 Apr 2023, 06:38
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Achievements:
Collected more scans on cyanocobalamin, both delays scans and dynamic XAS
Issues with bad signal in beginning but good signal in the last hours |
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Night shift summary 02.03.2023, posted by Teguh, Luigi on 02 Mar 2023, 05:41
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Achievements:
1. Performed knife-edge scan. The beam size is currently at 5 um x 120 um.
2. Aligned the spectrometer at O K edge (2.8 pixel FWHM, 110 meV resolution, 4800 resolving power) |