Shift summary, posted by Ulrike Boesenberg on 12 Jun 2023, 02:01
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*Some more tuning of HXRSS and focus optimization in the morning.
*XPCS data taken in WAXS geometry on different glass samples. |
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late shift summary, posted by Laurent Mercadier on 12 Jun 2023, 01:06
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Achievements
Optimized THz EOS, managed to observe single shot EOS trace with good SNR
Characterized chirp with different glass lengths
Ran
SiN spectral encoding in parallel
Issues |
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Early shift summary, posted by Robert Carley on 11 Jun 2023, 17:34
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Achievements
Observed first EOS of THz emitted from FEL-pumped STE on SiC and Si membranes
Explored fluence dependence and damage limits
Explored
sample heating with pulse repetition rate
Measure timing jitter of FEL with and without longitudinal feedbacks engaged
Problems |
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Night shift summary , posted by Robert Carley on 11 Jun 2023, 07:40
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achievements
optimized EOS signal from FEL-induced THz emission from STE on Sa of PAM
reduced chirp to increase timing sensitivity to 9fs
/ pixel of PAM
STE-based PAM measurements at fixed delay and delay scans.
after FEL down at 6am, continue with PAM measurements |
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Shift summary, posted by Chan Kim on 11 Jun 2023, 07:28
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X-ray delivery
12.42 keV, 0.65 mJ/pulse, low pulse energy but mostly stable delivery
Optical laser delivery
none
Achievements/Observations |
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Shift summary, posted by Ulrike Boesenberg on 11 Jun 2023, 02:08
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* First half of the day was used to optimize seeding performance
* Cryo issues started at 6 pm; were resolved by 9:30pm
* After some tuning, we observed very nice seeding performance around midnight (ratio better than 1:1) |
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late shift summary, posted by Loic Le Guyader on 10 Jun 2023, 23:24
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achievements
checked coarse timing between FEL and PPL at XOX. It had shifted significantly
determined that light coming out of sapphire
from FEL was not heating but fluorescence
observed for the first time THz emission from STE from FEL pump on sapphire substrate and mesured |
Status, posted by Jan Gruenert on 10 Jun 2023, 21:52 
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The Cryo team solved the problems, beam is back.
Downtime from 17h59 until 21h03. |
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Issue, posted by Jan Gruenert on 10 Jun 2023, 18:46
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18h05 : RC informs:
Machine is down, because Cryo-OK was lost.
Apparently it is a turbine but not the cold compressors. |
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Shift summary, posted by Chan Kim on 10 Jun 2023, 06:55
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X-ray delivery
12.42 keV, 0.8 mJ/pulse, stable delivery
Optical laser delivery
none
Achievements/Observations |
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Shift summary, posted by Ulrike Boesenberg on 10 Jun 2023, 00:39
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* Data collection of vycor and glass samples in SAXS geometry until 9am
* Successful intervention on SA2_XTD1_ATT arm 6 by the vacuum group, see elog entry 237 by Raoul and Bianca . Thanks!
* Simultaneous CoC in the MID hutch to WAXS geometry. |
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late shift summary, posted by Loic Le Guyader on 09 Jun 2023, 22:52
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achievements
try pumping STE membrane with FEL and detect THz emission with single shot EOS. No success.
tried cross-polarization for a
short time, no success either.
reduced the PPL chirp to record single shot transient reflectivity data versus BAM for the night.
issues |
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Vacuum Leak in SA2-XTD1 Solid Attenuator - [SOLVED] - Preliminary report, posted by Raśl Villanueva-Guerrero on 09 Jun 2023, 15:41
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Dear all,
After the incidences reported yesterday and the diagnostic remotely done (where we could narrow down the root cause to the edge-welded below
at the Linear stage of the arm Nr. 6 - 2.4 mm CVD diamond], we confirmed this as a fact during the schedule access today. Here is a succint summary of |
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Issue, posted by Jan Gruenert on 09 Jun 2023, 12:37
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Repair of SA2_XTD1_ATT
Status 12h30:
The current MID users took beam until 9am, only then the machine could start preparing for the tunnel access e.g. by decoupling the South branch, |
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Shift summary, posted by Adam Round on 09 Jun 2023, 07:05
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Staff: DZ, AR, MK
X-ray delivery
12.42 keV 169 pulses for alignment 16 pulses for data collection. stable delivery excluding the extended interuption
Optical |
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Shift summary, posted by Ulrike Boesenberg on 09 Jun 2023, 02:22
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*Vacuum issues: There seems to be a leak in the arm nr. 6 (2.4mm CVD Diamond). This has escalated to trip several times the vacuum sector interlock.
VAC will do an intervention to XTD1 with broken interlock tomorrow morning starting 9am to remove arm 6 permanently and putting a blind flange instead.
*We can measure for today with the 2.4mm CVD Diamond inserted into the beam. |
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Issue, posted by Jan Gruenert on 08 Jun 2023, 17:05
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SA2_XTD1_ATT solid attenuator vacuum issue
Info from VAC (Raul Villanueva) 12h30:
It seems to be a leak in the arm nr. 6 (2.4mm CVD Diamond). This has escalated to trip several times the vacuum sector interlock.
On top of that, we also discover an issue with the configuration of a ion pump controller that have required the intervention of DOC / EEE. |
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Issue, posted by Johannes Moeller on 08 Jun 2023, 11:02
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Addition to previous issue:
Last incident (of overall 4), we had 0 bunches, moved in XTD1 ATT 0.6 and 1.2 mm CVD diamond in and 2.4mm CVD out. However, vacuum started to
become bad already two days ago. |
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Issue, posted by Jan Gruenert on 08 Jun 2023, 10:37
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SASE2 vacuum incident
7h10 : MID informs PRC about a vacuum incident in the SASE2 tunnel which tripped the beam. Instructed to contact
directly VAC-OCD
8h26 : VAC-OCD informs that investigation is ongoing, but beam can be delivered. This kind of trip usually occured rarely |
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Late shift summary, posted by Loic Le Guyader on 07 Jun 2023, 23:54
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achievements
setup spectral encoding of the transient reflectivity in FFT
determine coarse timing in the XOX
fixed BOZ_Z motion
and DSSC silicon oil pressure reading
problems |