Issue, posted by Jan Gruenert on 10 Apr 2023, 02:25
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REPAIRED / FIXED
Problem: The imager SPB_XTD9_IMGPII45 insertion motor lost steps and kept the machine to maximum 2 bunches per train.
Mitigation by DOC/EEE/PRC on 8 April 2023: made sure that screen seems actually out of beam and took imager out of interlock |
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Issue, posted by Andreas Koch on 13 Apr 2023, 15:29
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Trigger issue with SXP_XTD10_IMGES - Exit Slit imager
The external trigger of the Navitar camera was not set, fixed now.
The single pulse trigger of the imager: MCP + camera is tested and correctly working. |
Issue, posted by Laurent Mercadier on 19 Apr 2023, 17:51 
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We report on an issue regarding the bunch pattern: The bunch pattern read by SCS_RR_UTC/MDL/BUNCH_DECODER shows 48 pulses, but we instead use 50 pulses.
Currently, we have a separate RF window and our 1st pulse Id is 2604. We operate at 2.2 MHz, and as required, 50 pulses. See attachment 1.
This means that the last two pulse Ids are 2700 and 2702. However, these values exceed the number of pulses allowed, and the way the bunch pattern |
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Issue, posted by Naresh Kujala on 28 Apr 2023, 11:21
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Issue with SA1_XTD9_PBLM and it is stuck.
Hi All,
After discussion with SPB, they will slightly move the PBLM screen where they don't see any distortion in the beam and are willing to continue |
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Issue, posted by Naresh Kujala on 28 Apr 2023, 13:00
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- Received a call from machine RC (Sergey Tomin)
- There is an issue with DOOCS to Karabo bridge, Tim and DESY experts are looking into this and came to the conclusion that it can't be resolved
now and need more time something like 1 week. (probably next week). Due to this PySpectrometer for SA3 is not available, as SQS would like to set up a |
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Issue, posted by Tokushi Sato on 05 May 2023, 00:50
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| Laser synchronization is gone, unlocked from 04.05.2023, 22.47. E-mail was sent to lbsync-expert@desy.de and c.c. to las-op@xfel.eu. |
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Issue, posted by Tommaso Mazza on 14 May 2023, 05:33
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SA3 GATT has trouble in setting the pressure at ~0.5mbar. setting any value between 0.5 and 0.6 will have it settle around 0.48.
It turns out the GATT cannot tune the pressure between 0.48 and 0.62mbar. tuning pressure continuously to keep transmission constant gets us
in the need of that range eventually. the problem is that at 0.48mbar the valve V30740S is at 100%. the minimum opening of the next valve V307030S gets |
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Issue, posted by Naresh Kujala on 31 May 2023, 17:35
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HED reported that they are unable to go 352 pulses and while changing/dailing the no. of pulses in the bunch Pattern it is showing the EPS is
limited to 300 pulses. It seems on the SA2_MAIN scene the link for bunch Pattern apparently using the macros scene, which is preventing it from going |
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Issue, posted by Tommaso Mazza on 05 Jun 2023, 06:45
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around 6:15, the lights as the one shown in the attachment turned on by themselves in the control hutch. after some minutes, they switched off.
from the exp hutch camera, we realized that this happened in there as well, which impacted negatively on the running measurement. The pnCCD is
sensitive to ambient light and we have to keep the hutch dark while measuring. |
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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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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, 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 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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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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Issue, posted by Michaela Petrich on 16 Jun 2023, 06:28
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staus of JUN16, 11:30
SA1 and SA3 have been adjusted to acceptable conditions to be compatible with simultaneus operation at SA2
tuning on SA2 is ongoing |
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Issue, posted by Harald Sinn on 29 Jul 2023, 17:57
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The hutch search of SASE3, SXP became defective around 5am.
DESY MPS group replaced a defective warning light unit and now it seems ok. |
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Issue, posted by Raśl Villanueva-Guerrero on 10 Aug 2023, 22:43
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Here is a capture of the observed issue with the SPB shutter the past night.
Observe the two opening/closing incidents: the first kept the shutter "OPEN" signal during 4 minutes aprox., and the second did |
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Issue, posted by Romain Letrun on 12 Aug 2023, 07:19
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| Potentially damaged 1.2 mm CVD in XTD2 attenuator. This feature was not present earlier in the week. |
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Issue, posted by Chan Kim on 15 Sep 2023, 14:54
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Vacuum issue at XTD2 tunnel which might be triggered by SA1_XTD2_ATT Arm5 (1.2mm thick CVD diamond)
It happened once again at around 3pm. |
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Issue, posted by Yifeng Jiang on 18 Sep 2023, 19:14
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We found that the x-ray pulse energy dropped a lot when we changed the undulator from 5.5 keV to 5.45 keV. We called BKR to optimise it (attachment
1)
=> There is a problem with the phase shifter of the undulator. It stacks sometime. If the x-ray intensity drops, we need to ask BKR to optimise |