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Message ID: 210     Entry time: 26 Nov 2024, 09:47
Author: Andreas Koch 
Group: XPD 
Subject: SA1 status 

Concerning damage of the SA1 FEL imager, Operation-2024 eLog #206

The screen position of the YAG screen - when pressing the screen selection button - has been moved by 1 mm so that the damaged area is out of the field of view, see attached screenshots (damage visible under visible light exposure).
The screenshots show the cross-hair, i.e. its nominal beam position and the circular damaged area at its original position of the screen and the new position.

More information on the damage can be found in the damage report, entry #35:
https://docs.xfel.eu/share/page/site/xfelwp74/document-details?nodeRef=workspace://SpacesStore/fd862f30-c6a3-4a5e-9a65-817cbcebb2d9
Also, there is a comment in ttfinfo: https://ttfinfo.desy.de/XFELelog/show.jsp?dir=/2024/47&pos=2024-11-19T09:39:31

Attachment 1: SA1_FEL_imager_-_damaged_spot_at_YAG_-_original_screen_position.png  580 kB  | Hide | Hide all
SA1_FEL_imager_-_damaged_spot_at_YAG_-_original_screen_position.png
Attachment 2: SA1_FEL_imager_-_damaged_spot_at_YAG_-_new_screen_position.png  571 kB  | Hide | Hide all
SA1_FEL_imager_-_damaged_spot_at_YAG_-_new_screen_position.png
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