georgia.mansell@LIGO.ORG - posted 16:47, Wednesday 31 October 2018 - last comment - 08:39, Friday 09 November 2018(44950)
HAM3 QPD SLED path photos
Sheila and I took a peek through a viewport into HAM3 to look for damage to a beam dump on the POP path, and to look for anything fishy (excess scattered light etc) (WP 7896). The best view we had was unfortunately looking at the back face of the beam dump but we did not see anything untoward.
The beam dump in question is blocking a beam which is picked off the POP QPD path, between AROM-RH6 and AROM-RH7 in this diagram. The viewport we were looking through is up above the QPD SLED in that diagram. We didn't get a good photo of this particular beam dump.
I'm attaching the only decent photos we took, of the beam dumps on the QPD SLED. The beam dump on the QPDB diode reflection looked a bit cloudy.
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Here're some pictures of HAM3 during the Sept 2017-Feb 2018 vent that show this beam dump. It's a full V of black glass, not just one plate. This supplements the SolidWorks rendering of the camera view found in G1802144.
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