Reports 1-1 of 1 Clear search Modify search
VAC (SR2)
yutaro.enomoto - 19:36 Sunday 17 February 2019 (8120) Print this report
Dirt or scars on the surface of the viewport on SR2 Chamber

I am so sad to report this, but I found multiple patterns as shown in the pictures, which are quite likely to be dirt or scars or combination of them, on the surface of the viewport on SR2 Chamber.
This viewport is for injecting/picking-off green laser for Y and picking off IR beam from SRC.

Last Monday, before vacuum work started, I attached a flange protection for this viewport and am sure there were no such pattern at that time. Today I removed it and found the patterns.
Even though the viewport was protected somehow, this happened. I suspect that so strong force was applied to the protection that the protection itself touched the surface of the viewport.
How can we protect them??? 

Editted at 21:30
Circled the patterns in the pictures

Images attached to this report
Comments to this report:
yutaro.enomoto - 18:14 Monday 18 February 2019 (8126) Print this report

Now I am (80%) sure there are scars on it. See the pictures.

Images attached to this comment
yutaro.enomoto - 20:44 Tuesday 19 February 2019 (8143) Print this report

[Saitoh, Enomoto]

Today we also found finger-print-like dirt on it, where the primary green beam hits. So sad.

Images attached to this comment
Search Help
×

Warning

×