LHO Witness plate wafer BSC2 Oct 15, 2013

Document #:

LIGO-T1300875-v1

Document type:

T - Technical notes

Abstract:

History of witness plate:
BSC 2

APR 12, '13 FC cleaning of BS
APR 12, '13 - witness plates set
AOS - steering mirror assy/periscope/baffle aligment, SEI CPS change
APR 24, '13 spool on
APR 27, '13 pump down

OCT 7, '13 1pm vented volume
OCT 8-9, '13 door off, intense AOS elliptical baffle work in chamber over witness plate
OCT 15, '13 Pulled witness plate to send to CIT

This plate looks much dirtier than BSC1 plate T1300874 - but it has also seen ~2 weeks of accumulated in-chamber assembly while the other plate has not.

Files in Document:

Other Files:

• Large Image-T1300875-1.tif (file is not accessible)
• t1300875 021214_1.xlsx (file is not accessible)

Topics:

• System Engineering

Authors:

• Betsy Weaver

Keywords:

contamination control wafer witness plate sample

Notes and Changes:

version 1 includes count on new setup (jan / feb 2014 cit). Large image and excel count data. MP and CiT. (This one was not counted on previous setup.)

Referenced by: