LLO BS Prism Gluing Issue and Resolution

Document #:

LIGO-T1200385-v2

Document type:

T - Technical notes

Abstract:

When the LLO BS was hung, it had a large pitch offset, possibly due to prisms glued in the wrong position. This document describes the efforts to understand the problem and the eventual decision to correct it using trim mass at the IM.

Files in Document:

• T1200385-v2.pdf (2.3 MB)

Other Files:

• T1200385-v2.docx (3.0 MB)

Topics:

• Installation
• Modelling
• Suspensions

Authors:

• Janeen Romie
• Mark Barton
• Norna Robertson

Keywords:

SUS LLO BSFM BS prism gluing

Notes and Changes:

Added plot from model to show that pitch mode appearing in the vertical TF (as observed at LLO) is expected.