Preparation of an end or input test mass (ETM/ITM) (Hydroxide-Catalysis Bonding of ears)

Document #:

LIGO-E1000278-v2

Document type:

E - Engineering documents

Abstract:

This document goes through the procedure for preparing an ETM/ITM test mass (D080658-v3 and D080657-v3) for monolithic installation into the quadruple suspension structure. The procedure consists of hydroxide catalysis bonding on a fused silica ‘ear’ (suspension element according to D080751-v1) to each of the surfaces S3 and S4 in a well-defined location and re-storing the mass. General hydroxide-catalysis bonding procedures are detailed in E050228. The procedure assumes the mirror substrate has been fully prepared with HR and AR coatings applied to respectively the front and the back surface of the substrate. It includes mirror handling with the ergo-arm during these procedures. Mirror handling procedures with the ergo-arm are detailed in T1000082.

Files in Document:

• E1000278-v2 - Preparation of an end or input test mass...pdf (147.1 kB)

Other Files:

• E1000278 - Preparation of an end or input test mass (E...doc (676.5 kB)

Topics:

• Suspensions
• Final Design

Authors:

• Margot Hennig
• Marielle van Veggel
• Russell Jones
• Karen Haughian
• Liam Cunningham
• Nicola Beveridge

Keywords:

aLIGO suspensions quadrupole suspension monolithic suspension ETM/ITM hydroxide catalysis bonding

Notes and Changes:

* Some minor changes to the document:
* Grade of solvent used has been changed from reagent grade to spectroscopic grade.
* Added a note not to get methanol near the AR and HR coated surface that are protected with first contact.

Related Documents:

• LIGO-D080657: aLIGO, COC Input Test Mass (ITM) Substrate (D080657 ALIGO COC ITM SUBSTRATE)
• LIGO-D080658: aLIGO, COC End Test Mass (ETM) Substrate (D080658_ALIGO COC_ETM_SUBSTRATE)