aLIGO Chamber Entry & Exit Procedures

Document #:

LIGO-E1201035-v26

Document type:

E - Engineering documents

Abstract:

The scope of this document is to summarize the general steps associated with entering HAM and BSC chambers, cleaning in-chamber items (as required) and then exiting the chambers. In general, these steps should be followed for all incursions subsequent to initial installation e.g. commissioning, final alignment or venting for scheduled maintenance. All top level installation procedures are grouped at LIGO-E1200023: aLIGO Chamber (Top Level) Installation Procedures. For latest information on optic cleaning refer to the following COC DCN, E1300142. The marked up version of the main document or the check-list should be posted to the DCC as part of a chamber vent. For checklist go to page 4 of main pdf and print as required.

NOV 2025: For full details on which GV and FGV to close / open refer to T2500020.

Files in Document:

• E1201035-v26 Chamber Entry and Exit Procedures.pdf (file is not accessible)

Other Files:

• E1201035-v26 Chamber Entry and Exit Procedures.doc (file is not accessible)

Topics:

• Safety
• System Engineering

Authors:

• Calum Torrie
• Dennis Coyne
• GariLynn Billingsley
• Matthew Heintze
• Jodi Fauver
• Kaitlin Gushwa
• Margot Hennig
• Rich Abbott

Keywords:

Safety Documents Policies

Notes and Changes:

Added step to check TCS CO2 alignment to CP on BSC1 and BSC3

Related Documents:

• LIGO-E0900047: LIGO Contamination Control Plan
• LIGO-T1200131: Grounding and Shielding at LIGO
• LIGO-E1300017: First Contact Spray Application & Removal Procedure

Referenced by:

• LIGO-E070271-v2: OMCS Installation Procedure
• LIGO-T1300014-v5: Aligo, BSC Flooring + HAM ISI, Witness Sample Placement Requirements
• LIGO-E1400472-v3: Test Mass In Situ Cleaning Procedure
• LIGO-E1201096-v5: Contamination Sample Handling - How to receive, use, send, buy and store samples.
• LIGO-E1400029: LIGO, Contamination Control Training Material