Report of the LSC Post-O5 Study Group

Document #:

LIGO-T2200287-v2

Document type:

T - Technical notes

Abstract:

Report for the LSC from the study group assigned to explore options for LIGO detector upgrades after O5.

Files in Document:

• T2200287v2_PO5report.pdf (3.6 MB)

Topics:

• Upgrades
• A# Project
• Reports

Authors:

• Peter Fritschel
• Kevin Kuns
• Jenne Driggers
• Anamaria Effler
• Brian Lantz
• David Ottaway
• Stefan Ballmer
• Katherine Dooley
• Rana Adhikari
• Matthew Evans
• Benjamin Farr
• Gabriela Gonzalez
• Patricia Schmidt
• Sendhil Raja

Notes and Changes:

Main changes for v2:

1. The baseline upgrade recommendation, A#, now includes a reduction
in coating thermal noise (beyond the target A+ level). The baseline
A# strain noise curve uses the thermal noise projected for GaAs/AlGaAs
crystalline coatings, though the report leaves open what the actual
coating solution would be.

2. With the change in the baseline A#, and some changes to the Voyager
design, the collection of interferometer designs used to generate the
science metrics has changed.

3. Section 6.3 has been simplified, and the technical issue it raises
(thermal distortion effects and compensation) will be detailed in a
separate technical report.

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