LIGO Document T0900144-v4

Adv. LIGO Arm Length Stabilisation Design

Document #:
LIGO-T0900144-v4
Document type:
T - Technical notes
Other Versions:
LIGO-T0900144-v7
08 Nov 2018, 13:19
LIGO-T0900144-v6
04 Mar 2015, 13:44
LIGO-T0900144-v5
20 Jun 2012, 05:44
LIGO-T0900144-v3
05 May 2010, 08:04
LIGO-T0900144-v2
23 Jun 2009, 23:20
LIGO-T0900144-v1
24 Apr 2009, 02:50
Abstract:
The design of the arm length fluctuation system. This system aids in the lock acquisition of the interferometer by stabilising the arm cavity length fluctuations to within ~1.3 nm.
Files in Document:
Notes and Changes:
- Removed the approach section to reduce repetition.
- Inserted transmission table 2.
- Section 3.2.1, change the dynamic range from
1 um_pk to +-5 um (e.g. 10 um peak to peak).
- Included stable Quad feedback using the penultimate mass and the test mass only.
- Major reshuffle of the sections.
- Made the Quad VCO locking strategy the baseline locking approach.

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