LIGO Document T0900043-v8

Optical Layout and Parameters for the Advanced LIGO Cavities

Document #:
LIGO-T0900043-v8
Document type:
T - Technical notes
Other Versions:
LIGO-T0900043-v11
16 Mar 2012, 06:54
LIGO-T0900043-v10
18 Oct 2010, 22:00
LIGO-T0900043-v9
20 Oct 2009, 14:51
LIGO-T0900043-v7
27 Jul 2009, 14:24
LIGO-T0900043-v6
16 Jul 2009, 11:29
LIGO-T0900043-v5
02 Apr 2009, 09:05
LIGO-T0900043-v4
30 Mar 2009, 12:03
LIGO-T0900043-v3
30 Mar 2009, 12:02
LIGO-T0900043-v2
30 Mar 2009, 12:01
LIGO-T0900043-v1
30 Mar 2009, 12:00
LIGO-T0900043-x0
10 Feb 2009, 08:45
Abstract:
This document describes the optical parameters of the various cavities for Advanced LIGO. The lengths between various optical elements, ROC values of the mirrors, and their tolerances are listed. The various cavity parameters like Finesse, linewidths, and transversal mode spacing are calculated. Included also are the higher order modes offsets from resonances. The recycling cavity parameters are picked assuming that the TCS keeps the IFO same for both the cold as well as full power operation. The RC can be matched to a low power IFO state by appropriately changing the recycling cavity mirrors positions.
Files in Document:
Notes and Changes:
The only significant change is the folded signal recycling cavity mirror (SR2) ROC change by a couple of cm. Hiro Yammamoto has kindly checked all the parameters and have pointed that the SRC mode matching was a little bit off. To correct it, SR2 ROC has been changed to -4.89 from -4.87.

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