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== Preface ==
This is a draft of the ICD for the LCGT-ISC sub-system.
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== Sub-System Definition ==
The role of the Interferometer Sensing and Control (ISC) sub-system is to keep the interferometer at its optimal operation point and extract the gravitational wave signal with low noise. This sub-system can be functionally broken into two parts: Sensing and Control.
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=== Sensing ===
In order to control the interferometer, we have to know the state of the interferometer. Sensing part of this sub-system defines the methods to extract information about the state of the interferometer. We sort the degrees of freedom of an interferometer into three categories.

==== Length Sensing ====
There are 5 length DOFs to be controlled for a Dual-Recycled Fabry-Perot Michelson Interferometer (DRFPMI).
||Name||Notation||Description||
||Michelson (MICH)||l-||Differential change of the Michelson arm lengths||
||Power Recycling Cavity Length (PRCL)||l+||Length of the power recycling cavity||
||Signal Recycling Cavity Length (SRCL)||ls||Length of the signal recycling cavity||
||Differential Arm Length (DARM)||L-||Differential change of the arm cavity lengths||
||Common Arm Length (CARM)||L+||Common change of the arm cavity lengths||

 
==== Alignment Sensing ====
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=== Control ===

-----		 [[attachment:ISC_ICD_2010_04_19.doc|2010/4/19]]

Interface Control Document for the ISC sub-system

2010/4/19

LCGT/subgroup/ifo/ISC/ICD (last edited 2010-06-03 11:57:09 by YoichiAso)