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## page was renamed from Upgrade 09/Length Sensing and Control
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This page discusses the design of the LSC system of the 40m Upgrade
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The Power Spectrum for each port is provided. From that we identify the optimum sensing signals.

[...]
-----
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For locking, the baseline plan is to use the same error signals of AdvLIGO:

|| '''DOF''' || '''Signal''' ||
|| CARM || REFL_I1 ||
|| DARM || AS_DC ||
|| PRCL || POP_I1 ||
|| MICH || POP_Q2 ||
|| SRCL || POP_I2 ||

In case that '''3f signals''' will be used for lock acquisition, as a result of Optickle simulations, we propose the following sensing matrix:

|| '''DOF''' || '''Signal''' ||
|| X || POX ||
|| Y || POY ||
|| PRCL || REFL_32I ||
|| MICH || REFL_31I ||
|| SRCL || REFL_32Q ||

[...]
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----
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Antiresonance conditions fro both sidebands [...]
----
=== Schnupp Asymmetry ==
Arguments on the Schunpp asymmetry design;
 * dependence on the asymmetry of central cavity's coupling
 * dependence of sideband output power ("throughput power" - K. Arai) to asymmetry
 * different designs for different PRMs (initial, temporary 10%; final 5.5%)
 * guidelines to change the asymmetry in different circumstances (alignment, etc.)
 * [...]
----
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 * ideal lengths
 * lengths corrections
 * [...]
----
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 * ideal lengths
 * lengths corrections
 * [...]

Length Sensing and Control Design

This page discusses the design of the LSC system of the 40m Upgrade

Ports

The Power Spectrum for each port is provided. From that we identify the optimum sensing signals.

[...]

Sensing Matrix

For locking, the baseline plan is to use the same error signals of AdvLIGO:

DOF

Signal

CARM

REFL_I1

DARM

AS_DC

PRCL

POP_I1

MICH

POP_Q2

SRCL

POP_I2

In case that 3f signals will be used for lock acquisition, as a result of Optickle simulations, we propose the following sensing matrix:

DOF

Signal

X

POX

Y

POY

PRCL

REFL_32I

MICH

REFL_31I

SRCL

REFL_32Q

[...]

Cavity Absolute Lengths

Arm Cavities

Antiresonance conditions fro both sidebands [...]

=== Schnupp Asymmetry == Arguments on the Schunpp asymmetry design;

  • dependence on the asymmetry of central cavity's coupling
  • dependence of sideband output power ("throughput power" - K. Arai) to asymmetry
  • different designs for different PRMs (initial, temporary 10%; final 5.5%)
  • guidelines to change the asymmetry in different circumstances (alignment, etc.)
  • [...]

Power Recycling Cavity

  • ideal lengths
  • lengths corrections
  • [...]

Signal Recycling Cavity

  • ideal lengths
  • lengths corrections
  • [...]

Upgrade_09/Length_Sensing_and_Control_Design (last edited 2012-01-03 23:02:39 by localhost)