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⇤ ← Revision 22 as of 2012-06-27 17:35:49 →
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Editor: TomotadaAkutsu
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Size: 2423
Editor: TomotadaAkutsu
Comment:
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||Stirring mirrors for QPDs||TBD||6x2x2=24||Stirring mirrors for QPDs||MIF|| ||Stirring mirrors for QPDs||TBD||24||0||Stirring mirrors for QPDs; 6x2x2ch||MIF||

Transmission Monitor System (TMS)

Related subgroups: IOO, MIF, VAC, CRY, VIS...

Also called "beam reducing telescope (BRT)" in LCGT.

..Up

Contents

  1. Transmission Monitor System (TMS)
    1. Scope
    2. General Description
      1. Functions
      2. Requirements
      3. List of Channels
      4. Naming Conventions
      5. Locations
    3. Links

Scope

Transmission monitors for IR/Green beams.

General Description

Functions

  • Collect 1064nm and 532nm light transmitting ETMs.
  • Monitor the off-centering and pitch/yaw fluctuations of the ITMs/ETMs relative to the preselected optical path.
  • Monitor the shape of the beam modes that transmit the arm cavity.

Requirements

For each TMS,

  • 2QPDs for 1064nm are required to monitor off-centering of the beam; one is for high gain, the other is for low gain.
  • 2QPDs for 1064nm are required to monitor pitch/yaw misalignments of the beam; one is for high gain, the other is for low gain.
  • 2QPDs for 532nm are required.
  • Remote stirring mirrors for QPDs are required at least in the initial commissioning phase.
  • Remote actuators for TMS chassis would be required.
  • CCD monitors for monitoring the beam mode transmitting the ETM are required.
  • Optical levers (or equivalent local monitors) are required.
  • Suspension system will require more signal channels?
  • Shutters for high gain QPDs are required.

List of Channels

For each TMS,

Name

Type

Input ch#

Output ch#

Purpose

Used By

QPD1H

1064nm QPD

0

4

Mon. off-centering, high gain

MIF

QPD1L

1064nm QPD

0

4

Mon. off-centering, low gain

MIF

QPD2H

1064nm QPD

0

4

Mon. misalignment, high gain

MIF

QPD2L

1064nm QPD

0

4

Mon. misalignment, low gain

MIF

QPD1G

532nm QPD

0

4

Mon. off-centering, low gain

MIF

QPD2G

532nm QPD

0

4

Mon. misalignment, low gain

MIF

Stirring mirrors for QPDs

TBD

24

0

Stirring mirrors for QPDs; 6x2x2ch

MIF

Naming Conventions

TBD

Locations

  • At the dedicated chambers in back of ETM chambers

LCGT/subgroup/AOS/BeamReduceTelescope1 (last edited 2012-09-28 03:45:15 by TomotadaAkutsu)