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Related subsystems: IOO, MIF, VAC, CRY,... '''''Related subgroups:''''' MIR, IOO, MIF, VAC, CRY, VIS...
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'''[[KAGRA/Subgroups/AOS| back to AOS top]]'''
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This subsystem provides the optical viewports to pass through the optical beams from the vacuum chambers in which LCGT main interferometer is stored. This subsystem provides the optical viewports mounted on the vacuum chambers to pass the optical beams into or from the LCGT in-vacuum interferometer.
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The viewport subsystems that will be applied to the cryo-vacuum chambers for ITMs/ETMs of the future LCGT are '''NOT''' included in the scope of this subsystem so far. Cryo-vacuum viewports are '''NOT''' included in the scope of this subsystem so far.
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== Introduction ==
We can extract optical beams from the interferometer inside the vacuum chamber at the viewports.
The optical beams are for length control scheme of the interferometer, alignment control scheme of the mirrors, optical levers for LCGT-SUS, and other monitoring devices (CCD or equivalents).

Stray lights?

=== Applicable Documents ===		 == Applicable Documents ==
 * Spec. for vacuum chambers
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 * Length Sensing doc
 * Alignment Sensing doc		  * Length Sensing and Control doc
 * Alignment Sensing and Control doc
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=== Definitions === == General Description ==
At the viewports, we can extract optical beams from the interferometer placed inside the vacuum chambers.
The optical beams would be utilized for length and alignment sensing and control scheme, optical levers for suspensions, and other monitoring devices (CCD or equivalent video cameras).

For example, the viewport would be equipped with
 * AR coating for 1064 nm and 532 nm
 * Wedge angle
Details are described in ''Characteristics'' section.
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== General Description == === Functions ===
Beams for
 * Transmission of IR/Green lasers
 * Optical Lever transmitter/receiver
 * Video camera
 * Illumination
 * Diagnostic
 * (Squeeze)
 * (Spare)
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== Naming Conventions == === Naming Conventions ===
TBD
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== Viewport Locations ==
 * BS chamber
 *
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== Links ==
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=29666&version=1|LIGO-T1000746-v1, Viewports Subsystem Final Design Document]]		 <<Anchor(Locations)>>
=== Locations ===
Here, the number of viewports required by each subsystem at each vacuum chamber is listed.

||<#FFFF00>Chamber Name||<#FFFF00>Type||<#FFFF00>Quantity||<#FFFF00>Purpose||<#FFFF00>Used By||
||PRM||1064nm AR||1||REFL port||ISC||
||PRM||!OpLev wavelength||2||!OpLev||AOS/SUS||
||PRM ||Visible||1||CCD||Everyone||
||PR2||1064nm&532 dichroic AR||1 or 2||POP/Green||ISC||
||PR2||!OpLev wavelength||2||!OpLev||AOS/SUS||
||PR2 ||Visible||1||CCD||Everyone||
||PR3||!OpLev wavelength||2||!OpLev||AOS/SUS||
||PR3 ||Visible||1||CCD||Everyone||
||BS ||1064nm AR||1||POX/POY beams||ISC||
||BS ||!OpLev wavelength||2||Optical Lever||AOS/SUS||
||BS ||Visible||1||CCD||Everyone||
||ITMX||!OpLev wavelength||2||!OpLev||AOS/SUS||
||ITMX||Visible||1||CCD||Everyone||
||ITMY||!OpLev wavelength||2||!OpLev||AOS/SUS||
||ITMY||Visible||1||CCD||Everyone||
||ETMX||1064nm&532 dichroic AR||1||Transmission||ISC||
||ETMX||!OpLev wavelength||2||!OpLev||AOS/SUS||
||ETMX||Visible||1||CCD||Everyone||
||ETMY||1064nm&532 dichroic AR||1||Transmission||ISC||
||ETMY||!OpLev wavelength||2||!OpLev||AOS/SUS||
||ETMY||Visible||1||CCD||Everyone||
||SRM||1064nm AR||1||AS port||ISC||
||SRM||!OpLev wavelength||2||!OpLev||AOS/SUS||
||SRM ||Visible||1||CCD||Everyone||
||SR2||1064nm&532 dichroic AR||1 or 2||POS/Green||ISC||
||SR2||!OpLev wavelength||2||!OpLev||AOS/SUS||
||SR2 ||Visible||1||CCD||Everyone||
||SR3||!OpLev wavelength||2||!OpLev||AOS/SUS||
||SR3 ||Visible||1||CCD||Everyone||


== Requirements ==
TBD

== Characteristics ==
TBD


== Inspection plans ==
See [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1231|JGW-T1201231, Effect due to viewports for optical lever (in Japanese)]]


== Procurement process and plans ==
TBD


== External Links ==
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=29666|LIGO-T1000746-v1, Viewports Subsystem Final Design Document]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=13226|LIGO-E1000246, 6.0 inch Vacuum Viewport Specification]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=61876|LIGO-T1100292, Viewport Source List]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=39955|LIGO-E1100247, Viewport Production Plan]]


 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=8509|LIGO-T1000022-v4, Viewports Subsystem Requirements Document]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=12798|LIGO-T1000334-v1, Review Report Interferometer Sensing and Control Final Design]]

Viewports (at Room Temperature)

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

back to AOS top

Contents

  1. Viewports (at Room Temperature)
    1. Scope
    2. Applicable Documents
    3. General Description
      1. Functions
      2. Naming Conventions
      3. Locations
    4. Requirements
    5. Characteristics
    6. Inspection plans
    7. Procurement process and plans
    8. External Links

Scope

This subsystem provides the optical viewports mounted on the vacuum chambers to pass the optical beams into or from the LCGT in-vacuum interferometer. The optical beams include...

Cryo-vacuum viewports are NOT included in the scope of this subsystem so far.

Applicable Documents

  • Spec. for vacuum chambers
  • Optical Layout Drawing of the LCGT interferometer
  • Length Sensing and Control doc
  • Alignment Sensing and Control doc
  • Optical lever doc
  • CCD Monitor doc
  • Any...

General Description

At the viewports, we can extract optical beams from the interferometer placed inside the vacuum chambers. The optical beams would be utilized for length and alignment sensing and control scheme, optical levers for suspensions, and other monitoring devices (CCD or equivalent video cameras).

For example, the viewport would be equipped with

  • AR coating for 1064 nm and 532 nm
  • Wedge angle

Details are described in Characteristics section.

Functions

Beams for

  • Transmission of IR/Green lasers
  • Optical Lever transmitter/receiver
  • Video camera
  • Illumination
  • Diagnostic
  • (Squeeze)
  • (Spare)

Naming Conventions

TBD

Locations

Here, the number of viewports required by each subsystem at each vacuum chamber is listed.

Chamber Name

Type

Quantity

Purpose

Used By

PRM

1064nm AR

1

REFL port

ISC

PRM

OpLev wavelength

2

OpLev

AOS/SUS

PRM

Visible

1

CCD

Everyone

PR2

1064nm&532 dichroic AR

1 or 2

POP/Green

ISC

PR2

OpLev wavelength

2

OpLev

AOS/SUS

PR2

Visible

1

CCD

Everyone

PR3

OpLev wavelength

2

OpLev

AOS/SUS

PR3

Visible

1

CCD

Everyone

BS

1064nm AR

1

POX/POY beams

ISC

BS

OpLev wavelength

2

Optical Lever

AOS/SUS

BS

Visible

1

CCD

Everyone

ITMX

OpLev wavelength

2

OpLev

AOS/SUS

ITMX

Visible

1

CCD

Everyone

ITMY

OpLev wavelength

2

OpLev

AOS/SUS

ITMY

Visible

1

CCD

Everyone

ETMX

1064nm&532 dichroic AR

1

Transmission

ISC

ETMX

OpLev wavelength

2

OpLev

AOS/SUS

ETMX

Visible

1

CCD

Everyone

ETMY

1064nm&532 dichroic AR

1

Transmission

ISC

ETMY

OpLev wavelength

2

OpLev

AOS/SUS

ETMY

Visible

1

CCD

Everyone

SRM

1064nm AR

1

AS port

ISC

SRM

OpLev wavelength

2

OpLev

AOS/SUS

SRM

Visible

1

CCD

Everyone

SR2

1064nm&532 dichroic AR

1 or 2

POS/Green

ISC

SR2

OpLev wavelength

2

OpLev

AOS/SUS

SR2

Visible

1

CCD

Everyone

SR3

OpLev wavelength

2

OpLev

AOS/SUS

SR3

Visible

1

CCD

Everyone

Requirements

TBD

Characteristics

TBD

Inspection plans

See JGW-T1201231, Effect due to viewports for optical lever (in Japanese)

Procurement process and plans

TBD

LCGT/subgroup/AOS/Viewport1 (last edited 2012-09-16 20:40:35 by KiwamuIzumi)