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= Beam Reducing Telescopes = = Transmission Monitor Telescopes (TMS) =
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Also called "beam reducing telescope (BRT)" in LCGT.
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'''[[KAGRA/Subgroups/AOS| back to AOS top]]'''
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TBD

== Applicable Documents ==
 * Spec. for vacuum chambers
 * Optical Layout Drawing of the LCGT interferometer
 * Length Sensing and Control doc
 * Alignment Sensing and Control doc
 * CCD Monitor doc
 * Any...		  . Transmission monitors for IR/Green beams.
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TBD === Applicable Documents ===
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1122|麻生さんによるデザイン例]]
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Beams for TBD  * 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,
 ||<#FFFF00>Name||<#FFFF00>Type||<#FFFF00>Input ch#||<#FFFF00>Output ch#||<#FFFF00>Purpose||<#FFFF00>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||Remote stirring mirrors for QPDs; 6x2x2ch||MIF||
 ||CCD monitor1||TBD, for 1064nm||On/Off?||VIDEO signal?||CCD monitor||---||
 ||CCD monitor2||TBD, for 532nm||On/Off?||VIDEO signal?||CCD monitor||---||
 ||Shutters||TBD||2||0||On/Off of shutters for high-gain QPDs||MIF||


 . For each TMS suspension and local sensors,
 ||<#FFFF00>Name||<#FFFF00>Type||<#FFFF00>Input ch#||<#FFFF00>Output ch#||<#FFFF00>Purpose||<#FFFF00>Used By||
 ||Actuators for TMS||TBD||12?||0||Remote actuation for TMS||---||
 ||Optical levers for TMS||TBD||0||8||OpLev QPDx2?||---||
 ||Other, related to the suspension itself ||TBD||---||---||---||---||
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TBD  . TBD
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 * BS chamber
 *

== Requirements ==
TBD

== Characteristics ==
TBD		  * At the dedicated chambers in back of ETM chambers
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== Inspection plans ==
TBD

== Links ==
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=29666&version=1|LIGO-T1000746-v1, Viewports Subsystem Final Design Document]]		 == External Links ==
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=6559|LIGO-T0900511-v4, Modeling of Alignment Sensing and Control for Advanced LIGO]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=4559|LIGO-T0900385-v7, The advanced LIGO ETM transmission monitor]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=11582|LIGO-T1000247-v3, ISC Gouy phase telescopes]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=62886|LIGO-E1100537-v10, Transmission Monitor Telescope Suspension (TMS) Final Design]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=60926|LIGO-G1100439-v4, TMS Telescope Alignment]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=58277|LIGO-T1100258-v4, Transmission Monitoring Telescope and Suspension - TMS]]

Transmission Monitor Telescopes (TMS)

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

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

back to AOS top

Contents

  1. Transmission Monitor Telescopes (TMS)
    1. Scope
    2. General Description
      1. Applicable Documents
      2. Functions
      3. Requirements
      4. List of Channels
      5. Naming Conventions
      6. Locations
    3. External Links

Scope

  • Transmission monitors for IR/Green beams.

General Description

Applicable Documents

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

    Remote stirring mirrors for QPDs; 6x2x2ch

    MIF

    CCD monitor1

    TBD, for 1064nm

    On/Off?

    VIDEO signal?

    CCD monitor

    ---

    CCD monitor2

    TBD, for 532nm

    On/Off?

    VIDEO signal?

    CCD monitor

    ---

    Shutters

    TBD

    2

    0

    On/Off of shutters for high-gain QPDs

    MIF
  • For each TMS suspension and local sensors,

    Name

    Type

    Input ch#

    Output ch#

    Purpose

    Used By

    Actuators for TMS

    TBD

    12?

    0

    Remote actuation for TMS

    ---

    Optical levers for TMS

    TBD

    0

    8

    OpLev QPDx2?

    ---

    Other, related to the suspension itself

    TBD

    ---

    ---

    ---

    ---

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)