Differences between revisions 4 and 35 (spanning 31 versions)
⇤ ← Revision 4 as of 2011-07-07 02:37:23 →
Size: 570
Editor: TomotadaAkutsu
Comment:
← Revision 35 as of 2012-11-12 19:57:36 → ⇥
Size: 5427
Editor: TomotadaAkutsu
Comment:
Deletions are marked like this. Additions are marked like this.
Line 1: Line 1:
= Optical Lever = = Optical Levers =
Line 4: Line 4:
'''[[KAGRA/Subgroups/AOS| back to AOS top]]'''
Line 7: Line 8:
Optical lever for LCGT-SAS system  . The scope of optical levers is to sense local angular motions (pitch and yaw) of any mirrors supported by vibration isolation system and other suspended stuffs including suspeded optical benches.
Line 10: Line 11:
 * Spec. for vacuum chambers
 * Optical Layout drawing for LCGT interferometer
 * Any...		  . TBD; just see the links below.
Line 16: Line 15:
=== Receiver and Transmitter ===
Line 20: Line 16:
TBD  . TBD
Line 24: Line 20:
 *  * ITM chambers (X,Y)
 * ETM chambers (X,Y)
 * PRC chambers (PRC, PR2, PR3)
 * SRC chambers (SRC, SR2, SR3)
 * MC chambers (MC1, MC2...)
Line 27: Line 27:
TBD  * Sensor noise should be less than xxx.
 * Sensor's dynamic range should be greater than xxx.
 * At least horizontal degrees of freedom (X,Y)
 * Preferably a vertical sensor (Z) and side
 * The sensors have to be rigidly mounted on the ground so that these are useful for remembering the position of the mirror and recording the drifts.
Line 30: Line 34:
TBD  . Each optical lever consists of an optical system, a frontend circuit, and a human interface software.
 . The optical system consists of the following parts: a light source, optical fibers, a focusing telescope, viewport windows, a detector, and pylons which support the focusing telescope and the detector.
The frontend circuit is TBD. Maybe we need analog cables (and what kind of connector should we use?),
whitening filters and antialiasing filters. Maybe the matrix circuit will be realized using the digital systems, but in commissioning phase, we will need analog matrix.
 . The human interface software is TBD, which shows the mirrors' dofs monitored by Optical Levers.

=== Light source ===
 . For the light source, proposed candidates are
  * superluminous LED (SLED) or
  * laser light source as LIGO.

=== Optical Fibers ===
 . The optical fibers transmit the light from the source to the focusing telescope.

=== Focusing Telescopes ===
 . TBD. Moving linear stage with micrometer and some optical components like collimators?

=== Viewport windows ===
 . See also the [[../Viewport1|viewport subsystem]].
 . It should be transparent for the light source wavelength.
 . There should be no wedge; otherwise the multiple spots of light would be problematic.

 . 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)]]

=== Detectors ===
 . The detector will be an ordinary quadruplet photocondutive circuit with QPD. The noise level at '''xxx''' Hz should be '''xxx''' m/Hz^2^

=== Pylons ===
 . The pylons must be designed.

== Inspection plans ==
 . TBD

== Procurement process and plans ==
 . TBD
Line 33: Line 71:
== Inspection plans ==
TBD		 == Action Items ==
A/I化できたもの、されたもののリスト
|| '''AI_MIF_INVACPD#''' || '''Identified on'''|| '''Assigned to '''||'''Status'''|| '''Description''' ||
|| 001 仕様の確認||20120925||Akutsu|| Closed（20121001）||設計上のdetailをLIGOに確認。どこで真空シールしてるのか？など。20121001にやりとりしたメール参照。||
|| 002 プロトタイプ製作手段の確保||20120925||Akutsu|| Closed（20121107）||NAOJ-ATC/MEかどこかにプロトタイプ製作をかけあう。予算はKAGRAから（？）。→ATCは多忙そうなので某社に相談。新しいAI005へ派生。||
|| 003 プロトタイプ図面作成の指示、レビュー||20120925||Akutsu|| || 回路上のPDの位置やレギュレータ、コネクタの位置によって外箱にあける穴の位置がかわるように見えるので、そのdetailを反映したプロトタイプ図面を、製作してもらうところにつくってもらう→みんなでレビュー||
||004 プロトタイプ発注作業||20120925 ||Akutsu|| || プロトタイプの発注作業||
||005 コネクタ型番||20121107 ||Akutsu||進行中。|| （AI002より派生）某社より、天井コネクタ2種の型番確認依頼。LIGOを通じて問い合わせ中。場合によっては社外秘かなにかで明らかにされれない可能性もあり。||
Line 36: Line 80:
== Procurement process and plans ==
TBD
Line 39: Line 81:

<<Anchor(Links)>>
Line 40: Line 84:
 . <!> Some of the LIGO documents listed below are '''NOT''' public; to access them, you may need your own LSC account.
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22686|LIGO-M1000343, Advanced LIGO Review Committee Report: Test Mass Optical Lever FDR]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=15032|LIGO-T1000517, Optical levers Final Design Review for test masses, recycler mirrors and HAM optical benches]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=70690|LIGO-G1100961, Long-Term Stability Test for aLIGO Optical Levers]]

 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=418|JGW-­G1100418, LCGT vacuum chamber envelope study]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=15271|LIGO-T1000533, Super-luminescent LED 21 and 50 day trend analysis]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=13338|LIGO-T1000390, Trade-off Study for the Optical Lever Light Source]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=11010|LIGO-T1000219, Test mass optical levers preliminary design]]

Optical Levers

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

back to AOS top

Contents

  1. Optical Levers
    1. Scope
    2. Applicable Documents
    3. General Description
      1. Naming Conventions
      2. Locations
    4. Requirements
    5. Characteristics
      1. Light source
      2. Optical Fibers
      3. Focusing Telescopes
      4. Viewport windows
      5. Detectors
      6. Pylons
    6. Inspection plans
    7. Procurement process and plans
    8. Action Items
    9. Links

Scope

  • The scope of optical levers is to sense local angular motions (pitch and yaw) of any mirrors supported by vibration isolation system and other suspended stuffs including suspeded optical benches.

Applicable Documents

  • TBD; just see the links below.

General Description

Naming Conventions

  • TBD

Locations

  • BS chamber
  • ITM chambers (X,Y)
  • ETM chambers (X,Y)
  • PRC chambers (PRC, PR2, PR3)
  • SRC chambers (SRC, SR2, SR3)
  • MC chambers (MC1, MC2...)

Requirements

  • Sensor noise should be less than xxx.
  • Sensor's dynamic range should be greater than xxx.
  • At least horizontal degrees of freedom (X,Y)
  • Preferably a vertical sensor (Z) and side
  • The sensors have to be rigidly mounted on the ground so that these are useful for remembering the position of the mirror and recording the drifts.

Characteristics

  • Each optical lever consists of an optical system, a frontend circuit, and a human interface software.
  • The optical system consists of the following parts: a light source, optical fibers, a focusing telescope, viewport windows, a detector, and pylons which support the focusing telescope and the detector.

The frontend circuit is TBD. Maybe we need analog cables (and what kind of connector should we use?), whitening filters and antialiasing filters. Maybe the matrix circuit will be realized using the digital systems, but in commissioning phase, we will need analog matrix.

  • The human interface software is TBD, which shows the mirrors' dofs monitored by Optical Levers.

Light source

  • For the light source, proposed candidates are
    • superluminous LED (SLED) or
    • laser light source as LIGO.

Optical Fibers

  • The optical fibers transmit the light from the source to the focusing telescope.

Focusing Telescopes

  • TBD. Moving linear stage with micrometer and some optical components like collimators?

Viewport windows

Detectors

  • The detector will be an ordinary quadruplet photocondutive circuit with QPD. The noise level at xxx Hz should be xxx m/Hz2

Pylons

  • The pylons must be designed.

Inspection plans

  • TBD

Procurement process and plans

  • TBD

Action Items

A/I化できたもの、されたもののリスト

AI_MIF_INVACPD#

Identified on

Assigned to

Status

Description

001 仕様の確認

20120925

Akutsu

Closed（20121001）

設計上のdetailをLIGOに確認。どこで真空シールしてるのか？など。20121001にやりとりしたメール参照。

002 プロトタイプ製作手段の確保

20120925

Akutsu

Closed（20121107）

NAOJ-ATC/MEかどこかにプロトタイプ製作をかけあう。予算はKAGRAから（？）。→ATCは多忙そうなので某社に相談。新しいAI005へ派生。

003 プロトタイプ図面作成の指示、レビュー

20120925

Akutsu

回路上のPDの位置やレギュレータ、コネクタの位置によって外箱にあける穴の位置がかわるように見えるので、そのdetailを反映したプロトタイプ図面を、製作してもらうところにつくってもらう→みんなでレビュー

004 プロトタイプ発注作業

20120925

Akutsu

プロトタイプの発注作業

005 コネクタ型番

20121107

Akutsu

進行中。

（AI002より派生）某社より、天井コネクタ2種の型番確認依頼。LIGOを通じて問い合わせ中。場合によっては社外秘かなにかで明らかにされれない可能性もあり。

LCGT/subgroup/AOS/OptLev1 (last edited 2018-02-03 13:07:02 by KousekiMiyo)