Differences between revisions 20 and 24 (spanning 4 versions)
Revision 20 as of 2012-06-27 17:31:06
Size: 2102
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Revision 24 as of 2012-06-27 17:45:38
Size: 2936
Comment:
Deletions are marked like this. Additions are marked like this.
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For each TMS,
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||QPD1||1064nm QPD||0||4||Mon. Off-centering||MIF||
||QPD2||1064nm QPD||0||4||Mon. Off-centering||MIF||
||QPD2||1064nm QPD||0||4||Mon. Off-centering||MIF||
||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?||---||

Transmission Monitor System (TMS)

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

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


..Up

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

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?

---

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)