Differences between revisions 1 and 29 (spanning 28 versions)

Transmission Monitor System (TMS)

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

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

..Up

Contents

Transmission Monitor System (TMS)

Scope

Transmission monitors for IR/Green beams.

General Description

Applicable Documents

麻生さんによるデザイン例

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

External Links

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

-  ⇤ ← Revision 1 as of 2011-07-03 04:17:00 → 
  Size: 744
  Editor: TomotadaAkutsu
  Comment:
+   ← Revision 29 as of 2012-07-13 20:14:11 → ⇥
  Size: 3305
  Editor: TomotadaAkutsu
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-= Beam Reducing Telescopes =
+= Transmission Monitor System (TMS) =
 Line 3:
+Also called "beam reducing telescope (BRT)" in LCGT.
-Line 4:
+Line 7:
+'''[[../|..Up]]'''
-Line 7:
+Line 11:
-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.
-Line 18:
+Line 14:
-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]]
-Line 21:
+Line 18:
-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||---||---||---||---||
-Line 27:
+Line 60:
- * BS chamber
 * 

== Requirements ==
TBD

== Characteristics ==
TBD
+ * At the dedicated chambers in back of ETM chambers
-Line 37:
+Line 63:
-== 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/private/DocDB/ShowDocument?docid=4559|LIGO-T0900385-v7, The advanced LIGO ETM transmission monitor]]
 * [[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]]