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| = Beam Reducing Telescopes = | = Transmission Monitor System (TMS) = |
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Also called "beam reducing telescope (BRT)" in LCGT. |
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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 | |
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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 === ||<#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. Off-centering, low gain||MIF|| |
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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 |
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| * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=29666&version=1|LIGO-T1000746-v1, Viewports Subsystem Final Design Document]] | * [[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 System (TMS)
Related subgroups: IOO, MIF, VAC, CRY, VIS...
Also called "beam reducing telescope (BRT)" in LCGT.
Contents
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
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. Off-centering, low gain |
MIF |
Naming Conventions
TBD
Locations
- At the dedicated chambers in back of ETM chambers