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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
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