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Size: 2102
Comment:
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Size: 2936
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 33: | Line 33: |
| For each TMS, | |
| Line 34: | Line 35: |
| ||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.
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
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