|
Size: 1427
Comment:
|
Size: 3471
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 3: | Line 3: |
| . ''''' The goal is to help the DRMI commissioning which will be performed at LLO.''''' | . ''''' To help the DRMI commissioning that will be performed at LLO.''''' |
| Line 5: | Line 5: |
| . In the aLIGO schedule ''''' a DRMI test will start on May 2011 at LLO. ''''' Prior to the DRMI test we, the 40m lab, should help their commissioning to make the things smooth and painless at the site. Moreover any commissioning test that will be performed at LLO should have been well predicted and tested at the 40m so that the people at the site can easily pass through all the commissioning test and possibly can spend time for a real trouble shooting (commissioning) to fix unexpected issues. | . In the aLIGO schedule ''''' a DRMI test will start on May 2011 at LLO. ''''' Prior to the DRMI test we, the 40m lab, should help their commissioning to make the things smooth and hence allow to finish the commissioning in the shortest time. Moreover any commissioning tests that will be performed at LLO should be well predicted and tested at the 40m so that the people at the site can easily pass through all the commissioning tests and possibly can spend time for a real trouble shooting (commissioning) to fix unexpected issues. . So for this purpose some recipes must be prepared by the 40m lab. Each recipe includes descriptions about how to make a commissioning test, how to estimate important parameters and the results at the 40m. Additionally some useful scripts must be developed at the 40m. |
| Line 7: | Line 8: |
| [[BR]] | |
| Line 12: | Line 12: |
| [[BR]] | |
| Line 13: | Line 14: |
| [[BR]] | <<Anchor(plantop)>> |
| Line 15: | Line 16: |
| == Schnupp asymmetry == | == Schnupp asymmetry measurement and its adjustment == |
| Line 17: | Line 18: |
| . {{{ Schnupp asymmetry = 0.0342 [m] +/- XXX [mm] }}} . The Schnupp asymmetry determines the reflectivity '' r ''and transmissivity '' t '' of the Michelson for the f1 and f2 sidebands when the carrier is kept in the dark condition. In the design the f2 sideband should be critical coupling for the dual recycling cavity. To achieve the critical coupling we should adjust '' r '' and '' t'' properly. . According to a simulation the asymmetry should be within the precision of XXX mm to achieve more than 95 % of the power build up. |
|
| Line 18: | Line 26: |
| . Here is an instruction how to measure the Schnupp asymmetry. | |
| Line 19: | Line 28: |
| [[BR]] == Cavity length == === Requirements === === How to === === Results === [[BR]] == Recycling gains == === How to === === Results === [[BR]] |
. The result at the 40m was ... and the precision was +/- XXX mm. This implies us to fix the length of the asymmetry. |
| Line 33: | Line 31: |
| [[BR]][[BR]] ------ == PRC length measurement and its adjustment == === Requirements === . {{{ lprc = 6.7538 [m] +/- XXX [mm] }}} . In order to resonate both f1 and f2 sidebands the length should be adjusted to .. . In addition to that the arm makes the non-zero phase shift on these sidebands and makes the .. === How to === . To measure the length of the recycling cavity, === Results === . [[BR]][[BR]] ------ == SRC length measurement == === Requirements === . {{{ lsrc = 5.39915 [m] +/- XXX mm }}} === How to === . === Results === . [[BR]][[BR]] ------ == Recycling gain measurements == . Since the recycling gain is related to loss in the recycling cavity,... === How to === . === Results === . {{{ Carrirer = XX f1 sideband = YY f2 sideband = ZZ }}} [[BR]][[BR]] ------ == Beam spot position on BS == === Requirements === {{{ off-centering < XXX mm }}} . To get a clean AS signal === How to === === results === [[BR]][[BR]] ------ |
|
| Line 36: | Line 89: |
| [[BR]] | [[BR]][[BR]] |
| Line 38: | Line 91: |
== Sensing matrix == |
------ == Sensing matrix check == |
| Line 42: | Line 95: |
| [[BR]] | [[BR]][[BR]] |
| Line 44: | Line 97: |
| == Actuator responses == | ------ == Calibration of Actuator responses == |
| Line 47: | Line 101: |
| [[BR]] | [[BR]][[BR]] |
| Line 49: | Line 103: |
| ------ | |
| Line 53: | Line 108: |
| [[BR]][[BR]] | |
| Line 54: | Line 110: |
| [[BR]] | ------ |
| Line 58: | Line 114: |
| [[BR]][[BR]] | |
| Line 59: | Line 116: |
| [[BR]] == Suspension Positioning == |
------ == Locking procedure == === How to === [[BR]][[BR]] ------ == MICH actuator decoupling == |
| Line 63: | Line 125: |
| === Results === | [[BR]] [[BR]] |
| Line 65: | Line 128: |
| [[BR]] | [#plantop back to top] |
Interferometer Characterization at the 40m prototype
Goals
To help the DRMI commissioning that will be performed at LLO.
Motivations
In the aLIGO schedule a DRMI test will start on May 2011 at LLO. Prior to the DRMI test we, the 40m lab, should help their commissioning to make the things smooth and hence allow to finish the commissioning in the shortest time. Moreover any commissioning tests that will be performed at LLO should be well predicted and tested at the 40m so that the people at the site can easily pass through all the commissioning tests and possibly can spend time for a real trouble shooting (commissioning) to fix unexpected issues.
- So for this purpose some recipes must be prepared by the 40m lab. Each recipe includes descriptions about how to make a commissioning test, how to estimate important parameters and the results at the 40m. Additionally some useful scripts must be developed at the 40m.
Contents
- Interferometer Characterization at the 40m prototype
-
DRMI Characterization Plan at the 40m
- Schnupp asymmetry measurement and its adjustment
- PRC length measurement and its adjustment
- SRC length measurement
- Recycling gain measurements
- Beam spot position on BS
- Reflectivity check
- Sensing matrix check
- Calibration of Actuator responses
- f2a filter adjustment
- IFO modeling
- Locking procedure
- MICH actuator decoupling
DRMI Characterization Plan at the 40m
Schnupp asymmetry measurement and its adjustment
Requirement
Schnupp asymmetry = 0.0342 [m] +/- XXX [mm]
The Schnupp asymmetry determines the reflectivity r and transmissivity t of the Michelson for the f1 and f2 sidebands when the carrier is kept in the dark condition. In the design the f2 sideband should be critical coupling for the dual recycling cavity. To achieve the critical coupling we should adjust r and t properly.
- According to a simulation the asymmetry should be within the precision of XXX mm to achieve more than 95 % of the power build up.
How to
- Here is an instruction how to measure the Schnupp asymmetry.
Results
- The result at the 40m was ... and the precision was +/- XXX mm. This implies us to fix the length of the asymmetry.
PRC length measurement and its adjustment
Requirements
- {{{ lprc = 6.7538 [m] +/- XXX [mm]
}}}
- In order to resonate both f1 and f2 sidebands the length should be adjusted to ..
- In addition to that the arm makes the non-zero phase shift on these sidebands and makes the ..
How to
- To measure the length of the recycling cavity,
Results
SRC length measurement
Requirements
- {{{ lsrc = 5.39915 [m] +/- XXX mm }}}
How to
Results
Recycling gain measurements
- Since the recycling gain is related to loss in the recycling cavity,...
How to
Results
Carrirer = XX f1 sideband = YY f2 sideband = ZZ
Beam spot position on BS
Requirements
{{{ off-centering < XXX mm }}}
- To get a clean AS signal
How to
results
Reflectivity check
How to
Results
Sensing matrix check
How to
Results
Calibration of Actuator responses
How to
Results
f2a filter adjustment
Requirement
How to
Results
IFO modeling
How to
Results
Locking procedure
How to
MICH actuator decoupling
Requirements
How to
[#plantop back to top]