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CITF performances
by
Jerome Degallaix
—
last modified
2015-03-06 16:52
Simulations done with DarkF and the actual measured maps. The full interferometer is simulated with perfect EM. No signal recycling, as the first stage of Advanced Virgo.
2 points regarding the following results:
- The SB gain and overlap is related to the PRC circulating field, so as extracted by the POP.
- For reference: for the simulation, North arm with IM02 and CP02 and West arm with IM04 and CP04
Starting point: the perfect interferometer (can not get better than that):
| PRC carrier Gain | Carrier overlap with TEM00 | SB sideband gain | SB overlap with TEM00 |
| 36.5 | 100% | 68.4 | 100% |
The worst case: incuding all the maps with no correction:
| PRC carrier Gain | Carrier overlap with TEM00 | SB sideband gain | SB overlap with TEM00 |
| 30.7 | 97.6% | 4.8 | 22% |
If we suppose a perfect correction of the curvature:
| PRC carrier Gain | Carrier overlap with TEM00 | SB sideband gain | SB overlap with TEM00 |
| 34.4 | 99.9% | 58.5 | 88% |
And now replacing one by one the CITF optics with the equivalent perfect one.
| Optic replaced | PRC carrier Gain | SB sideband gain | SB overlap with TEM00 |
| All is perfect | 100% | 100% | 100% |
| All the real optics | 94% | 86% | 88% |
| PRM | 94% | 85% | 88% |
| POP | 94% | 88% | 90% |
| BS | 96% | 87% | 89% |
| CP02 | 94% | 86% | 88% |
| CP04 | 94% | 94% | 95% |
| IM02 | 96% | 85% | 87% |
| IM04 | 95% | 86% | 88% |