daniel.sigg@LIGO.ORG - posted 12:11, Thursday 07 June 2018 (42384)
New ALS Parameters
The new green power transmission coefficients for the test masses are:
| Old | New | |
|---|---|---|
| ETMX | 37% | 7.9% |
| ETMY | 32% | 7.9% |
| ITMX | 1.1% | 0.96% |
| ITMY | 1.1% | 1.1% |
Assuming 10 mW input power, the expectations for the new arm cavity parameters are:
| Old | New | |||
|---|---|---|---|---|
| X-arm | Y-arm | X-arm | Y-arm | |
| Finesse | 13 | 16 | 68 | 67 |
| Cavity Pole | 1.4 kHz | 1.2 kHz | 275 Hz | 280 Hz |
| Intra cavity power | 83 mW | 99 mW | 390 mW | 380 mW |
| Reflected power | 9.1 mW | 8.9 mW | 6.2 mW | 5.8 mW |
| Transmitted power | 0.9 mW | 1.1 mW | 3.8 mW | 4.2 mW |
The attached plot shows cavity power and PDH signals for fundamental, first-order and second-order modes as function of round-trip wavelength. The left column is for the old cavity parameters.
Non-image files attached to this report
