# Advanced Virgo + parameters

## Test mass dimensions

Diameter [mm] |
550 |

Thickness [mm] |
200 |

Weight [kg] |
105 |

The coating clear aperture will likely to be 530 mm in diameter.

## Arm cavity configuration

### Common parameters

Cavity length [m] |
3000 |

finesse |
450 |

Transmission IM |
1.4% |

Transmission EM |
5 ppm |

Round trip loss |
75 ppm |

Cavity circulating power |
600 kW |

That is the same parameters as Advanced Virgo, likely some optimisation will be done later on the finesse / recycling gain and hence the circulating power may be different.

### Geometry for large beams on both mirrors

That is the official proposed configuration with larger beams on both input and end mirrors.

RoC _IM [m] |
1378 |

Roc EM [m] |
1635 |

Cavity g-factor |
0.98 |

Beeam radius on IM [mm] |
81 |

Beeam radius on EM [mm] |
96 |

### Geometry for large beam only on end mirror

That is an extreme case where the size of the end mirror is enlarged whereas the size on the input mirror is the same as we have now.

RoC _IM [m] |
1030 |

Roc EM [m] |
2002 |

Cavity g-factor |
0.95 |

Beeam radius on IM [mm] |
46 |

Beeam radius on EM [mm] |
96 |

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JeromeDegallaix - 30 May 2018