Effects of cold aberrations on the longitudinal error signals and its compensation
The target sensitivity of Advanced Virgo+ for the fourth observation run, O4 is about 90-120Mpc in the BNS range. To achieve this, several hardware upgrades are under process. One of the most relevant upgrades concerns installation of the signal recycling mirror (SR), which forms an additional marginally stable cavity along with the power recycling cavity (PRC) which was already present in Advanced Virgo. The marginality of the recycling cavities makes longitudinal control very sensitive to aberrations. Thus, to compensate for the cold optical aberrations present in the DRMI of Advanced Virgo+, an upgrade of the system has been done to increase the power available for the central heating (CH) actuator and make it compliant with the requirements for O4. The study is done for cold defects and their mitigation, in particular, their effects on the longitudinal error signals and on the sidebands’ power, which are required for locking the DRMI of Advanced Virgo+. Thus, the focus of this paper is on Dual Recycled Michelson (DRMI) and the effects of cold aberrations on control of longitudinal degrees of freedom in Advanced Virgo+.
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