Engagement of the thermal compensation system in Advanced Virgo for O3 observing run.
Nardecchia I., Aiello L., Cesarini E., Fafone V., Lorenzini M., Minenkov Y., Rocchi A.,
III - Astrofisica
Aula GSSI Rettorato - Auditorium - Venerdì 27 h 09:00 - 12:00
» Download abstract
In view of O3, the interferometer optical power has been doubled with respect to the previous one to improve its sensitivity at high frequency. At this level of input power, the thermal distortions, induced by absorption inside the optics, degrade the interferometer performance reducing the quality of the control signals and consequently the duty cycle of the instrument. A dedicated thermal compensation system is currently enganged to monitor and compensate the wavefront distortion with an accuracy of the order of nanometers ensuring a duty cycle of Advanced Virgo during O3 higher than 90%. An overview of the system will be given, along with the main achievements during the pre-O3 interferometer commissioning.