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Tesi etd-05042006-100306


Thesis type
Tesi di dottorato di ricerca
Author
Barsotti, Lisa
email address
lisa.barsotti@ego-gw.it
URN
etd-05042006-100306
Title
The control of the Virgo interferometer for gravitational wave detection
Settore scientifico disciplinare
FIS/05
Corso di studi
FISICA APPLICATA
Commissione
relatore Prof. Fidecaro, Francesco
relatore Barsuglia, Matteo
Parole chiave
  • Longitudinal control
  • Interferometer
  • Gravitational Waves
  • Control feedback
  • Virgo
Data inizio appello
20/04/2006;
Consultabilità
completa
Riassunto analitico
VIRGO is a recycled Michelson interferometer where each arm is replaced<br>by a 3 km long Fabry-Perot cavity. It is designed to detect gravitational waves emitted by astrophysical sources. Mirrors are suspended in vacuum<br>by high performance suspensions, so that detection is possibly starting from very low<br>frequencies, a few Hz, up to a few kHz.<br>The work presented in this thesis is focused on the longitudinal control of VIRGO,<br>that is the control of the position of the test masses along the light beam direction.<br>Relative displacements of the mirrors need to be actively controlled in order to bring<br>and keep the interferometer on its working point. By following the evolution of the<br>VIRGO commissioning, suitable strategies have been designed and applied to differ-<br>ent optical confgurations: a single Fabry-Perot cavity, a Michelson interferometer<br>with Fabry-Perot cavities in the arms (the recombined ITF), and finally the full<br>interferometer (the recycled ITF). Once the lock of full VIRGO was achieved, the<br>process of investigating and reducing the longitudinal control noises coupled into<br>the dark fringe signal began.<br>
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