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End bench telescopes requirements. Matteo Barsuglia, Christelle Buy APC 12 May 2010. Three possible goals. Reduce arm-cavity beam for ISC (ISC requirements) Inject auxiliary lasers (ISC requirements) Send the Hartmann beam for the ETM HR scan (TCS requirements) ?. ISC constraints.
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End bench telescopes requirements Matteo Barsuglia, Christelle Buy APC 12 May 2010
Three possible goals • Reduce arm-cavity beam for ISC (ISC requirements) • Inject auxiliary lasers (ISC requirements) • Send the Hartmann beam for the ETM HR scan (TCS requirements) ?
ISC constraints • Photodiodes • how many? (2 quadrants, 2 longitudinal) • Which waists? Same photodiodes? • Gouy phase constraints ? • Aberrations constraints? • Science mode/lock-acquisition mode? (in aLIGO IR beams are (in any case, can be) dumped during science mode) • Auxiliary lasers • Yes/No? How ? Stability issues? • Stability requirements? In aLIGO there is a suspended - in-vacuum platform
TCS • How inject/detect the Hartmann beams ? • aLIGO scheme (P.Willems)
Present scheme • A lot of new component - Space issues?