1 / 6

Pick-off beams in the central Interferometer of Advanced Virgo

Pick-off beams in the central Interferometer of Advanced Virgo. Stefan Hild January 2009. Creation points of Pick-off beam. All Anti-reflex coatings potentially cause secondary beams. Pick-off beams have about 10 to 20mW (6ppm x 2.7kW)

tejano
Download Presentation

Pick-off beams in the central Interferometer of Advanced Virgo

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Pick-off beams in the central Interferometer of Advanced Virgo Stefan Hild January 2009

  2. Creation points of Pick-off beam • All Anti-reflex coatings potentially cause secondary beams. • Pick-off beams have about 10 to 20mW (6ppm x 2.7kW) • Pick-off beams are of similar size as the main IFO beam (LARGE!) • These 15 (18) beams should either be detected or properly dumped 2 beams 4 beams 3 beams from PRC (+3 beams from SRC) 4 beams 2 beams January 2009

  3. Why more pick-off beams than in Virgo? January 2009

  4. Input mirror AR coating • Can an Etalon (A) be control-led well enough with the CP so close by? • C should be avoided, because of scattered light. • D: one beam is strongly divergent. January 2009

  5. Pick-offs from the CPs • CP is probably primary pick-off for ISC. • For ASC it might be important to have no overlapping beams (distributing the secondary beams in 3D). • Divergence of CP pick-offs depends on IM backsurface (lens or not). • If we get the CP pick-offs to work for ISC, we can probably dump the B5 beam. January 2009

  6. Secondary reflections from BS • 3 beams from within PRC needs to be dealt with for AdV. • What to do about the 3 beams from within the SRC (in contrast they are not differential)? • Do we need B5 or can it be dumped? Currently not dumped beam January 2009

More Related