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Purpose: Preliminary list

High Power Test Facility - a joint ACIGA/LSC Project? ‘ Initial’ Report David McClelland, David Blair ACIGA LIGO-G010156-00-Z LSC Meeting, March 2001. Purpose: Preliminary list. Diagnose cavity operation, stability and dynamics at LIGO II circulating power (~ 1MW)

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Purpose: Preliminary list

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  1. High Power Test Facility - a joint ACIGA/LSC Project? ‘Initial’ ReportDavid McClelland, David BlairACIGALIGO-G010156-00-ZLSC Meeting, March 2001.

  2. Purpose: Preliminary list • Diagnose cavity operation, stability and dynamics at LIGO II circulating power (~ 1MW) • Investigate thermal deformation and control in high power cavities • Investigate ‘cold’ lock up to full operating power, including changes to control and alignment signals

  3. Purpose (ctd) • field test a high power (>100 W) laser. • field test high power conditioned input optics • validate optical cavity modelling codes • integrate a high power laser system with a high power handling input optics system, a core optics system and a high power photo detection system.

  4. Status • ARC funding commenced January 2001 • LIGO commitment: core (2) and PR & MC optics • Completed • Central laboratory end stations at 80m • 5 vacuum chambers,160m vacuum pipe • Current • Outfitting optics laboratory • Installing vacuum envelope (to LII level) • Building isolation stacks

  5. Optical Design • Rationale • Should be as LIGOII like as possible • Input power, circulating power, spot sizes, cavity stability (g factors), cavity lengths • Allow results to apply to LIGOII • Directly • Simple scaling • Model validation

  6. ?Steps 1: Power Recycling Cavity ~ 2.1 kW PRC 125 W 150 W laser Sapphire optics, rear coated, r ~ 0.9975, thermal correction Fused silica optics, PRM thermal correction? Modecleaner length: 12-18 m PRC: length ~ 12 -15 m, near unstable, spot size ~ LII, PRF ~ 17.

  7. Main problems • PRC near unstable for both carrier and sidebands • ‘worst case scenario’?

  8. Output Modecleaner Step 2: Output modecleaner? ~ 2.1 kW PRC 125 W 150 W laser

  9. Steps 3: PR arm cavityprimary outcome for LII? 80m ~ 10m 125 W ~ 830 kW ~ 2.1 kW Staged: - 80 m stable cavity (g1 g2 ~ 0.3?) - add PR - BS may be used as ‘pick off’ monitor

  10. ~ 830 kW 80m ~ 2.1 kW PRC 125 W Output Modecleaner Option: PR Arm cavity Michelson

  11. PRC: length ~ 12 -15 m, near unstable, spot size ~ LII, PRF ~ 17. SRC, factor variable? Option: dual recycling? ~ 2.1 kW PRC 125 W Sapphire optics, rear coated, r ~ 0.9975, thermal correction Fused silica optics, PRM thermal correction?

  12. Output Modecleaner Option: dual recycling with OMC? ~ 2.1 kW PRC 125 W

  13. Proposal: • Establish the Gingin high power interferometer test facility (HPITFC) as an LSC Facility • Advisory board: • Reitze, U. Florida Blair, UWA • Zucker, MIT Munch, AU • Camp, Caltech (chair) McClelland, ANU • Willke, GEO • Sanders, Caltech • Chair? • Insert in LIGOII planning process

  14. Action: • Advisory group to meet at Amaldi • Brainstorm on : • short Michelson ? • PR Cavity but with what parameters? • PR arm cavity ? • Scheduling & Milestones?

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