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High Power Test Facility Report

This report documents the investigation of high power cavity operation and dynamics, including thermal deformation, control mechanisms, and optical cavity modelling. Aiming to validate codes and integrate advanced laser systems for optimal performance.

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High Power Test Facility Report

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  1. High Power Test Facility ReportDavid McClelland, Bram Slagmolen, John JacobsACIGALSC Meeting, November 203. • LIGO-G030643-00-Z

  2. Purpose • Diagnose cavity operation, stability and dynamics at A/LIGO 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 • 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.

  3. Status • Major funding commenced January 2002 • Staff: • 1 Res. Fellow; 1 Engineer; 5 techs; grad students; academic staff; LIGO 3 person months p.a. • LIGO commitment: • core (2) and PR & MC optics; Suspensions and controllers; high power optical modulators, isolators. • Completed • Central laboratory end stations at 80m + pipe + vacuum • 1 vacuum chamber processed • Laboratory has now gone clean • Current • Slagmolen, Jacobs

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

  5. Step 1: arm cavitySee Bram, John 80m ~ kWatts - 80 m stable cavity (g1 g2 > 0.8?) - 10 W laser - include thermal readout; AOC Step 2: - reverse ITM - increase laser power, 50W?

  6. Steps 3: PR arm cavity ~80m ~ 10m 125 W ~ 830 kW ~ 2.1 kW

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