Intensity Stabilization Servo Plan

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Presentation transcript:

Intensity Stabilization Servo Plan May 10, 2019 Intensity Stabilization Servo Plan Yuta Michimura Department of Physics, University of Tokyo

Scope Start discussion on the sevo topology of the bKAGRA intensity stabilization servo (ISS) Start from following the aLIGO design Related documents: - Optics Express 20, 10617 (2012) (aLIGO ISS/FSS paper) - Optics Letters 34, 2912 (2009) (aLIGO ISS paper) - LIGO-T0900649 (aLIGO PSL Final Design) - JGW-G1503293 (bKAGRA laser development status) - JGW-T1200913 (requirement from MIF)

Requirement see related documents for the real spectra

aLIGO Topology medium power amplifier high power oscillator PMC NPRO FI FI AOM medium power amplifier high power oscillator PMC Finesse: 130 Round trip length: 2.02 m IMC Finesse: 475 Round trip length: 32.9 m

bKAGRA Topology Plan PMC design not fixed yet What do we do for the noise eater servo? Any feedback to fiber amps and/or solid state amps? NPRO FI AOM PMC Finesse: 155 ? Round trip length: 1.95 m ? FI IMC Finesse: 500 Round trip length: 53.3 m fiber amplifier solid state amplifier