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

purpose preliminary list
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
purpose ctd
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.
status
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
optical design
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
steps 1 power recycling cavity
?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.

main problems
Main problems
  • PRC near unstable for both carrier and sidebands
    • ‘worst case scenario’?
steps 3 pr arm cavity primary outcome for lii
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

option pr arm cavity michelson

~ 830 kW

80m

~ 2.1 kW

PRC

125 W

Output Modecleaner

Option: PR Arm cavity Michelson
option dual recycling

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?

proposal
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
action
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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