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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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Purpose preliminary list

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’?


Step 2 output modecleaner

Output Modecleaner

Step 2: Output modecleaner?

~ 2.1 kW

PRC

125 W

150 W laser


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?


Option dual recycling with omc

Output Modecleaner ~ 17.

Option: dual recycling with OMC?

~ 2.1 kW

PRC

125 W


Proposal
Proposal: ~ 17.

  • 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: ~ 17.

  • Advisory group to meet at Amaldi

  • Brainstorm on :

    • short Michelson ?

    • PR Cavity but with what parameters?

    • PR arm cavity ?

    • Scheduling & Milestones?