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Input Optics (IO)

Input Optics (IO) . Cost and Schedule Breakout Presentation NSF Review of Advanced LIGO Project. David Reitze UF. $368k. $847k . $1.98 M. Input Optics Description & Deliverables. $3.35 M.

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Input Optics (IO)

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  1. Input Optics (IO) Cost and Schedule Breakout Presentation NSF Review of Advanced LIGO Project David Reitze UF

  2. $368k $847k $1.98 M Input Optics Description & Deliverables $3.35 M The Input Optics conditions the light from the Pre-Stabilized Laser and sends it on to the main interferometer optical system • Scope includes: • Power control into interferometers • Provide phase modulation of the input light • Electro-optic modulation • Routing optics, diagnostics (photodiodes, optical spectrum analyzers) • Filter spatially and temporally the light into the interferometer • transmission through the mode cleaner • Provide optical isolation as well as distribution of interferometer diagnostic signals • Faraday isolators • In vacuum non-suspended mirrors and optomechanical components • Mode match the light to the interferometer • beam-expanding telescope mirrors • CO2 laser and beam routing optics • Scope also includes labor and travel for IO fabrication, assembly and testing at sites • IO deliverables are met when all components are delivered to the site, assembled, tested, and past a ‘readiness’ check.

  3. SubsystemWork Breakdown Structure

  4. SubsystemDetailed Schedule • Detailed schedule is available on Project website • http://www.ligo.caltech.edu/~advligo/io/io_current_progsched.pdf

  5. SubsystemSchedule Highlights IO not on critical path

  6. DEVELOPMENT FABRICATION SubsystemMilestones

  7. Project SubsystemInterfaces • Management • design and fabrication by UF • Lots of experience from initial LIGO • Oversight by Carol Wilkinson, LIGO Lab • Lab reviews of Input Optics • Travel to NSF reviews, sites, Caltech, MIT (LASTI) • Optical • TO: Core Optics • IO Mirrors delivered to Core Optics for metrology • FROM: Core Optics • IO Mirrors delivered from Core Optics after metrology • Mechanical • FROM: Suspensions • SUS designs and fabricates suspension and delivers to IO for assembly • Electronic • FROM: ISC • ISC provides RF signals to modulators • ISC provides power control software • Mode cleaner length and alignment servo designed and built by ISC • ISC fabricated symmetric port (REFL) beam stabilization servo • ISC fabricates servo for adaptive mode matching (if needed) • ISC fabricates servo for active jitter suppression into mode cleaner (if needed)

  8. Subsystem Cost Estimating • Used cost estimating approach based on initial LIGO • Capital equipment and M&S • Catalog prices for ‘off-the-shelf’ optical, mechanical, and diagnostic components • Vendors: CVI Laser, New Focus, Newport, … • Vendor quotes for specialized components • Suspended mirrors, beam routing (super)mirrors • Vendors: Corning (blanks) • Subcontracts: General Optics (polishing), REO (optical coatings), IAP (Faraday rotator), Raicol (modulator crystals) • Engineering estimates for UF ‘home-built’ opto-mechanics and electronics • Escalated from LIGO 1 experience • Labor rates • Hours estimated based on LIGO 1 experience and extrapolated complexity to Advanced LIGO • e. g. – 800 hrs/IFO to assemble and test mode cleaner and MMT suspensions before installation as opposed to 400 hrs in LIGO 1  triple suspension more complex • Travel • Estimated based on LIGO 1 experience and extrapolated complexity to Advanced LIGO

  9. Subsystem Cost by WBS Level 4

  10. Subsystem Staffing Profile

  11. Major Safety Issues for the Input Optics • High laser power  180 W from laser • Overall Strategy: Project wide laser safety plan in place for LIGO Laboratory • under modification for Advanced LIGO • Handling and transport of heavy components • e.g., Assembled mode cleaner triple suspensions • Mitigation: design robust ergonomic assembly and transportation tooling

  12. Subsystem Risks and Concerns • Cost and Schedule risk: Damage to IO components during processing, metrology, and assembly • Spares built into procurement processing • Laser damage mitigated by LIGO Laser Safety Plan • Schedule risk: Adaptive MMT optically complex and not prototyped at system (eg, LASTI) level • Added value, but not essential to AdvLIGO • Accelerate design; pursuing alternatives (ring heaters for MMT mirrors • Schedule risk: Faraday isolator doesn’t meet vacuum requirements • Alternative vendors (Electro-optic Technologies)

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