Input Optics (IO)

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Input Optics (IO)

• Cost and Schedule Breakout Presentation
• NSF Review of Advanced LIGO Project

David Reitze UF
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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.

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Subsystem Work Breakdown Structure
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Subsystem Detailed Schedule

• Detailed schedule is available on Project website
  
• http//www.ligo.caltech.edu/advligo/io/io_current
  _progsched.pdf

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Subsystem Schedule Highlights
IO not on critical path
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Subsystem Milestones
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Project Subsystem Interfaces

• 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

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Subsystem Cost Estimating

• Used cost estimating approach based on initial
  LIGO
• Capital equipment and MS
• 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

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Subsystem Cost by WBS Level 4
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Subsystem Staffing Profile
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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

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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 doesnt meet
  vacuum requirements
• Alternative vendors (Electro-optic Technologies)