Interferometer Sensing and Control (ISC)

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Interferometer Sensing and Control (ISC)

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

Richard Abbott CIT
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ISC Description Deliverables

• At a Total Cost of 8.04M, the ISC system
  provides the hardware and software for
• Sensing and controlling interferometer length
• Radio Frequency (RF) detectors 4.1 (272k)
• RF Readout Chain 4.2 (184k)
• RF Signal Source 4.3.4 (162k)
• ISC Signal Conditioning Electronics 4.3.2 (335k)
• Real-time Processing Networking 4.3.1 (479k)
• ISC Analog-to-digital Converters (ADCs) 4.3.3
  (661k)
• Real-time Software 4.4 (433k)
• Diagnostic and Supervisory Software 4.5 (319k)
• Seismic Platform Interferometer 4.9 (580k)
• Optical Alignment systems
• Alignment Sensing Control (ASC) detectors
  (515k)
• ASC RF Demodulation 4.3.5 (200k)
• Video Monitoring System 4.6.2 (403k)

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ISC Description Deliverables (cont.)

• Readout signals used to search for gravity waves
• DC Readout detectors (144k)
• ISC Sensing Tables 4.6.3 (1.336M)
• Output Mode Cleaner 4.7.1 (306k)
• Reconfiguring parts of the vacuum envelope
  (743k)
• Vacuum Detection Infrastructure 4.8 (743k)
• Fabrication Testing and Validation 4.7 (497k)
• ISC Management 1 (472k)
• In Process Spares included in deliverable costing

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ISC Work Breakdown Structure (WBS Dictionary
Available at http//www.ligo.caltech.edu/advligo/
isc/isc_current_wbs.pdf)
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ISC Cost by WBS
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ISC Schedule Highlights
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ISC Staffing Profile
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ISC Major Milestones
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Subsystem Cost Estimating Basis

• Cost estimating reliant on extrapolation from
  initial LIGO experiences due to custom nature of
  electronics
• Wherever possible, representative quotes taken
  from industry
• PCB manufacturing facilities (PCB Express)
• Circuit board stuffing (Screaming Circuits)
• Huntington Vacuum etc. for standard vacuum parts
• Accuglass Vacuum connections
• Estimates for LIGO designed electronics based on
  repackaging of existing designs wherever
  applicable
• Travel
• Estimated based on LIGO 1 experience and
  extrapolated to Advanced LIGO complexity

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ISC Risks and Concerns

• Staffing availability
• Schedule assumes personnel familiar with LIGO
  designs
• Possible mitigation in improved standards for
  documentation and written processes
• Training of personnel to expand their roles
• Use of outside testing facilities
• Quality Control
• Historically, this is a point of weakness
• Efforts to mitigate include
• Better test procedures
• Use of unbiased outside testing facilities
• Better peer review process

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Safety Practices

• Laser Safety
• Laser safety practices will be in accordance with
  standing approved LIGO laser safety practices
• Electrical Safety
• Systems with hazardous electrical voltages such
  as photo-diode bias supplies will be designed and
  used in accordance with approved LIGO electrical
  standards and procedures