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Interferometer Sensing and Control (ISC)

This presentation provides a breakdown of the cost and schedule for the Interferometer Sensing and Control (ISC) system, which includes hardware and software for sensing and controlling the interferometer length, RF detectors, signal conditioning electronics, real-time processing and networking, and more. Safety practices and risks are also addressed.

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Interferometer Sensing and Control (ISC)

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  1. Interferometer Sensing and Control (ISC) Cost and Schedule Breakout Presentation NSF Review of Advanced LIGO Project Richard Abbott CIT

  2. 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)

  3. 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

  4. ISC Work Breakdown Structure (WBS Dictionary Available athttp://www.ligo.caltech.edu/~advligo/isc/isc_current_wbs.pdf)

  5. ISC Cost by WBS

  6. ISC Schedule Highlights

  7. ISC Staffing Profile

  8. ISC Major Milestones

  9. 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

  10. 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

  11. 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

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