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Purpose of the upgrade

►Demonstration of the AdvLIGO interferometer technologies

Prototyping of AdvLIGO LSC

• Lock acquisition

  • "Prove AdvLIGO LSC actually works"

• Green laser locking

  • "Realize lock of the arms independently from the main beam"

  • "Achieve semi-deterministic lock & smooth handing off"

• Noise mechanisms / DC readout

  • "Discover and/or confirm by a model RSE specific noise couplings"

Tuned / Detuned RSE comparison

• "Address advantage and disadv. of the tuned/detuned configuration"
• "Demonstrate smooth transition"

RGC based digital control system

• "Demonstrate complicated LSC code on the connected multiple systems"
• "Establish rapid prototyping methods with simulated plants on the processors"

►To do anything useful to make the AdvLIGO easier / faster

DC&Dither technologies

• Offset lock and handoffs
• AF WFS technique
  • "Develop and characterize various new useful techniques"

Interferometer Diagnosis

• Cavity characterization using aux. laser injection
  • "Provide a method of precise in-situ characterization of the interferometer"

Development / test bench of advanced technologies

• GigE CCD WFS technique
• Adaptive noise cancellation
  • "Demonstrate how it works"
  • "Understand and improve its limitations"

Major things to be upgraded

Interferometer Configuration

CDS Interferometer Configuration