Automatic Alignment Control scheme for Advanced Virgo

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Presentation transcript:

Automatic Alignment Control scheme for Advanced Virgo M. Mantovani, for the ISC group M. Mantovani ISC meeting 13 Mar 2009

Alignment conceptual design Evaluation of Anderson vs. Ward technique MSRC: feasibility of noise evaluation due to high order modes NDRC: no extra d.o.f to control (there are no global error signals available) dynamic range is different due to different beam sizes and extra mirrors Steady state sensing configuration mod. freq., compatibility with quadrant freq. resp., error signals M. Mantovani ISC meeting 13 Mar 2009

Alignment conceptual design Steady state control configuration radiation pressure mitigation Noise performance coupling to DF, electronic noise Modulation Frequencies Compatibility with EM environmental noise Sidebands on sidebands: possible or not? radiation pressure definition of Sidles-Sigg modes M. Mantovani ISC meeting 13 Mar 2009

Alignment design specifications Beam/quadrant ports definition noise perf., DC powers Angular accuracy specification RMS, beam jitter, LC specs M. Mantovani ISC meeting 13 Mar 2009

Milestones & Concerns Single cavity alignment Man Power: VIR-109A-08 to be rechecked with the final optical parameters Man Power: At least a physicist or an engineer is needed full time M. Mantovani ISC meeting 13 Mar 2009

Concerns: Simulation tools: Optickle: Finesse: radiation pressure present (thus is the only one that can be used for the moment) any possibility to simulate static misalignment any possibility to evaluate the presence of offsets any possibility to evaluate the AA error signal linear region No yaw d.o.f. Finesse: no radiation pressure M. Mantovani ISC meeting 13 Mar 2009