The Performance Of Arm Locking In The Laser Interferometer Space Antenna

Details The Performance Of Arm Locking In The Laser Interferometer Space Antenna The Performance Of Arm Locking In The Laser Interferometer Space Antenna

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21548211m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #482.11; Bulletin of the American Astronomical Society, Vol. 42, p.575

Computer Science

Performance

Scientific paper

For the laser interferometer space antenna (LISA) to reach its design sensitivity, the coupling of the free running laser frequency noise to the signal readout must be reduced by more than 14 orders of magnitude. The current LISA baseline design has three stages of frequency noise reduction: pre-stabilization to an optical cavity; stabilization to the LISA arms (arm locking); and cancellation in post processing by time delay interferometry (TDI). One challenging aspect of arm locking is maintaining control system stability in the presence of the 33 second light travel time of a LISA arm round trip.
We provide results from a detailed study of arm locking implementation on LISA that includes:
*Orbital effects (changing arm lengths and Doppler shifts)
*A comparison of control system architectures (how to best combine the phase measurements)
*A study of the significant noise sources, ultra-stable oscillator (clock) noise, spacecraft motion, and shot noise.
We arrive at a detailed design of the control system and provide a high fidelity analysis of the expected performance. We explain the dependence of the arm locking sensor phase delay on the open loop gain of the control system. Exploiting this effect yields 10 times more noise suppression in the LISA science band (100uHz - 1Hz). We also propose a modification to the dual arm locking sensor to minimize low-frequency noise coupling.
We find that the performance of arm locking is sufficient for the LISA sensitivity to be realized with arm locking and TDI only, without any form of pre-stabilization.

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