Feedback Cooling of the Normal Modes of a Massive Electromechanical System to Submillikelvin Temperature
Feedback Cooling of the Normal Modes of a Massive Electromechanical System to Submillikelvin Temperature
We apply a feedback cooling technique to simultaneously cool the three electromechanical normal modes of the ton-scale resonant-bar gravitational wave detector AURIGA. The measuring system is based on a dc superconducting quantum interference device (SQUID) amplifier, and the feedback cooling is applied electronically to the input circuit of the SQUID. …