Featured Paper by C. Del Vecchio, G. Agapito, L. Carbonaro, F. Marignetti, E. De Santis & Y. Coia
VRALA is the ideal candidate as an Adaptive Optics actuator at visible wavelengths. Its electric characteristics variations, suitable current commands, and an effective magnetic circuit geometry provide a 2 kHz correction bandwidth and a 25 mm actuator density. The magnetic core allows unprecedented performances with a negligible thermal impact. Pre-shaping the coil currents greatly simplifies the control system. Equipped with an inductance measure circuit, the current generator also provides the control system with an accurate feed-back signal. COMSOL's non-linear model allows to define the optimized geometry, to compute the dynamic response to the closed-loop control system, and to calculate the circuit inductance. The tests performed on a preliminary prototype, match the design results in terms of power and force.
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