The quaternary mirror (M4) of the Ex- tremely Large Telescope will be equipped with an Adaptive Optics Unit, in order to compensate the effects of the atmospheric turbulence. The highly accurate, closed loop actuation of the thin mirror is provided by 5316 contactless actuators. Their core is a voice-coil device, whose magnetic design exploits the concept adopted in all previ- ous units. As some implementation details were changed to deal with the challenges im- posed by the performances of the M4 unit, in the present paper we discuss the opti- mization design of the magnetic circuit car- ried out by means of Comsol, as well as the possible, future study of the dynamic magneto-mechanical behaviour when oper- ating in open and closed loop.
ELT M4 Adaptive Mirror Actuator: Magnetic Optimization and Future Developments
S. Barmada;L. Sani;
2018-01-01
Abstract
The quaternary mirror (M4) of the Ex- tremely Large Telescope will be equipped with an Adaptive Optics Unit, in order to compensate the effects of the atmospheric turbulence. The highly accurate, closed loop actuation of the thin mirror is provided by 5316 contactless actuators. Their core is a voice-coil device, whose magnetic design exploits the concept adopted in all previ- ous units. As some implementation details were changed to deal with the challenges im- posed by the performances of the M4 unit, in the present paper we discuss the opti- mization design of the magnetic circuit car- ried out by means of Comsol, as well as the possible, future study of the dynamic magneto-mechanical behaviour when oper- ating in open and closed loop.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
