The Proton and Alpha Sensor (PAS) for the Solar Orbiter Mission: motivations, design, operation principle and expected scientific return

Andrei Fedorov, IRAP, Toulouse, France, Philippe Louarn, IRAP, CNRS, Toulouse, France, Benoit Lavraud, IRAP/CNRS, Toulouse, France and H.C. Seran, C. Amoros, R. Baruah, R. Mathon, W. Marty, M.Petiot