A Few MeV Laser-Plasma Accelerated Proton Beam in Air Collimated Using Compact Permanent Quadrupole Magnets. - Brandi, Fernando; Labate, Luca; Palla, Daniele; Kumar, Sanjeev; Fulgentini, Lorenzo; Koester, Petra; Baffigi, Federica; Chiari, Massimo; Panetta, Daniele; Gizzi, Leonida Antonio (Applied Sciences (2076-3417), 2021)