title: Generating overcritical dense relativistic electron beams via self-matching resonance acceleration.
abstract: We show a novel self-matching resonance acceleration regime for generating dense relativistic electron beams by using ultraintense circularly polarized laser pulses in near-critical density plasmas. When the self-generated quasistatic axial magnetic field is strong enough to pinch and trap thermal relativistic electrons, an overdense electron bunch is formed in the center of the laser channel. In the trapping process, the electron betatron frequencies and phases can be adjusted automatically to match the resonance condition. The matched electrons are accelerated continuously and a collimated electron beam with overcritical density, helical structure, and plateau profile energy spectrum is hence generated.
authors.affiliation: Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: B
authors.initials: B
authors.lastname: Liu
authors.affiliation: Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: H Y
authors.initials: HY
authors.lastname: Wang
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, China.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, China.
authors.forename: L B
authors.initials: LB
authors.lastname: Fu
authors.affiliation: Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Xu
authors.affiliation: Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Yan
authors.affiliation: Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China and Institute of Applied Physics and Computational Mathematics, Beijing 100088, China.
authors.forename: X T
authors.initials: XT
authors.lastname: He