title: High-efficiency γ-ray flash generation via multiple-laser scattering in ponderomotive potential well.
abstract: γ-ray flash generation in near-critical-density target irradiated by four symmetrical colliding laser pulses is numerically investigated. With peak intensities about 10^{23} W/cm^{2}, the laser pulses boost electron energy through direct laser acceleration, while pushing them inward with the ponderomotive force. After backscattering with counterpropagating laser, the accelerated electron is trapped in the electromagnetic standing waves or the ponderomotive potential well created by the coherent overlapping of the laser pulses, and emits γ-ray photons in a multiple-laser-scattering regime, where electrons act as a medium transferring energy from the laser to γ rays in the ponderomotive potential valley.
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
authors.forename: Z
authors.initials: Z
authors.lastname: Gong
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
authors.forename: R H
authors.initials: RH
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
authors.forename: Y R
authors.initials: YR
authors.lastname: Shou
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
authors.forename: B
authors.initials: B
authors.lastname: Qiao
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
authors.forename: C E
authors.initials: CE
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.
authors.forename: X T
authors.initials: XT
authors.lastname: He
authors.affiliation: Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: S S
authors.initials: SS
authors.lastname: Bulanov
authors.affiliation: QuBS, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215, Japan.
authors.forename: T Zh
authors.initials: TZ
authors.lastname: Esirkepov
authors.affiliation: QuBS, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215, Japan.|A. M. Prokhorov Institute of General Physics RAS, Moscow 119991, Russia.
authors.forename: S V
authors.initials: SV
authors.lastname: Bulanov
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Yan