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Kim Ha-Na,Lee Kitae,Kumar Manoj,Ryu Woo-Je,Le Cuong Nhat,Jeong Young Uk,Kim Kyung Nam,Park Seong Hee,Jeon Min Yong,Choi Il Woo,Lee Seong Geun,Kang Seung Woo,Lee Sang Hwa,Jeon Cheonha,Jang Yong Ha,Lee 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.5
Carbon ions and protons from a double-layer target, a copper foil coated with a polymer exhibit non-Maxwellian spectral shapes, when an ultra-intense laser pulse with a high temporal contrast ratio was focused on the metal side of the target. The spectral shapes, showing strong reduction of low-energy ions, a high-energy island, and a modulated structure, are diferent from a typical thermal distribution usually obtained from a pure metal target in the laser acceleration of ions. In the case of C6+ ion, a high-energy island with an energy spread of 0.5 MeV/u was observed, which is separated from the low-energy spectrum by 0.2 MeV/u. A modulation in the proton energy spectrum was observed, which leads to a secondary peak at 2.2 MeV/u in addition to a peak at a low energy of 1.5 MeV/u. The maximum energy obtained from the double-layer target at a laser intensity of 3 × 1020 W/cm2 is 3.4 MeV/u for C6+ ions and 10 MeV/u for protons, which are higher than those obtained from a single metal foil by factors of 1.7 and 1.3, respectively. Such a spectral shape and energy enhancement could be accounted for by a bulk electrostatic feld formed at the metal-polymer interface and multi-species interactions. These results show that the spectral shape of the ion beam can be tailored with an adequate structure of micrometer-thick target.
Shin, Junghun,Kim, Hyung Taek,Pathak, V B,Hojbota, Calin,Lee, Seong Ku,Sung, Jae Hee,Lee, Hwang Woon,Yoon, Jin Woo,Jeon, Cheonha,Nakajima, Kazuhisa,Sylla, F,Lifschitz, A,Guillaume, E,Thaury, C,Malka, IOP 2018 Plasma physics and controlled fusion Vol.60 No.6
<P>Generation of high-quality electron beams from laser wakefield acceleration requires optimization of initial experimental parameters. We present here the dependence of accelerated electron beams on the temporal profile of a driving PW laser, the density, and length of an interacting medium. We have optimized the initial parameters to obtain 2.8 GeV quasi-monoenergetic electrons which can be applied further to the development of compact electron accelerators and radiations sources.</P>