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CHOI, Il Woo
초강력 레이저과학 연구단
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Generation of energetic ions with non-Maxwellian energy distribution from a double-layer target irradiated by an ultra-intense laser pulse

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Title
Generation of energetic ions with non-Maxwellian energy distribution from a double-layer target irradiated by an ultra-intense laser pulse
Author(s)
Kim, Ha-Na; Lee, Kitae; Kumar, Manoj; Ryu, Woo-Je; Cuong Nhat Le; Jeong, Young Uk; Kim, Kyung Nam; Park, Seong Hee; Jeon, Min Yong; Il Woo Choi; Seong Geun Lee; Seung Woo Kang; Sang Hwa Lee; Cheonha Jeon; Yong Ha Jang; Hwang Woon Lee; Jin Woo Yoon; Jae Hee Sung; Seong Ku Lee; Chang Hee Nam
Publication Date
2022-09
Journal
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.81, no.5, pp.391 - 396
Publisher
KOREAN PHYSICAL SOC
Abstract
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 different 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 x 10(20) W/cm(2) 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 field 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.
URI
https://pr.ibs.re.kr/handle/8788114/12367
DOI
10.1007/s40042-022-00535-6
ISSN
0374-4884
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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