Evolution of a laser wake cavity in a MCF plasma.

Autor: Bierwage A; National Institutes for Quantum Science and Technology (QST), Rokkasho Institute for Fusion Energy, Rokkasho, Aomori, 039-3212, Japan. bierwage.andreas@qst.go.jp.; QST, Naka Institute for Fusion Science and Technology, Naka, Ibaraki, 311-0193, Japan. bierwage.andreas@qst.go.jp., Esirkepov TZ; QST, Kansai Institute for Photon Science (KPSI), Kizugawa, Kyoto, 619-0215, Japan., Koga JK; QST, Kansai Institute for Photon Science (KPSI), Kizugawa, Kyoto, 619-0215, Japan., Pirozhkov AS; QST, Kansai Institute for Photon Science (KPSI), Kizugawa, Kyoto, 619-0215, Japan., Aiba N; National Institutes for Quantum Science and Technology (QST), Rokkasho Institute for Fusion Energy, Rokkasho, Aomori, 039-3212, Japan.; QST, Naka Institute for Fusion Science and Technology, Naka, Ibaraki, 311-0193, Japan., Huang K; QST, Kansai Institute for Photon Science (KPSI), Kizugawa, Kyoto, 619-0215, Japan., Kando M; QST, Kansai Institute for Photon Science (KPSI), Kizugawa, Kyoto, 619-0215, Japan., Kiriyama H; QST, Kansai Institute for Photon Science (KPSI), Kizugawa, Kyoto, 619-0215, Japan., Matsuyama A; National Institutes for Quantum Science and Technology (QST), Rokkasho Institute for Fusion Energy, Rokkasho, Aomori, 039-3212, Japan.; Graduate School of Energy Science, Kyoto University, Uji, 611-0011, Japan., Shinohara K; QST, Naka Institute for Fusion Science and Technology, Naka, Ibaraki, 311-0193, Japan.; Department of Complexity Science and Engineering, The University of Tokyo, Kashiwa, Chiba, 277-8561, Japan., Yagi M; National Institutes for Quantum Science and Technology (QST), Rokkasho Institute for Fusion Energy, Rokkasho, Aomori, 039-3212, Japan., Yun GS; Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673, Republic of Korea.; Division of Advanced Nuclear Engineering, POSTECH, Pohang, Gyeongbuk, 37673, Republic of Korea.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Nov 13; Vol. 14 (1), pp. 27853. Date of Electronic Publication: 2024 Nov 13.
DOI: 10.1038/s41598-024-77739-2
Abstrakt: A laser pulse focused to relativistic intensity inside a magnetically confined fusion (MCF) plasma plows away all electrons in its path. The ensuing Coulomb explosion of the ions leaves behind a cavity of microscopic size, with gradients in the electric potential and plasma density orders of magnitude stronger than anything the plasma could generate spontaneously. When posing questions concerning the practical utility of such an exotic perturbation, the life time and structural evolution of the cavity are of interest. Our simulations in a simplified 1D + 2D setting and otherwise realistic parameters suggest that a sub-mm wide seed cavity (meant to resemble the laser wake channel) collapses or disintegrates within 10 ns. The dynamics are sensitive to the relative scales of the cavity, Debye shielding and gyration. We find evidence for the possibility that the collapsing seed cavity spawns solitary micro-cavities. It remains to be seen whether such structures form and survive long enough in a 3D setting to alter the local plasma conditions (e.g., as micro-cavity clusters) in ways that may be utilized for practical purposes such as plasma initiation, diagnostics or control.
Competing Interests: Declarations Competing interests The authors declare no competing interests.
(© 2024. The Author(s).)
Databáze: MEDLINE
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