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Isochoric heating of solid-density plasmas beyond keV temperature by fast thermal diffusion with relativistic picosecond laser light
| Title: | Isochoric heating of solid-density plasmas beyond keV temperature by fast thermal diffusion with relativistic picosecond laser light |
| Authors: | Higashi, Naoki Browse this author | | Iwata, Natsumi Browse this author | | Sano, Takayoshi Browse this author | | Mima, Kunioki Browse this author | | Sentoku, Yasuhiko Browse this author |
| Issue Date: | 9-May-2022 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review E |
| Volume: | 105 |
| Issue: | 5 |
| Start Page: | 55202 |
| Publisher DOI: | 10.1103/PhysRevE.105.055202 |
| Abstract: | The interaction of relativistic short-pulse lasers with matter produces fast electrons with over megaampere currents, which supposedly heats a solid target isochorically and forms a hot dense plasma. In a picosecond timescale, however, thermal diffusion from hot preformed plasma turns out to be the dominant process of isochoric heating. We describe a heating process, fast thermal diffusion, launched from the preformed plasma heated resistively by the fast electron current. We demonstrate the fast thermal diffusion in the keV range in a solid density plasma by a series of one-dimensional particle-in-cell simulations. A theoretical model of the fast thermal diffusion is developed and we derive the diffusion speed as a function of the laser amplitude and target density. Under continuous laser irradiation, the diffusion front propagates at a constant speed in uniform plasma. Our model can provide a guideline for fast isochoric heating using future kilojoule petawatt lasers. |
| Rights: | Copyright (2022) by The American Physical Society. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86145 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 東 直樹
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