### 抜粋

A plasma expansion into vacuum and the resultant ion acceleration are studied analytically and numerically. The expansion of an initially uniform spherical plasma (consisting of a nanocluster or microdroplet) with radius R_{u0} and electron density n_{u0} is driven by the explosion of hot electrons having an initial temperature T_{e0}. A self-similar solution describes the nonrelativistic expansion of a finite plasma mass with a full account of charge separation effects. Such key features as the energy spectrum, maximum ion energy, and energy transfer efficiency from the electrons to the ions are given by simple analytic formulas as a function of the normalized droplet radius, Λ_{u}= R_{u0} λ_{D}, where λ_{D} = T_{e0} 4πn _{u0}e^{2} is the Debye length. The solution predicts that impurity ions doped homogeneously in a droplet plasma are accelerated quasimonoenergetically by the electrostatic field generated by the charge separation. The prediction is confirmed by N-body particle simulations. The origin of the monoenergetic spectrum is attributed to the spherical geometry.

元の言語 | 英語 |
---|---|

記事番号 | 082702 |

ジャーナル | Physics of Plasmas |

巻 | 15 |

発行部数 | 8 |

DOI | |

出版物ステータス | 出版済み - 9 8 2008 |

### フィンガープリント

### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics

### これを引用

*Physics of Plasmas*,

*15*(8), [082702]. https://doi.org/10.1063/1.2965147