Peano F, Peinetti F, Mulas R, Coppa G, Silva L O
Dipartimento di Energetica, Politecnico di Torino, Italy.
Phys Rev Lett. 2006 May 5;96(17):175002. doi: 10.1103/PhysRevLett.96.175002. Epub 2006 May 3.
The collisionless expansion of spherical plasmas composed of cold ions and hot electrons is analyzed using a novel kinetic model, with special emphasis on the influence of the electron dynamics. Simple, general laws are found, relating the relevant expansion features to the initial conditions of the plasma, determined from a single dimensionless parameter. A transition is identified in the behavior of the ion energy spectrum, which is monotonic only for high electron temperatures, otherwise exhibiting a local peak far from the cutoff energy.
利用一种新型动力学模型分析了由冷离子和热电子组成的球形等离子体的无碰撞膨胀，特别强调了电子动力学的影响。发现了简单的一般规律，将相关的膨胀特征与等离子体的初始条件联系起来，初始条件由一个无量纲参数确定。在离子能谱的行为中识别出一个转变，该转变仅在高电子温度下是单调的，否则在远离截止能量处会出现一个局部峰值。
