ISOTOPE SEPARATION IN SHEET PLASMA

磁化板状等离子体定义为厚度几乎等于离子回旋半径平均2倍的磁化板状等离子体的特殊层，并且离子引导中心的每个位置被限制在板状等离子体中靠近中平面的一个小区域d内，以满足d<rho_i的条件。本文的目的是证明同位素分离是通过对片状等离子体施加射频电场进行的，称为离子回旋共振（ICR）方法。虽然许多同位素分离方法众所周知，如气体扩散法、离心法和喷嘴法，但这些方法的分离因子值都很低。预计ICR法和激光法的分离因子值都很高。所得结果如下：1)探针处获得的离子电流随外加射频频率的变化清晰地显示出谐振。谐振处的射频频率与磁场强度成正比，与氩、氖和氮的离子质量成反比。2)用ICR法从含有氘氢混合物的片状等离子体中分离氘离子。通过实验结果与计算结果的比较，可以看出HD分子产生的H_3D^+或D_2H^+的离子种类也可以与薄片等离子体分离。3)从等离子体的发射光谱中发现等离子体中离子的温度为几个eV。4)用ICR法分离等离子体中锂的同位素研究正在进行。

A magnetized sheet plasma is defined as the special one of a magnetized slab plasma whose thickness is nearly equal to two times of mean ion cyclotron radius, rho_i, and each position of guiding center of ions are limited to a amall region, d, near the mid plane in the sheet plasma so as to satisfy the d<rho_i condition. It is the present purpose to show that the isotope separation is carried out by the application of radio frequency electric field to the sheet plasma, called the ion cyclotron resonance (ICR) method. Although many methods of isotope separation, such as the gas diffusion methld, the centrifugal method and the nozzle method, were well-known, these methods gave only a low value of separation factor. The values of the separation factors for both the ICR method and the laser method are expected to be high. The obtained results are as follows ;1) The variation of obtained ion current at the probe with the applied rf frequency shows clearly the resonance. The rf frequency at the resonance is proportional to the strength of magnetic field and is proportional inversely to the ionic mass of argon, neon and nitrogen.2) The deuterium ion is separated from the sheet plasma containing the mixture of deuterium and hydrogen by ICR method. By the comparison of the experimental result with the calculated one, it is evident that the ionic species of H_3D^+ or D_2H^+ produced from the molecule HD are also separable from the sheet plasma.3)The temperature of ion in plasma is found to be several eV from the emission spectroscopy of the sheet plasma.4)The isotope separation of lithium in sheet plasma by ICR method under way.