ISOTOPE SEPARATION IN SHEET PLASMA

磁化片状等离子体是指厚度几乎等于平均离子回旋半径Rho_i的两倍的磁化片状等离子体的一种特殊形式，为了满足d&lt；Rho_i条件，离子导引中心的每个位置都被限制在片状等离子体中面附近的全部区域d内。目前的目的是通过对片状等离子体施加射频电场来实现同位素分离，称为离子回旋共振(ICR)方法。虽然气体扩散法、离心法和喷嘴法等许多同位素分离方法是众所周知的，但这些方法得到的分离因子值很低。ICR方法和激光方法的分离因子值都很高。得到的结果如下：1)探针处的离子电流随外加射频频率的变化清楚地表明了共振现象。谐振处的射频频率与磁场强度成正比，与Ar、Ne和N的离子质量成反比。2)用ICR方法从含有氢和氢混合物的片状等离子体中分离出氚离子。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^+离子物种也可以从片状等离子体中分离出来。3)从片状等离子体的发射光谱中发现离子在等离子体中的温度为几个eV。4)用ICR方法分离片状等离子体中锂的同位素。

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.