地球磁层顶的漂移动力学Alfvn波不稳定性及其反常输运效应

本文用回旋动力学研究了磁层顶等离子体低频漂移动力学不稳定性.在β≥1附近发现两支不稳定的漂移动力学Alfvèn模(DKA).它们可在▽T(∥-▽n)(?)0时激发,速度剪切提供主要的自由能源.两支DKA均具有非零的(δE_y,δE_∥)和(δB_x,δB_∥).在湍动的非线性饱和状态下,δB_x的起伏可导致很强的反常输运,当|δB_x|=1nT时,D_⊥可达到10~9m^2/s的数量级.因此,DKA可能在太阳风-磁层耦合过程中起重要作用.

ROOM TEMPERATURE D-D FUSION REACTION RATE--A STRONG-COUPLING PLASMA MODEL

A strong-coupling plasma model with ion screening and electron polarization was used to study the room temperature D-D fusion reaction rate.By using the ground state harmonic-oscillator wave,function,we evaluated the nearest-neighbor penetration probability by WKB method.The D-D nuclear fusion re-action rate was calculated.The deuteron density is found to be crucial for the occurrence of fusion reaction while the temperature is much less important.

EXCITATION OF HIGH-N TOROIDAL SHEAR ALFVEN MODE DUE TO ALPHA-PARTICLE RIPPLE LOSSES IN TOKAMAKS\

The alpha-particle effects on high-n toroidal shear Alfven mode are investigated analytically.The mode can be driven to unstable when the alpha-particles have an anisotropic distribution function due to ripple losses in tokamaks.The growth rates of the instability in both“fast”and "slow"plasma heating cases are calculated,and the conditions for the excitation of the modes are also studied.

THE DRIFT CYCLOTRON LOSS-CONE INSTABILITIES IN AN INHOMOGENEOUS MAGNETIC FIELD

The effects of kinetic pole on drift cyclotron loss-cone instabzlzty are studied in detail,especially for the △B-drift resonance contribution.It is foimd that the kinetic resonance acts as dissipative effect which can enhance the instability and broaden the unstable region of negative energy DCLC mode.

AN ADVANCED CONCEPT FOR FUSION REACTOR DEVICE

Combining the merits of linear and toroidal confiprations with the fast and slow process concepts,we consider a fusion reactor concept consisting of two axisymmetric tandem mirrorlike sections and two heliac stellarator U-bends.The D-D reactor parameters are presented.The radio frequency(RF),energetic components and the plugs are needed only at the startup phase.These greatly cut down the coat and relax the technical requirements of engineering.

弱相对论捕获电子哨声模不稳定性

本文讨论了弱相对论的捕获电子在磁镜位形中对哨声波不稳定性的影响。在简化的箱子模型下,用摄动法求解了带有弱相对论捕获电子效应的本征方程。发现各向异性热电子可以驱动哨声模不稳定性,而相对论效应使不稳定性的各向异性阈值升高,增长率的最大值减小并使不稳定性向低频方向移动。

高β等离子体中低混杂漂移不稳定性

本文对高β等离子体中槽纹模低杂漂移不稳定性从迴旋动力论出发作了较系统的研究,考虑了密度梯度、电子的温度梯度以及磁场梯度漂移的共振效应,解析结果与数值计算取得了完全一致的结论。发现,当温度梯度方向与密度梯度方向相反时,与温度梯度有关的电子的磁漂移共振起不稳定作用,使模的增长率比温度均匀时明显增大;而当方向相同时,温度梯度效应加强电子磁漂移共振的稳定作用,减少模的增长率。在两种情形中随着β值的增大,模的增长率都会减小,而且最大增长率向长波方向移动。电子温度各向异性对模的性质没有影响。