Heating of FRC plasma electron and improvement of confinement by intense pulsed ion beam

对FRC等离子体传输揭示的等离子体颗粒的置信度和被困磁通量的理论和实验调查，其中表明粒子和被困通量的传输机制是经典的和粒子（tau_N）的衰减时间是f （alpha）·tau_c/{l+1.2 x10 ^3·epsilon^&lt;-2.7&gt;}其中tau_c是1-D（径向） MHD经典通量衰减（mu·r_s ^2/4·eta_<cla.>， mu ： permeability和eta_<cla.>： Spitzer's resistability）的特征时间，epsilon是等离子体方面比（= l_s/2 r_s， ：r_s等离子体半径和l_s： its length）。被困通量（tau_）的衰变时间<phi>是alpha，tau_N，f （alpha）的值大约是0.3，有两种方法被提议以验证缩放法。“第一个是由具有高价值的epsilon形成的，有可能确认其对等离子体几何的依赖。”第二个是等离子体电子加热到其经典传输的基本特征，由磁性的轴向注入 ... More 被绝缘的、电几何聚焦的、脉冲的密集离子束的10个NW（-50 keV，-kA，和 * 10 mus），是一个在构造下的离子二极管，在这个项目的期限内，构造了一个等离子体产生装置，直径为22厘米，长度为150厘米，最大范围为8千G，上升为1.6 mus，在任何可能是r_s = 9厘米和l_s =100- 120厘米的FRC等离子体上的设备上。Its value of tau_N corresponded to 0.37-0.48·f·tau_c（130- 170 mus for Te= 100 eV and alpha=1）。该装置将很快投入运行，通过50 keV质子的轴向注入加热等离子体的效率已被估计为数值上的氢等离子体在尺寸上使用FRC的一个更激进的现实性剖面图，该装置是根据2-D压力equilibrium计算与1-D等离子体传输模拟组合而成的。在分离器中加热等离子体的效率是30%，Te= 50 eV约10%，脉冲光束的值可能足以使等离子体明显地受到脉冲光束的影响。Less（低）

A theoretical and experimental investigation on FRC plasma transport revealed a confinement scaling of plasma particle and trapped magnetic flux which indicated that the transport mechanism of particle and trapped flux was classical and the decay time time of particle (tau_N) was f (alpha)・tau_c/{l+1.2x10^3・epsilon^<-2.7>}, where tau_c was a characteristic time of 1-D (radial) MHD classical the flux-decay (mu・r_s^2/4・eta_<cla.>, mu : permeability and eta_<cla.> : Spitzer's resistivity) and epsilon was a plasma aspect ratio (=l_s/2r_s, : r_s plasma radius and l_s : its length). The decay time of trapped flux (tau_<phi>) was alpha・tau_N and a value of f (alpha) was around 0.3 for alpha=1.Two methods were proposed in order to verify the scaling law. The first was the plasm formation of as high value of epsilon as possible to confirm its dependence on plasma geometry. The second was plasma electron heating to its basic feature of the classical transport by the axial injection of a magnetic … More ally insulated, electrode-geometrically focused, and pulsed intense ion beam of several ten NW (-50keV,-kA,and * 10mus), an ion diode of which had been under construction.During the term of this project, constructed was a plasma generation device with a pinch coil of 22cm in diameter and 150cm in length and with extenal field of 8kG at the maximum and of 1.6mus in rising, on the device of which formed might be an FRC plasma of r_s=9cm and l_s=100-120cm (epsilon=ll-14). Its value of tau_N corresponded to 0.37-0.48・f・tau_c (130-170mus for Te=100eV and alpha=1). The device was coming to operate soon.An efficiency of heating plasma by the axial injection of the 50keV proton was estimated numerically for the hydrogen plasma of a dimension shown above using a rather realistic profile of FRC,which was deduced from a 2-D pressure equilibrium calculation combined with the 1-D plasma transport simulation. The efficiency o heat the plasma inside the separatrix was 30% for Te=50eV and about 10% for Te=100eV.This value might be enough to the plasma significantly by the pulsed ion beam. Less