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

FRC等离子体电子的加热和强脉冲离子束限制的改善

基本信息

批准号：
06452423
负责人：
OHI Shoichi
金额：
$ 1.22万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452423/
关键词：
FRC plasma FRC plasma formation device FRC plasma confinement FRC plasma transport plasma heating pulsed ion beam magnetically insulated ion beam FRCプラズマ加熱

项目摘要

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

对FRC等离子体输运的理论和实验研究揭示了等离子体粒子和俘获磁通的约束标度，表明粒子和俘获磁通的输运机制是经典的，粒子的衰减时间（τ_N）为f（α）·τ_c/{l+1.2 × 10^3·τ ^<-2.7>}，其中τ_c是一维径向MHD经典磁通衰减的特征时间（μ·r_s^2/4·eta_<cla.>，μ：磁导率，eta_<cla.>：Spitzer电阻率），τ_N是等离子体的纵横比（=l_s/2r_s，1：r_s等离子体半径，l_s：等离子体长度）。捕获通量的衰减时间<phi>为α·tau_N，当α = 1时，f（α）值约为0.3。第一个是等离子体的形成尽可能高的值，以确认其依赖于等离子体的几何形状。第二种是等离子体电子通过轴向注入磁场加热到经典输运的基本特征 ...更多信息一种绝缘的、电极几何聚焦的、几十NW的脉冲强离子束（-50keV，-kA，* 10 μ s），其中离子二极管已在建设中，本项目期间建成了直径22 cm，长150 cm，最大外场8 kG，上升场1.6 μ s的箍缩线圈等离子体发生装置，在该装置上形成的FRC等离子体的r_s= 9 cm，l_s=100- 120 cm（λ = 11 -14）。其τ_N值为0.37-0.48·f·τ_c（Te= 100 eV，α =1时为130- 170 μ s）。该装置即将投入运行，利用二维压力平衡计算和一维等离子体输运模拟相结合的FRC分布，对上述尺寸的氢等离子体进行了50 keV质子轴向注入加热等离子体的效率的数值估算。当Te= 50 eV时，等离子体的加热效率约为30%，当Te= 100 eV时，等离子体的加热效率约为10%。少