Fast, hot electron production and ion acceleration in a helicon inductive plasma
Fast, hot electron production and ion acceleration in a helicon inductive plasma
复制标题
螺旋感应等离子体中快速产生热电子和离子加速
DOI：
10.1063/1.4962758
复制
发表时间：
2016
影响因子：
2.2
通讯作者：
J. Scharer
中科院分区：
文献类型：
--
作者：
Y. Sung;Y. Li;J. Scharer
在麦迪逊螺旋实验中，在磁膨胀区观察到一个大的、时间平均的、双层状等离子体电位下降80 V，超过几百个德拜长度。在无碰撞状态下，它在900w和低氩气工作压力（0.12-0.20 mTorr）下的感应模式下工作。等离子体空间电位下降是由于在磁膨胀区形成双层结构造成的，远高于玻尔兹曼膨胀引起的电位下降。随着等离子体电位的下降，在电位下降区域的下游，在较低的压力下，观察到一个局部负电位的离子空穴区域，其电子密度高于离子密度。通过RF补偿Langmuir探针和光学发射光谱（OES）诊断，在双层上游观察到具有热（Te≈15 eV）和体（Te≈5 eV）分量的双温麦克斯韦电子分布。在楼下的膨胀室里……
A large, time-averaged, double layer-like plasma potential drop of 80 V over several hundred Debye lengths has been observed in the magnetic expansion region on the Madison Helicon eXperiment. It is operated in an inductive mode at 900 W and low argon operating pressures (0.12–0.20 mTorr) in the collisionless regime. The plasma space potential drop is due to the formation of a double layer-like structure in the magnetic expansion region and is much higher than the potential drop caused by a Boltzmann expansion. With the plasma potential drop, a locally negative potential ion hole region at lower pressures with a higher electron density than ion density has been observed just the downstream of the potential drop region. Two-temperature Maxwellian electron distributions with a warm ( Te≈15 eV) and bulk ( Te≈5 eV) components are observed just upstream of the double layer validated through a RF compensated Langmuir probe and an optical emission spectroscopy (OES) diagnostics. In the expansion chamber downstre...