Plasma processes inside dispenser hollow cathodes
Plasma processes inside dispenser hollow cathodes
复制标题
分配器空心阴极内的等离子体处理
DOI：
10.1063/1.2208292
复制
发表时间：
2006
影响因子：
2.2
通讯作者：
K. Jameson
中科院分区：
文献类型：
--
作者：
I. Mikellides;I. Katz;D. Goebel;J. Polk;K. Jameson
一个二维流体模型的等离子体和中性气体内分配器镶嵌空心阴极已被开发，以量化等离子体过程，最终确定在这些设备中插入的多孔发射器的寿命。该模型自洽占电子发射从插入以及从等离子体的电子和离子通量损失。两个阴极，这是明显不同的尺寸和操作条件，进行了数值模拟。据发现，较大的阴极，与外管直径为1.5cm和孔直径为0.3cm，建立一个有效的发射区，跨越约全长的发射器时，在放电电流为25A，流量为5.5sccm。发射器的净加热是由离子引起的，离子是由管内中性气体的电离产生的，然后被沿着发射器的鞘层加速。外径0.635cm、孔径0.1cm的小阴极，其性能优于普通阴极。
A two-dimensional fluid model of the plasma and neutral gas inside dispenser orificed hollow cathodes has been developed to quantify plasma processes that ultimately determine the life of the porous emitters inserted in these devices. The model self-consistently accounts for electron emission from the insert as well as for electron and ion flux losses from the plasma. Two cathodes, which are distinctively different in size and operating conditions, have been simulated numerically. It is found that the larger cathode, with outer tube diameter of 1.5cm and orifice diameter of 0.3cm, establishes an effective emission zone that spans approximately the full length of the emitter when operated at a discharge current of 25A and a flow rate of 5.5sccm. The net heating of the emitter is caused by ions that are produced by ionization of the neutral gas inside the tube and are then accelerated by the sheath along the emitter. The smaller cathode, with an outer diameter of 0.635cm and an orifice diameter of 0.1cm, do...