射频电感耦合夹层等离子体中的模式转换

本文利用微波相位法和光谱诊断法, 研究了ICP放电等离子体在圆台状夹层等离子体中E模和H模相互转换的物理现象. E模和H模的之间转换过程是一个瞬间突变的, 转换点的输入功率随真空室压强的变化而变化. H模向E模转换的阈值功率低于E模向H模转换的值, 等离子体参数随输入功率变化曲线类似于铁磁物质中的磁滞回线. Ar II 408.2 nm谱线的强度的变化规律和电子密度随功率变化的规律基本一致. 通过本实验可以获得一种电子密度范围为3.85×10¹¹ cm^-3 < n_e < 4.68× 10¹¹ cm^-3, 外表面积为0.3 m², 厚度为2 cm稳定工作的等离子体源.

Mode transition of inductively coupled plasma in interlayer chamber

We do some research on E-H mode transition of inductively coupled plasma (ICP) in the interlayer chamber, using the microwave phase and plasma spectrum diagnotic technique. The mode transition between E and H mode is a sudden changes phenomenon. The input power of the transition varies as the pressure changes in the chamber. The transition power from H to E is less than from E to H, so the hysteresis in power hence is established. The change of the relative spectral intensity is basically the same the variation of the electron density with input power. We obtain a stable plasma source, with an electron density ranging from 3.85× 10¹¹ cm^-3 to 4.68× 10¹¹ cm^-3, an outer surface area of 0.3 m², and a thickness of 2 cm.