Modulation of absorption manner in helicon discharges by changing profile of low axial magnetic field Project supported by the National Natural Science Foundation of China (Grant Nos. 11175024, 11375031, and 11505013), the Beijing Natural Science Foundation of China (Grant No. KZ201510015014), and the Beijing Municipal Natural Science Foundation, China (Grant No. 4162024). |
(color online) End-viewed ICCD images in Case 2 at different magnetic field Bex values when the working pressure is 0.35 Pa and RF power is 140 W. |