PIC/MCC Simulation of Radio Frequency Hollow Cathode Discharge in Nitrogen

Abstract

A two-dimensional PIC/MCC model is developed to simulate the nitrogen radio frequency hollow cathode discharge (rf-HCD). It is found that both the sheath oscillation heating and the secondary electron heating together play a role to maintain the rf-HCD under the simulated conditions. The mean energy of ions (N + 2 , N +) in the negative glow region is greater than the thermal kinetic energy of the molecular gas (N2), which is an important characteristic of rf-HCD. During the negative portion of the hollow electrode voltage cycle, electrons mainly follow pendulum movement and produce a large number of ionization collisions in the plasma region. During the positive voltage of the rf cycle, the axial electric field becomes stronger and its direction is pointing to the anode (substrate), therefore the ions move toward the anode (substrate) via the axial electric field acceleration. Compared with dc-HCD, rf-HCD is more suitable for serving as a plasma jet nozzle at low pressure.

Microstructure and Deuterium Retention of Tungsten Deposited by Hollow Cathode Discharge in Deuterium Plasma

“…Since hollow cathode discharge (HCD) was first achieved by Paschen in 1916, it has attracted considerable attention in the field of low-temperature plasmas. [14] HCD is gas discharge between a cathode that contains a hollow structure and an arbitrarily shaped anode. [15] The mechanism of the hollow cathode effect is called 'pendulum electronic effect'.…”