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论文类型：期刊论文

发表时间：2016-12-01

发表刊物：PHYSICS OF PLASMAS

收录刊物：SCIE、EI、Scopus

卷号：23

期号：12

ISSN号：1070-664X

摘要：In this article, we have described a radio-frequency (RF) inductively coupled H-2 plasma using a hybrid computational model, incorporating the Maxwell equations and the linear part of the electron Boltzmann equation into global model equations. This report focuses on the effects of RF frequency, gas pressure, and coil current on the spatial profiles of the induced electric field and plasma absorption power density. The plasma parameters, i.e., plasma density, electron temperature, density of negative ion, electronegativity, densities of neutral species, and dissociation degree of H2, as a function of absorption power, are evaluated at different gas pressures. The simulation results show that the utilization efficiency of the RF source characterized by the coupling efficiency of the RF electric field and power to the plasma can be significantly improved at the low RF frequency, gas pressure, and coil current, due to a low plasma density in these cases. The densities of vibrational states of H-2 first rapidly increase with increasing absorption power and then tend to saturate. This is because the rapidly increased dissociation degree of H-2 with increasing absorption power somewhat suppresses the increase of the vibrational states of H-2, thus inhibiting the increase of the H-. The effects of absorption power on the utilization efficiency of the RF source and the production of the vibrational states of H2 should be considered when setting a value of the coil current. To validate the model simulations, the calculated electron density and temperature are compared with experimental measurements, and a reasonable agreement is achieved. Published by AIP Publishing.