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Title: Analysis based on global model of nitrogen plasma produced by pulsed microwave at low pressure

This paper analyzes certain evolution processes in nitrogen plasmas discharged using pulsed microwaves at low pressure. Comparing the results obtained from the global model incorporating diffusion and the microwave transmission method, the temporal variation of the electron density is analyzed. With a discharge pressure of 300 Pa, the results obtained from experiments and the global model calculation show that when the discharge begins the electron density in the plasma rises quickly, to a level above the critical density corresponding to the discharge microwave frequency, but falls slowly when the discharge microwave pulse is turned off. The results from the global model also show that the electron temperature increases rapidly to a peak, then decays after the electron density reaches the critical density, and finally decreases quickly to room temperature when the discharge microwave pulse is turned off. In the global model, the electron density increases because the high electron temperature induces a high ionization rate. The decay of the electron density mainly comes from diffusion effect.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [1]
  1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)
  2. (China)
  3. Science and Technology on High Power Microwave Laboratory, Institute of Applied Electronics. CAEP, P.O. Box 919-1015, Mianyang 621900 (China)
Publication Date:
OSTI Identifier:
22490991
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIFFUSION; ELECTRON DENSITY; ELECTRON TEMPERATURE; MICROWAVE RADIATION; NITROGEN; PLASMA; PRESSURE RANGE KILO PA; PULSES; TEMPERATURE RANGE 0273-0400 K; TIME DEPENDENCE