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Title: Transition characteristics of low-pressure discharges in a hollow cathode

Based on a two-dimensional (2-D) fluid model, the transition processes of discharges in a hollow cathode at low pressure are observed by changing three parameters, i.e., applied voltage U 0, gas pressure p, and external circuit ballast resistance R b. The voltage-current characteristic curves, electron density distributions, and electric potential distributions of different discharge operating points in a hollow cathode are obtained. The transition processes are characterized by the voltage-current characteristic curves, the electron density distributions, and the electrical potential distributions. The transition modes observed from the voltage-current characteristics include the low-current abnormal mode, normal mode, and high-current abnormal mode. Increasing the applied voltage U0 can have a similar effect on the discharge transition processes to decreasing the ballast resistance. By increasing U0 from 200V to 500V and decreasing Rb from 5000 kX to 100 kX independently, it is observed that the discharge transfers from the outside to the inside of the hollow cavity, thus forming the virtual anode potential. By increasing the gas pressure p from 50 Pa to 5 kPa, the discharge also moves into the hollow cavity from the outside; however, a further increase in the gas pressure leads to the discharge escaping from the hollow cavity.more » Simulation results and characterizations for different parameters are presented for the transition properties of low-pressure discharges in a hollow cathode. It is verified that the hollow cathode discharge only exists under certain ranges of the above parameters.« less
Authors:
ORCiD logo [1] ;  [1] ;  [2] ; ORCiD logo [3]
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering; Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering, and Dept. of Mathematics
  3. Tsinghua Univ., Beijing (China). Dept. of Electrical Engineering
Publication Date:
Grant/Contract Number:
SC0001939
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
Plasma Science Center
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING
OSTI Identifier:
1474306
Alternate Identifier(s):
OSTI ID: 1374230