High current magnetron type discharge in ExH fields for dense plasma generation
- High Current Electronics Institute, Tomsk (Russian Federation)
- Tomsk State Academy of Control System and Radioelectronics (Russian Federation)
Discharge in crossed magnetic and electric fields, operating in electrode system such as magnetron, attends interest because of possibility it offer to create a plasma with high azimuth uniform parameters. Because of the electron oscillation, the discharge operates stable with a high current mode at as low pressure as 10{sup -4} torr, affording a high degree of background gas ionization. There is also a stabilizing effect of magnetic field influence on discharge, which provided high value of the discharge current in the diffuse (without cathode spots) phase of discharge burning. It made possible for a cathode surface area of 300 cm{sup 2} and a pulse duration of 15 mks to obtain the maximum current in He of 1.5 kA. In a steady-state mode of operation the current was more the 10 A. Under these discharge currents a plasma density in the discharge unit was as much as 10{sup 13}-10{sup 11} cm{sup -3}. The value of electron temperature did not increase a few eV. The plasma parameters were obtained are rather suitable for plasma cathode annular beam electron and ion sources, but for the further extension of this discharge application in such field as, for example, pulse power high current electronics it requests at least the plasma density more then 10{sup 14} cm{sup -3}. Results of experiment, concerning an increase of magnetron discharge plasma density, are presented in this paper. An experimental setup schematic is presented on the fig.1. The magnetron discharge was ignited between two cylindrical shape electrodes of 45 mm length: cathode (d = 40 mm) and anode (d = 26 mm). Butt-end electrodes were under the cathode potential. There was a ring in the butt-end electrode for plasma expansion in a vacuum space. Magnetic fields of 0.05-0.1 T was created by colenoidal coil. A background gas pressure did not exceed 10{sup -2}-10{sup -1} torr. A discharge pulse duration was as short as 10 mks.
- OSTI ID:
- 212813
- Report Number(s):
- CONF-950749-; TRN: 96:009981
- Resource Relation:
- Conference: 22. international conference on phenomena in ionized gases, Hoboken, NJ (United States), 31 Jul - 4 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of XXII International conference on phenomena in ionized gases. Contributed papers 2; Becker, K.H.; Carr, W.E.; Kunhardt, E.E. [eds.]; PB: 226 p.
- Country of Publication:
- United States
- Language:
- English
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