COHERENT, TUNABLE, CW OSCILLATIONS IN A SMOOTH-BORE MAGNETRON - THE PLASMA MAGNETRON,
FLORIDA UNIV GAINESVILLE ELECTRON DEVICES LAB
Pagination or Media Count:
Coherent, CW oscillations are generated in a smooth-bore magnetron when the end plates are operated at anode potential allowing the electrons of the discharge free access to them. These oscillations, which occur in a coaxial cavity whose lowest order resonant TEM mode is about 8.5 GHz, are continuously tunable over the frequency range from 800 mHz to 3,000 mHz by varying the magnetic field. The frequency is nearly, but not exactly, the electron cyclotron frequency. For this reason, this oscillation is referred to as the cyclotron mode, to distinguish it from other geometry-dependent modes which are observed to appear only with critical values of discharge current and magnetic field. Both modes of oscillation are observed only with pressure below 1 micron. At higher pressures, a plasma forms and oscillations, when observed, have the character of wide-band peaks of hash.
- Electrical and Electronic Equipment
- Plasma Physics and Magnetohydrodynamics