Microwave discharge apparatus
First Claim
1. A microwave electric-discharge apparatus, comprising a waveguide and a dielectric discharge tube provided in a cavity of the wave guide or an extension part of the waveguide, characterized in that the dielectric discharge tube is so formed that the cavity closes to the end with the cross section of the cavity monotonously decreasing along the direction in which a microwave travels in the waveguide, and that a gas port is formed through a waveguide wall.
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Accused Products
Abstract
A discharge tube (31) provided inside the cavity of a waveguide (4) is so structured as to monotonously decrease the cross section of the cavity in the direction in which the microwave travels and thereby to close the cavity. The waveguide (34) has vent holes (34a, 34c) made through the tube wall. A metallic member (32) monotonously decreasing the cross section of the cavity in the direction in which the microwave travels and thereby closing the cavity is provided on the opposite side to the discharge tube (31) in the direction in which the microwave travels. A fluid is made to flow through the metallic member. A gas introducing port is provided in the discharge tube (31), and a gas exhaust port is provided also in the discharge tube (31) on the opposite side to the gas introducing port with respect to the center axis of the waveguide (34). Thus, no standing wave is generated from the time when a plasma is created, the plasma absorbs energy at high efficiency, the temperature at the wall of the discharge area little increases, and the density of active particles is high.
14 Citations
11 Claims
- 1. A microwave electric-discharge apparatus, comprising a waveguide and a dielectric discharge tube provided in a cavity of the wave guide or an extension part of the waveguide, characterized in that the dielectric discharge tube is so formed that the cavity closes to the end with the cross section of the cavity monotonously decreasing along the direction in which a microwave travels in the waveguide, and that a gas port is formed through a waveguide wall.
- 9. A microwave electric-discharge apparatus, comprising a waveguide and a dielectric discharge tube provided in a cavity of the waveguide or an extension part of the waveguide, characterized in that a metallic member provided in the cavity is so formed that the cavity closes to the end with the cross section of the cavity monotonously decreasing along the direction in which a microwave travels in the waveguide, and that a part of the dielectric discharge tube on the opposite surface to the direction in which a microwave travels, contacts the metallic member directly or indirectly with an intermediate between them, or is so close to the metallic member to enable heat conduction.
Specification