Claims
- 1. A crossed-field device such as a crossed-field amplifier, such device including:an inlet for accepting an input signal to said device for amplification, said inlet having an inlet window; an outlet for carrying an amplified signal from said device; said outlet having an outlet window; a cathode body portion having an emitter surface configured for secondary emission of electrons; and an anode portion spaced about said cathode body portion providing a gap between said cathode body portion and said anode portion, said cathode body portion and said anode portion providing an electric field in said gap along an interaction slow wave traveling region wherein a crossed magnetic field in said slow wave traveling region cooperates to maintain emitted electrons on cycloidal pathways as they travel between said inlet and said outlet; wherein at least one of said inlet window and said outlet window is a grooved window; and wherein said crossed-field device operates with a low duty cycle in a switched mode and said crossed-field device further comprises a surface region internally disposed between said inlet and said outlet having a surface material structure that reduces secondary electron emission and operating in conjunction with said grooved window so as to suppress multipactor during switched operation of said crossed-field device, said surface region having a surface material structure that reduces secondary electron emission comprising exposed molybdenum wires, strips or segments provided on a surface of said cathode body portion.
- 2. The crossed-field amplifier of claim 1, wherein said inlet and said outlet each include at least one signal guiding wall and at least one signal guiding wall includes a grooved surface.
- 3. The crossed-field amplifier of claim 2, wherein said anode portion includes a molybdenum oxide coating.
- 4. The crossed-field amplifier of claim 1, wherein the anode portion includes a molybdenum oxide coating for multipactor suppression.
- 5. The crossed-field amplifier of claim 1, wherein said at least one grooved window includes a regular array of parallel grooves extending across an rf aperture of said window, said grooves having a spacing, a width and a depth to suppress multipactor.
- 6. The crossed-field amplifier of claim 5, wherein said grooves are approximately one-quarter millimeter wide and approximately one-quarter millimeter deep.
- 7. A crossed-field device such as a crossed-field amplifier, such device including:an inlet for accepting an input signal to said device for amplification, said inlet having an inlet window; an outlet for carrying an amplified signal from said device; said outlet having an outlet window; a cathode body portion having an emitter surface configured for secondary emission of electrons; and an anode portion spaced about said cathode body portion providing a gap between said cathode body portion and said anode portion, said cathode body portion and said anode portion providing an electric field in said gap along an interaction slow wave traveling region wherein a crossed magnetic field in said slow wave traveling region cooperates to maintain emitted electrons on cycloidal pathways as they travel between said inlet and said outlet; wherein at least one of said inlet window and said outlet window is a grooved window; and wherein said crossed-field device operates with a low duty cycle in a switched mode and said crossed-field device further comprises a surface region internally disposed between said inlet and said outlet having a surface material structure that reduces secondary electron emission and operating in conjunction with said grooved window so as to suppress multipactor during switched operation of said crossed-field device, said surface region having a surface material structure that reduces secondary electron emission comprising a molybdenum oxide coating provided on said anode portion.
- 8. The device of claim 7, wherein exposed molybdenum wires, strips or segments are provided on a surface of said cathode body portion.
- 9. The device of claim 7, wherein said inlet and said outlet each include at least one signal guiding wall and at least one signal guiding wall includes a grooved surface.
- 10. The device of claim 7, wherein said at least one grooved window includes a regular array of parallel grooves extending across an rf aperture of said window, said grooves having a spacing, a width and a depth to suppress multipactor.
- 11. The device of claim 16, wherein said grooves are approximately one-quarter millimeter wide and approximately one-quarter millimeter deep.
CROSS REFERENCE TO RELATED APPLICATION
This application is related to provisional patent application Ser. No. 60/111,182 filed on Dec. 7, 1998. The benefit of that provisional filing is hereby claimed.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Portions of the present invention were made with support under contracts N00014-92-C-2026 and N00164-90-C-0121 from the United States Navy.
US Referenced Citations (4)
Provisional Applications (1)
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Number |
Date |
Country |
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60/111182 |
Dec 1998 |
US |