Electron gun and magnetic circuit for an improved THz...

Details Electron gun and magnetic circuit for an improved THz... Electron gun and magnetic circuit for an improved THz...

2007-08-01

2010-10-05

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

C315S005350

Reexamination Certificate

active

07808182

ABSTRACT:
The present invention provides an enhanced THz electromagnetic source structure achieving a very high aspect ratio of 500 to 1 of electron beam width to electron beam thickness of the electron beam moving in the direction across the grating structure while maintaining its cross-section. The structure comprises a magnetic circuit providing a unique low magnetic field slot placed in a steel core for the placement of an electron gun, thus allowing the electron beam to be focused without the interaction of a magnetic field while still supporting a high magnetic field in the grating region. Additionally, the structure comprises an electrostatic shield preventing potential difference between the anode voltage and the grounded steel core from affecting the focusing of the electron beam.

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Joe et al., “Experimental and Theoretical Investigations of a Rectangular Grating Structure for Low-Voltage Traveling Wave Tube Amplifiers.” 1997 American Institute of Physics.; Phys. Plasmas 4 (7) pp. 2707-2715 (Jul. 1997).
Sherwin et al., “Opportunities in THz Science.” Report of a DOE-NSF-NIH Workshop held Feb. 12-14, 2004, Arlington, VA (Feb. 2004).
International Search Report for PCT/US2007/074979, dated Jul. 23, 2008.

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