KHANH T NGUYEN
Nail Technician in Silver Spring, MD

H002010, Jan 1, 2002

Mar 2, 1995

08/397860

Khanh T. Nguyen - Silver Spring MD
David N. Smithe - Woodridge VA

United States of America - Washington DC

H01J 302

31511181, 330 4, 315 1, 315 35

A gyrotron gun that generates gyrating electron beams in a controllable manner suitable for use in a wide range of gyro-amplifiers and gyro-oscillators is disclosed. The gyrotron comprises first and second means for abruptly changing a magnetic field and which means are positioned between first, second and third field coils. The field coils are operated so as to provide for a desired magnetic field profile that allows for the control of the parameters desired to provide for small-orbit, large-orbit, and linear modes of operation of the gyrotron gun. The gyrotron gun further comprises of a pair of bucking coils arranging near the cathode to independently control the axial velocity spread of the gyrating electron beam.

5142250, Aug 25, 1992

Jan 14, 1992

7/819699

Han S. Uhm - Potomac MD
Khanh T. Nguyen - Silver Spring MD

The United States of America as represented by the Secretary of the Navy - Washington DC

H03B 900

331 83

Conversion of electron beam energy into high power microwave energy is efted within the cavity of a Klystron device to which the electron beam is accelerated from a continuous supply source through an ion focussing channel. Ion focussing is achieved by establishment of a preionized background plasma within the channel to modulate the current of the electron beam in response to wake field effects and cause bunching of the electron beam during propagation to the Klystron device.