Chaoyu Liu

US Patent:

8390200, Mar 5, 2013

Filed:

Feb 5, 2010

Appl. No.:

12/658356

Inventors:

Shenggang Liu - Chengdu, CN
Chaoyu Liu - Williamsburg VA, US

International Classification:

H01J 25/10

US Classification:

315 4, 315 5, 315 513, 315 531

Abstract:

A coaxial cavity gyrotron with two electron beams includes an electron gun (magnetron injection gun, “MIG,” with two beams), a coaxial beam-wave interaction cavity and an outer magnetic field tube. The coaxial beam-wave interaction cavity consists of two parts: an outer conductor and an inner conductor. The two hollow electron beams produced by the MIG are located between the outer conductor and the inner conductor. The MIG includes inner and outer anodes, with a single cathode located between the anodes. The cathode further includes two emitter rings which produce the two hollow electron beams. The entire gyrotron is immersed in the magnetic field tube such that the magnetic field profile is the same or similar to that for a coaxial gyrotron with one electron beam.

US Patent:

20070285018, Dec 13, 2007

Filed:

Dec 15, 2006

Appl. No.:

11/639971

Inventors:

Shenggang Liu - Williamsburg VA, US
Chaoyu Liu - Williamsburg VA, US

International Classification:

H01J 23/34

US Classification:

315001000

Abstract:

A coaxial cavity gyrotron with two electron beams includes an electron gun (magnetron injection gun, “MIG,” with two beams), a coaxial cavity and a magnetic field tube. The coaxial cavity consists of two parts: an outer conductor and an inner conductor The two hollow electron beams produced by the electron gun are located between the outer conductor and the inner conductor The MIG with two electron beams includes inner and outer anodes with a cathode located between the anodes. The cathode further includes two emitter rings which produce the two hollow electron beams The entire gyrotron is immersed in the magnetic field tube such that the magnetic field profile is the same or similar to that for a coaxial gyrotron with one electron beam.

US Patent:

53878426, Feb 7, 1995

Filed:

May 28, 1993

Appl. No.:

8/068508

Inventors:

John R. Roth - Knoxville TN
Peter P. Tsai - Knoxville TN
Chaoyu Liu - Knoxville TN

Assignee:

The University of Tennessee Research Corp. - Knoxville TN

International Classification:

H01J 724
H05B 3126

US Classification:

31511121

Abstract:

A steady-state, glow discharge plasma is generated within the volume between a pair of parallel, insulated metal plate electrodes spaced up to 5 cm apart and R. F. energized with an rms potential of 1 to 5 KV at 1 to 100 KHz. The electrodes are located within an enclosure capable of maintaining an atmosphere other than atmospheric air between the electrode surfaces. Space between the electrodes is occupied by a noble gas such as helium, neon, argon, etc. or mixtures thereof.

US Patent:

54143241, May 9, 1995

Filed:

Oct 29, 1993

Appl. No.:

8/145786

Inventors:

John R. Roth - Knoxville TN
Peter P. Tsai - Knoxville TN
Chaoyu Liu - Knoxville TN
Mounir Laroussi - Knoxville TN
Paul D. Spence - Knoxville TN

Assignee:

The University of Tennessee Research Corporation - Knoxville TN

International Classification:

H01J 724

US Classification:

31511121

Abstract:

A steady-state, glow discharge plasma is generated at one atmosphere of pressure within the volume between a pair of insulated metal plate electrodes spaced up to 5 cm apart and R. F. energized with an rms potential of 1 to 5 KV at 1 to 100 KHz. Space between the electrodes is occupied by air, nitrous oxide, a noble gas such as helium, neon, argon, etc. or mixtures thereof. The electrodes are charged by an impedance matching network adjusted to produce the most stable, uniform glow discharge.