Bruce E Carlsten

Author:

Bruce Eric Carlsten

ISBN #:

0735400784

US Patent:

60143878, Jan 11, 2000

Filed:

Aug 20, 1997

Appl. No.:

8/915233

Inventors:

Bruce E. Carlsten - Los Alamos NM

Assignee:

Regents of the University of California - Los Alamos NM

International Classification:

H01S 300

US Classification:

372 2

Abstract:

Autophase stability is provided for a traveling wave device (TWD) electron beam for amplifying an RF electromagnetic wave in walls defining a waveguide for said electromagnetic wave. An off-axis electron beam is generated at a selected energy and has an energy noise inherently arising from electron gun. The off-axis electron beam is introduced into the waveguide. The off-axis electron beam is introduced into the waveguide at a second radius. The waveguide structure is designed to obtain a selected detuning of the electron beam. The off-axis electron beam has a velocity and the second radius to place the electron beam at a selected distance from the walls defining the waveguide, wherein changes in a density of the electron beam due to the RF electromagnetic wave are independent of the energy of the electron beam to provide a concomitant stable operating regime relative to the energy noise.

US Patent:

59563532, Sep 21, 1999

Filed:

Aug 20, 1997

Appl. No.:

8/915235

Inventors:

Dinh C. Nguyen - Los Alamos NM
Bruce E. Carlsten - Los Alamos NM

Assignee:

Regent of the University of California - Los Alamos NM

International Classification:

H01S 302

US Classification:

372 2

Abstract:

A free electron laser (FEL) is provided with an accelerator for outputting electron beam pulses; a buncher for modulating each one of the electron beam pulses to form each pulse into longitudinally dispersed bunches of electrons; and a wiggler for generating coherent light from the longitudinally dispersed bunches of electrons. The electron beam buncher is a chicane having a mask for physically modulating the electron beam pulses to form a series of electron beam bunches for input to the wiggler. In a preferred embodiment, the mask is located in the chicane at a position where each electron beam pulse has a maximum dispersion.

US Patent:

59827874, Nov 9, 1999

Filed:

Apr 21, 1998

Appl. No.:

9/063291

Inventors:

Bruce E. Carlsten - Los Alamos NM

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

H01S 300

US Classification:

372 2

Abstract:

A free electron laser amplifier provides a scalloping annular electron beam that interacts with the axial electric field of a TM. sub. 0n mode. A waveguide defines an axial centerline and, a solenoid arranged about the waveguide produces an axial constant magnetic field within the waveguide. An electron beam source outputs a annular electron beam that interacts with the axial magnetic field to have an equilibrium radius and a ripple radius component having a variable radius with a ripple period along the axial centerline. An rf source outputs an axial electric field that propagates within the waveguide coaxial with the electron beam and has a radial mode that interacts at the electron beam at the equilibrium radius component of the electron beam.

US Patent:

57149135, Feb 3, 1998

Filed:

Dec 8, 1995

Appl. No.:

8/569628

Inventors:

Bruce E. Carlsten - Los Alamos NM
William B. Haynes - Los Alamos NM

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H03B 901
H01J 2506

US Classification:

331 81

Abstract:

A discrete monotron oscillator for use in a high power microwave device is formed with a microwave oscillator having a half-wavelength resonant coaxial microwave cavity operating in fundamental TEM mode for microwave oscillation with an inner conductor defining a drift tube for propagating an electron beam and an outer conductor coaxial with the inner conductor. The inner conductor defines a modulating gap and an extraction gap downstream of the modulating gap. The modulating gap and the extraction gap connect the coaxial microwave cavity with the drift tube so that energy for the microwave oscillation is extracted from the electron beam at the extraction gap and modulates the electron beam at the modulating gap. For high power operation, an annular electron beam is used.

US Patent:

56639716, Sep 2, 1997

Filed:

Apr 2, 1996

Appl. No.:

8/626661

Inventors:

Bruce E. Carlsten - Los Alamos NM

Assignee:

The Regents of the University of California, Office of Technology
Transfer - Alameda CA

International Classification:

H01S 300

US Classification:

372 2

Abstract:

Electron orbits from a helical axial wiggler in an axial guide field are absolutely unstable as power is extracted from the particles. For off-axis beams an axial FEL mechanism exists when the axial electric field in a TM mode is wiggled to interact with the axial velocity of the electrons that form the beam. The interaction strength is comparable to that for helical FELs and is insensitive to beam orbit errors. The orbits for this mechanism are extremely stable in the absence of space charge and lead to high extraction efficiencies without particle phasing incoherence or interception. This interaction mechanism is suitable for use with intense annular electron beams for high power generation at microwave frequencies.