US Pat. No. 9,196,449

FLOATING GRID ELECTRON SOURCE

FAR-TECH, Inc., San Dieg...

1. A system comprising:
an RF cavity; and
a floating grid structure, including:
a main emitter;
a floating grid configured to capture a portion of the electron current emitted by the main emitter; and
a discharging emitter in electrical contact with the floating grid and configured to discharge the floating grid;wherein the floating grid and the discharging emitter are electrically insulated from the main emitter and the RF cavity,
when the RF cavity is not in operation.

US Pat. No. 9,159,517

PHOTOCATHODE ENHANCEMENT SYSTEM

FAR-TECH, INC., San Dieg...

1. A photocathode enhancement system comprising:
a photocathode having a cathode plate configured to undergo movement relative to an incident optical beam, wherein the cathode
plate has an emission surface of an area between about 0.5 cm2 to about 100 cm2; and

a motion controller configured to control the movement of the cathode plate relative to the optical beam, so that the optical
beam successively strikes non-overlapping portions of the emission surface.

US Pat. No. 10,398,018

COUPLING CANCELLATION IN ELECTRON ACCELERATION SYSTEMS

FAR-TECH, Inc., San Dieg...

1. A thermionic RF gun, comprising:a first RF cavity;
a second RP cavity connected to the first RF cavity along an axis;
a thermionic cathode configured to generate electrons for entry into the first RF cavity; and
a dual RF feed configured to provide input power to each of the first and second RF cavities independently, so as to generate an RF field in each of the first and second RF cavities;
wherein a length of the first RF cavity is less than 0.25 inches so as increase a launch phase ?BB at which back-bombardment occurs, thereby reducing an electron back-bombardment power of the thermionic RF gun;
wherein a center of the second RF cavity is located at a distance not more than 1.5 inches from a center of the first RF cavity, along the axis, thereby increasing an electron capture rate of the thermionic RF gun;
and
wherein an electric coupling between the first and second RF cavities is cancelled out by a magnetic coupling between the first and second RF cavities, so that a phase of the RF field in the first RF cavity is controllable independently of a phase of the RF field in the second RF cavity.