USA As Represented by Secretary of the Navy

Other

The United States of America

Moshe Friedman

Victor Serlin

Michael G Ury

Yue-Ying Lau

John D Sethian

Matthew C Myers

Frank Hegeler

Jonathan F Krall

Chen Ying

David Rohinsky

Guitar neck

Cordless massager

A high power diode includes a cathode for emitting a primary electron discharge, an anode, and a porous dielectric layer, e.g. a honeycomb ceramic, positioned between the cathode and the anode for receiving the primary electron discharge and emitting a secondary electron discharge. The diode can operate at voltages 50 kV and higher while generating an electron beam with a uniform current density in the range from 1 A/cmto &#x3e;10 kA/cmthroughout the area of the cathode. It is capable of repetitively pulsed operation at a few Hz with pulse duration from a few nanoseconds to more than a microseconds, while the total number of pulses can be &#x3e;10pulses. The diode generates minimal out-gassing or debris, i.e. with minimal ablation, providing a greater diode lifetime, and can operate in a high vacuum environment of 10Torr. The high power diode is useful in many applications requiring a high current electron beam. Exemplary applications include x-ray photography of large samples, polymerization processes, sterilization of biological and chemical agents, irradiation of food, and as a pump for lasers, e.g. excimer lasers such as krypton fluorine (KrF) lasers.

High power diode utilizing secondary emission

A klystron amplifier in which the drift tube is in the form of a casing and a central member disposed coaxially about the same centerline to form a coaxial space between the central member and the casing which runs parallel to the centerline, and through which the klystron's electron beam flows. The casing and central member are maintained at ground potential, which maintains the space charge of the electron beam at a low level, permitting the klystron to operate more efficiently and output higher power.

High power klystron amplifier

A shower stall booth is converted into a bath by supporting an integral sheet of waterproof material against the upstanding walls of the shower stall. Support components extend across the open side of the shower stall to further support the waterproof sheet. A second embodiment enables the waterproof insert to extend outward from within the stall shower to any desired length and breadth. A third embodiment enables the waterproof tub insert to extend upward to any desire height. Fourth and fifth embodiments accomplish the shower stall bath conversion by means of affixing either a watertight wall or a partial tub insert to the open side of the shower stall.

Shower stall bath

A system for providing a compact, high power particle accelerator powered by a modulated intense relativistic electron beam. In a preferred embodiment a first source develops a high power intense relativistic electron beam (IREB). A modulating apparatus modulates the IREB with a low power level RF signal to produce a high power MIREB. All of the kinetic energy from the high power MIREB is then stored as a high level of electromagnetic or RF energy in an accelerating apparatus. A particle beam from a source is modulated with the RF signal to establish a phase coherency between the modulated particle beam and the stored RF energy before it is passed through the accelerating apparatus. This phase coherent particle beam is accelerated by the stored RF energy as it drains this energy from the accelerating apparatus during its passage through the accelerating apparatus.

Compact high power accelerator

An RF amplifier wherein an IREB interacts with RF energy from an RF energy source coupled via an RF cavity to a tube drift region where the IREB is modulated at the frequency of the RF energy source, to provide high gain amplification at high power and high efficiency.

Multi-gigawatt high-efficiency RF amplifier

A device for converting the kinetic energy of an intense relativistic electron beam (IREB) into trains of multi-gigawatt AC electrical pulses comprising a foilless diode for generating an IREB and injecting the IREB into one end of a drift tube. The device further includes a modulating circuit for modulating the IREB current while in the drift tube to obtain longitudinally spaced bunches of electrons, and a coaxial transmission line with the end of its center conductor disposed across the other end of the drift tube in the path of the IREB. A gap is disposed between the end of the drift tube and the end of the center conductor. The modulated IREB induces a voltage in the coaxial transmission line. This voltage appears across the gap to slow down the electrons and to convert the kinetic energy of the IREB into electrical energy that propagates along the coaxial transmission line.

IREB converter to AC pulses

The present invention comprises a device for generating a modulated intense relativistic electron beam (IREB) with an electronically tunable frequency, comprising: a longitudinally running drift tube; a plurality of gaps in the drift tube including a first gap and a second gap, disposed with a predetermined distance 1 therebetween; and a plurality of cavities, with a first cavity disposed around the drift tube at the location of the first gap, and a second cavity disposed around the drift tube at the location of the second gap. These first and second cavities are provided with volumes and a geometry such as to excite a predetermined frequency band below the plasma frequency for the device. A circuit is provided for generating an IREB and injecting this IREB to propagate within the drift tube with a predetermined plasma frequency. Additionally, a main magnetic field generating means is provided for generating a magnetic field for confining the IREB to a desired beam diameter. The frequency tuning is obtained by providing an auxiliary magnetic field running parallel to and within the drift tube and located only along a predetermined length between the first and second gaps, with this auxiliary magnetic field being tunable to thereby tune the frequencies of excitations in the first and second gaps. Finally, a means is provided at one end of the drift tube for converting the kinetic energy of the IREB into electrical energy.

Generation of a modulated IREB with a frequency tunable by a magnetic

A current-reducing device (fuse or switch) is described comprising a foil mber of Al or Mg which is immersed in a fluid with which it will chemically react (such as H.sub.2 O or H.sub.2 O.sub.2) above a certain temperature. The foil member is an electrical conductor but becomes an electrical insulator as a result of the chemical reaction.

Current-reducing device

A collective particle accelerator including an intense relativistic elect beam (IREB) generator, an automodulation section, an acceleration region and injection region. A negative high voltage is applied to a ring cathode which produces an IREB. The IREB propagates through the accelerator. On propagating through the automodulation section, the electrons are modulated thereby forming them into ring-shaped bunches. The acceleration section is surrounded by a longitudinal uniform magnetic field along its length and is provided with special magnetic field means which changes the uniform magnetic field to a rippled magnetic field. The rippled magnetic field causes the bunches of electrons to contract and expand radially as they propagate through the rippled magnetic field which in turn causes ions or electrons injected into the system to be accelerated by attraction or repulsion as the electron rings contract and expand radially.

Collective particle accelerator

A relativistic electron beam device for producing highpower microwave radion. The device comprises an electron beam injection gun, a drift chamber comprising a tube having a plurality of gapped resonant cavities along its length, means for converting the energy-modulated beam and means for extracting rf (microwave) radiation from the density-modulated, relativistic, electron beam.

Growing community of inventors

Washington, DC, United States of America

Moshe Friedman