Slow-wave induction plasma transport
First Claim
1. A method for transporting a plasma down a duct, the method comprising the steps of:
- inducing an electron current in said plasma;
inducing an RF magnetic field in said plasma through a set of coil inductors coaxially and equally spaced disposed along the duct;
wherein, an interaction between said electron current and said RF magnetic field is such that a magnetohydrodynamic (MHD), j×
B, is created that moves said plasma down the duct in one direction.
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Abstract
A plasma transport system uses a slow-wave power signal in external radio-frequency (RF) inductors to force plasmas to flow through ducts, such as from a plasma generator to a point of use. A magneto-hydrodynamic force is deliberately created by the RF inductors to displace plasma electrons down along the inside of the ductwork. A charge separation results that both drags the ions along and slows down the electrons with the ion drag. The consequence is that both electrons and ions are motivated down the ductwork and the overall plasma charge stays neutral. A directed stream of energetic ions and neutral gas atoms can be realized. The RF electric fields induced in the plasma tend to counteract any electron cooling and help maintains the plasma electron temperature enough to reduce later reionization power demands.
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Citations
11 Claims
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1. A method for transporting a plasma down a duct, the method comprising the steps of:
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inducing an electron current in said plasma;
inducing an RF magnetic field in said plasma through a set of coil inductors coaxially and equally spaced disposed along the duct;
wherein, an interaction between said electron current and said RF magnetic field is such that a magnetohydrodynamic (MHD), j×
B, is created that moves said plasma down the duct in one direction. - View Dependent Claims (2, 3)
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4. A method for transporting ionized gas plasmas, the method comprising the steps of:
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generating a progressive, inductive slow wave;
passing a plasma coaxially through a cylindrical conduit from an input to an output;
winding said conduit with a number of progressively phased inductors; and
powering successive ones of said inductors with samples of said inductive slow wave such that said plasma is longitudinally motivated in one direction inside said cylindrical conduit;
wherein, a phased array of inductors induce RF electric currents inside the conduit that drives currents in the plasma electrons that are synchronously phased with induced RF magnetic fields so that a force on the electron currents has the same direction at all times of operation. - View Dependent Claims (5, 6, 7, 8)
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9. A peristaltic plasma transporter, comprising:
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a duct for conducting a plasma;
a phased-array of RF inductors linearly disposed between first and second points of the duct; and
a power source for electrically driving individual ones of the RF inductors with a phase that increases with each succeeding inductor to create a peristaltic motion on said plasma;
wherein, said phased-array of RF inductors are synchronously phased to induce an RF electric current inside said duct that drives plasma electron currents with induced RF magnetic fields that a force on the electron currents has the same direction at all times of operation.
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10. A plasma transporter, comprising:
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a hollow cylindrical conduit comprised of dielectric material;
a plasma-source opening at a first end of the cylindrical conduit;
a plasma-output opening at a second, opposite end of the cylindrical conduit;
a longitudinal phased-array of ring-shaped inductors coaxially disposed about the cylindrical conduit between said first and second ends; and
a power source for electrically driving individual ones of the ring-shaped inductors with a phase that increases with each succeeding inductor;
wherein, said phased array of inductors are synchronously phased to induce an RF electric current inside said conduit that drives plasma electron currents with induced RF magnetic fields that a force on the electron currents has the same direction at all times of operation.
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11. A method for transporting a plasma, the method comprising the steps of:
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inducing an electron current in a plasma;
inducing an RF magnetic field in said plasma;
wherein, an interaction between said electron current and said RF magnetic field is such that a magnetohydrodynamic (MHD), j×
B, is created that moves said plasma down a duct in one direction; and
generating said RF magnetic field with a phased array of inductors disposed along said duct.
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Specification