US 9,072,156 B2Granted

Diamagnetic composite material structure for reducing undesired electromagnetic interference and eddy currents in dielectric wall accelerators and other devices

AssigneeLawrence Livermore National Security, LLC

InventorsGeorge J. Caporaso, Brian R. Poole, Steven A. Hawkins

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Abstract

The devices, systems and techniques disclosed here can be used to reduce undesired effects by magnetic field induced eddy currents based on a diamagnetic composite material structure including diamagnetic composite sheets that are separated from one another to provide a high impedance composite material structure. In some implementations, each diamagnetic composite sheet includes patterned conductor layers are separated by a dielectric material and each patterned conductor layer includes voids and conductor areas. The voids in the patterned conductor layers of each diamagnetic composite sheet are arranged to be displaced in position from one patterned conductor layer to an adjacent patterned conductor layer while conductor areas of the patterned conductor layers collectively form a contiguous conductor structure in each diamagnetic composite sheet to prevent penetration by a magnetic field.

Claims23

Dependent claims

A dielectric wall accelerator for accelerating charged particles, comprising:

a dielectric tube to receive a pulse of charged particles propagating along a tube lengthwise direction of the dielectric tube;
a series of unit cells located outside, and engaged to, different tube sections of the dielectric tube, the unit cells each including parallel electrical conductor lines transversely connected to the different tube sections, respectively, and spaced apart along the tube lengthwise direction to apply electrical signals to effectuate acceleration electrical fields at the different tube sections along the tube lengthwise direction inside the dielectric tube;
a control device coupled to the unit cells to supply electrical power to the parallel electrical conductor lines within the unit cells and to control the unit cells to turn on and off the applied electrical signals in the unit cells, respectively, one unit cell at a time sequentially along the tube lengthwise direction to synchronize the acceleration electrical field at the different tube sections with propagation of the pulse of charged particles to accelerate the charged particles;
and
a diamagnetic composite material structure outside the unit cells to surround the dielectric tube and the unit cells and including diamagnetic composite sheets that are separated from one another to provide a high impedance composite material structure, wherein each diamagnetic composite sheet includes patterned conductor layers that are separated by a dielectric material and each include voids and conductor areas, wherein voids in the patterned conductor layers of each diamagnetic composite sheet are arranged to be displaced in position from one patterned conductor layer to an adjacent patterned conductor layer while conductor areas of the patterned conductor layers collectively form a contiguous conductor structure in each diamagnetic composite sheet to prevent penetration by a magnetic field, and wherein each diamagnetic composite sheet is connected to at least one conductor line in a respective unit cell to reduce a magnetic field induced current.

2 more elements

A method for reducing electromagnetic interference in a dielectric wall accelerator for accelerating charged particles that includes a dielectric tube, a stack of Blumlein unit cells located outside, and engaged to, different tube sections of the dielectric tube to apply electrical signals to effectuate acceleration electrical fields at the different tube sections along a tube lengthwise direction inside the dielectric tube, comprising:

providing a diamagnetic composite material structure outside the Blumlein unit cells to surround the dielectric tube and the Blumlein unit cells to reduce magnetic interference caused by one Blumlein unit cell to other Blumlein unit cells, wherein the diamagnetic composite material structure include diamagnetic composite sheets that are separated from one another and each diamagnetic composite sheet includes patterned conductor layers that are separated by a dielectric material and each include voids and conductor areas, and wherein voids in the patterned conductor layers of each diamagnetic composite sheet are arranged to be displaced in position from one patterned conductor layer to an adjacent patterned conductor layer while conductor areas of the patterned conductor layers collectively form a contiguous conductor structure in each diamagnetic composite sheet to prevent penetration by a magnetic field;
and
connecting each diamagnetic composite sheet to one or more conductors in a respective Blumlein unit cell to reduce a magnetic field induced current.

A device having a reduced electromagnetic interference, comprising:

a series of circuits located adjacent to one another, each circuit including electrical conductors to carrying one or more time-varying electric currents which induce one or more time-varying magnetic fields that extend to one or more adjacent circuits and thus induce magnetic field induced eddy currents in electrical conductors of the one or more adjacent circuits;
and
a diamagnetic composite material structure coupled to the circuits to surround the circuits and including diamagnetic composite sheets that are separated from one another to provide a high impedance composite material structure, wherein each diamagnetic composite sheet includes patterned conductor layers that are separated by a dielectric material and each include voids and conductor areas, wherein voids in the patterned conductor layers of each diamagnetic composite sheet are arranged to be displaced in position from one patterned conductor layer to an adjacent patterned conductor layer while conductor areas of the patterned conductor layers collectively form a contiguous conductor structure in each diamagnetic composite sheet to prevent penetration by a magnetic field, and
wherein the diamagnetic composite sheets are electrically coupled to the circuits, respectively, to reduce a magnetic field induced eddy current in one circuit that is caused by another circuit, the patterned conductor layers in each diamagnetic composite sheet being electrically coupled to electrical conductors of a respective circuit.

1 more element

Dependencies are inferred from the claim text.