Massachusetts Institute of Technology

Commonwealth Fusion Systems LLC

The United States of America As Represented by the United States

Martin Greenwald

Zachary S Hartwig

John D Wright

Philip Michael

Rui Vieira

William Beck

Brandon N Sorbom

Robert Mumgaard

Brian Labombard

Daniel Brunner

James Irby

Robert S Granetz

Lihua Zhou

Jeffrey Doody

Alexey L Radovinsky

Shunichi Shiraiwa

Syun'ichi Shiraiwa

Alexey Radovinsky

Vera Talanker

Described herein are concepts, system and techniques which provide a means to construct robust high-field superconducting magnets using simple fabrication techniques and modular components that scale well toward commercialization. The resulting magnet assembly—which utilizes non-insulated, high temperature superconducting tapes (HTS) and provides for optimized coolant pathways—is inherently strong structurally, which enables maximum utilization of the high magnetic fields available with HTS technology. In addition, the concepts described herein provide for control of quench-induced current distributions within the tape stack and surrounding superstructure to safely dissipate quench energy, while at the same time obtaining acceptable magnet charge time. The net result is a structurally and thermally robust, high-field magnet assembly that is passively protected against quench fault conditions.

Grooved, stacked-plate superconducting magnets and electrically conductive terminal blocks and related construction techniques

Described herein are concepts, system and techniques which provide a means to construct robust high-field superconducting magnets using simple fabrication techniques and modular components that scale well toward commercialization. The resulting magnet assembly&#x2014;which utilizes non-insulated, high temperature superconducting tapes (HTS) and provides for optimized coolant pathways&#x2014;is inherently strong structurally, which enables maximum utilization of the high magnetic fields available with HTS technology. In addition, the concepts described herein provide for control of quench-induced current distributions within the tape stack and surrounding superstructure to safely dissipate quench energy, while at the same time obtaining acceptable magnet charge time. The net result is a structurally and thermally robust, high-field magnet assembly that is passively protected against quench fault conditions.

Grooved, stacked-plate superconducting magnets and electrically conductive terminal blocks

A nondestructive apparatus and method for measuring the mass of a moving object, based on the perturbation of the dielectric character of a resonant microwave cavity caused by the object passing through the cavity. An oscillator circuit is formed with a resonant cavity in a positive feedback loop of a microwave power amplifier. The moving object perturbs the resonant characteristics of the cavity causing a shift in the operating frequency of the oscillator proportional to the ratio of the pellet volume to the volume of the cavity. Signals from the cavity oscillation are mixed with a local oscillator. Then the IF frequency from the mixer is measured thereby providing a direct measurement of pellet mass based upon known physical properties and relationships. This apparatus and method is particularly adapted for the measurement of frozen hydrogen pellets.

Microwave measurement of the mass of frozen hydrogen pellets

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Martin Greenwald