Rotating Core Plasma Compression for Lower Structural Stress
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Solution Overview
Problem
Existing plasma compression systems face challenges in efficiently compressing plasma to achieve fusion conditions while minimizing structural stresses and energy consumption, particularly in large-scale applications.
Innovation Solution
A plasma compression system utilizing an annular rotating core with compression drivers and implosion drivers, where a rotating core circulates a liquid medium to form a liquid liner, and compression drivers create a pressure pulse to implode the liner, using gas-filled gaps to reduce shear forces and optimize energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a rotating cylindrical liquid metal liner is driven radially by free-pistons to form a liquid liner cavity, then plasma compression to fusion conditions is achieved, but very large centripetal structural forces are created in large-scale systems
Solution Approach 1:
The patent transitions from a cylindrical liquid liner geometry to a spherical liquid liner geometry. The spherical configuration reduces the radius of rotation for a given volume, thereby significantly reducing the centripetal forces (F = mv²/r) that the structural components must withstand. This geometric change allows large-scale power production while maintaining manageable structural stress levels.
Solution Approach 2:
The patent employs dynamic compression where the spherical liquid liner is rapidly accelerated and then allowed to implode inward under its own inertia. This dynamic approach achieves the necessary compression ratios and temperatures for fusion without requiring continuous high-force structural support, as the compression occurs during a brief implosion phase rather than during steady-state rotation.
2Productivity
If a rotor circulates liquid medium to create a liquid liner, then plasma compression is achieved, but large shear forces are created due to fluid coupling requiring additional energy
Solution Approach 1:
The patent introduces a gas-filled annular gap between the rotor and the spherical liquid liner as an intermediary medium. This gas layer acts as a low-shear coupling that transmits rotational motion from the rotor to the liquid liner without creating the large shear forces that would occur with direct liquid-to-liquid or liquid-to-solid contact. The gas cushion reduces viscous drag and allows more efficient energy transfer.
Solution Approach 2:
The patent utilizes a gas-filled annular gap (pneumatic coupling) between the rotor and liquid liner to transmit rotational motion. This pneumatic coupling mechanism reduces the energy required to drive the rotor by minimizing shear forces, as gases have much lower viscosity and shear resistance compared to liquids. The gas layer allows smooth, low-friction transmission of rotational energy to form and circulate the liquid liner.
3Temperature
If compression drivers are fixedly mounted to compress plasma, then fusion conditions are achieved, but structural stresses on the vessel are increased
Solution Approach 1:
The patent employs spherical compression drivers mounted on the outer surface of the spherical vessel rather than cylindrical geometry. The spherical configuration distributes compression forces more uniformly across the vessel wall, reducing stress concentrations. The curved surface allows compression forces to be applied radially inward, optimizing the structural efficiency of the spherical vessel wall.
Solution Approach 2:
The compression drivers operate by applying periodic pulsed forces to the liquid liner, causing it to implode inward and compress the plasma. This periodic implosion approach allows the vessel structure to withstand peak compression forces during brief intervals rather than requiring continuous high-strength support. The pulsed nature of the compression reduces cumulative stress on the vessel wall compared to continuous compression.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively compresses plasma to achieve fusion conditions with reduced energy input, minimizing structural stresses and enabling efficient plasma confinement for nuclear fusion applications.
Implementation Method 1
The cylindrical cavity is formed by rotating a liquid metal cavity liner such that centrifugal force moves the liquid metal against the walls of the rotating cylinder, forming a liquid liner.
Implementation Method 2
compression drivers create a pressure pulse to implode the liner
Implementation Method 3
using gas-filled gaps to reduce shear forces and optimize energy efficiency
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A plasma compression system comprises a plasma containment vessel, an annular rotating core inside the vessel, and a plurality of compression drivers fixedly mounted to an outer surface of the vessel wall. The annular rotating core contains a liquid medium and is rotatable to circulate the liquid medium and form a liquid liner with a cavity. The rotating core comprises an outer surface spaced from an inner surface of the vessel wall to define an annular gap, and a plurality of implosion drivers each comprising a pusher bore with a pusher piston slideable therein. Each pusher bore extends through the rotating core. The plurality of compression drivers compresses a compression fluid in the annular gap and creates a pressure pulse, such that when the rotating core rotates and the liquid medium fills the pusher bores, the pusher pistons are operable to push the liquid medium inwards to collapse the liquid liner and compress a plasma in the cavity.