Z-pinch Plasma Confinement via External Injection
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Solution Overview
Problem
Conventional Z-pinch fusion devices face instability issues due to magnetohydrodynamic instabilities, limiting plasma lifetimes and the sustainability of fusion reactions, which hampers the achievement of stable and long-lasting fusion conditions.
Innovation Solution
A plasma processing system that includes a plasma confinement device with an inner and outer electrode configuration to form a reaction chamber, where a source plasma is externally generated and injected into the chamber, and a main power supply applies a voltage to compress the plasma into a Z-pinch configuration, potentially stabilizing it with sheared axial flows to enhance stability and sustain fusion reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional Z-pinch configurations are used, then the device complexity is reduced and cost is lowered, but plasma stability deteriorates due to magnetohydrodynamic instabilities
Solution Approach 1:
The patent applies preliminary action by pre-forming plasma in a separate plasma formation region before injection into the reaction chamber. This allows the plasma to be prepared with controlled properties and then injected in a stable manner, preventing magnetohydrodynamic instabilities from developing during the confinement process. The plasma is formed externally and then transferred to the Z-pinch configuration, rather than attempting to form and confine it simultaneously.
2Length of moving object
If conventional Z-pinch configurations are used, then the geometry is simple and compact, but plasma lifetime is limited due to instabilities
Solution Approach 1:
The plasma is pre-formed in a dedicated formation region with controlled conditions, allowing it to achieve stable characteristics before being injected into the reaction chamber. This preliminary formation step ensures the plasma enters the Z-pinch configuration in a controlled state, extending its lifetime by preventing early onset of instabilities.
Solution Approach 2:
The patent introduces an intermediary plasma formation region that acts as a buffer between the external plasma source and the reaction chamber. This intermediary region allows plasma to be prepared and stabilized before injection, serving as a mediator that protects the main reaction chamber from direct exposure to unstable plasma formation processes.
3Power
If plasma is confined using magnetic fields, then fusion reactions can be sustained, but energy loss increases due to instabilities and confinement challenges
Solution Approach 1:
By pre-forming plasma with controlled density and temperature profiles before injection, the system achieves more efficient energy utilization. The plasma enters the reaction chamber in an optimized state, reducing the energy required for confinement and minimizing losses due to instabilities that would otherwise require additional heating and stabilization.
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
This approach allows for controlled plasma formation and sustainment, potentially achieving higher fusion power gain over longer periods with reduced energy inefficiencies and improved stability of the Z-pinch plasma, thereby overcoming the limitations of conventional Z-pinch configurations.
Implementation Method 1
a main power supply configured to supply power to the plasma confinement device to apply a voltage across the reaction chamber configured to compress the source plasma into a Z-pinch plasma
Implementation Method 2
a plasma formation and injection device configured to form a source plasma outside the reaction chamber and inject the source plasma inside the reaction chamber
Data Source
AI summary
Plasma processing systems and methods for fusion power applications are disclosed. The system can include a plasma confinement device including a reaction chamber; a plasma formation and injection device configured to form a source plasma outside the reaction chamber and inject the source plasma inside the reaction chamber; and a power supply configured to supply power to the plasma confinement device to apply a voltage across the reaction chamber to compress the source plasma into a Z-pinch plasma capable of sustaining fusion reactions. The plasma confinement device can include an inner electrode surrounded by an outer electrode to define therebetween an acceleration region of the reaction chamber. The outer electrode can extend beyond the inner electrode to define an assembly region of the reaction chamber. The source plasma can be injected in the acceleration region and flowed into the assembly region to be compressed into the Z-pinch plasma.