FRC Fusion Reactor Gas Box for Scrape-Off Layer Control
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Solution Overview
Problem
Current fusion reactor designs face challenges such as high radioactivity, complex maintenance, large size, and inefficient neutron ash removal, which hinder the development of small, safe, and clean power plants suitable for distributed power grids.
Innovation Solution
A system and method for widening and densifying the scrape-off layer (SOL) in a field-reversed configuration (FRC) fusion reactor, including a gas box with a controllable exit orifice to populate the SOL with plasma, decrease fusion product speed, and extract energy for thrust or electrical power, while accelerating ash removal to reduce neutron emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional tokamak fusion reactors are used, then high power output can be achieved, but the reactor size becomes large and neutron radiation levels become high
Solution Approach 1:
The patent changes the fundamental plasma configuration parameter from tokamak to field-reversed configuration (FRC), which fundamentally alters the magnetic field topology and enables compact reactor design. This parameter change allows achieving high power density in a much smaller volume while reducing neutron radiation through advanced fuel cycles
Solution Approach 2:
The patent segments the reactor into distinct functional zones including a compact core plasma region, a scrape-off layer, and an exhaust channel. This segmentation enables optimized performance in each zone while maintaining overall compactness, particularly through the natural exhaust channel design that eliminates the need for large divertor structures
2Power
If D-T fuel is used in fusion reactors, then high power production can be achieved, but neutron radiation and radioactivity increase significantly
Solution Approach 1:
The patent changes the fuel composition parameter from conventional D-T to advanced fuel cycles such as D-3He or p-11B. This parameter change fundamentally reduces neutron production while maintaining viable power output, directly addressing the harmful radiation issue
Solution Approach 2:
The patent converts the previously harmful neutron radiation into a benefit by using advanced fuel cycles that produce charged particles instead of neutrons. The fusion energy is still released but in a form that can be directly converted to electricity with minimal radiation damage and activation
3Power
If fusion reactors are designed for high power output, then energy production increases, but maintenance complexity and costs increase due to neutron damage
Solution Approach 1:
The patent changes the operational parameters by adopting advanced fuel cycles that operate with reduced neutron flux. This parameter change directly reduces material damage and activation, thereby simplifying maintenance requirements and reducing operational complexity despite maintaining high power output
4Reliability
If the scrape-off layer is narrow in FRC reactors, then plasma confinement is maintained, but ash removal efficiency decreases and neutron emissions increase
Solution Approach 1:
The patent applies dynamic control to the scrape-off layer width, allowing it to adjust between narrow and wide configurations. This dynamic adjustment enables the system to maintain plasma confinement when needed while efficiently removing ash and reducing neutron emissions during exhaust phases
Solution Approach 2:
The patent implements preliminary plasma injection through a gas box to pre-condition the scrape-off layer before main plasma injection. This preliminary action creates optimal conditions for both plasma confinement and subsequent ash removal efficiency
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 reduces neutron wall load, enhances safety, and enables the creation of small, clean, and efficient fusion reactors suitable for distributed power grids by minimizing radioactivity and neutron production, allowing for higher power output with reduced reactor size and maintenance costs.
Implementation Method 1
an exit orifice adjoining the gas box, wherein the exit orifice has a controllable radius and length to allow plasma to flow out from the gas box to populate the scrape-off layer with the plasma
Implementation Method 2
decreasing speed of fusion products in the plasma in the SOL, allowing energy to be extracted and converted into thrust or electrical power
Implementation Method 3
accelerating ash removal to reduce neutron emissions
Data Source
AI summary
According to some embodiments, a system for widening and densifying a scrape-off layer (SOL) in a field reversed configuration (FRC) fusion reactor is disclosed. The system includes a gas box at one end of the reactor including a gas inlet system and walls of suitable heat bearing materials. The system further includes an exit orifice adjoining the gas box, wherein the exit orifice has a controllable radius and length to allow plasma to flow out from the gas box to populate the SOL with the plasma. The system may also include fusion products, which decrease in speed in the plasma in the SOL, allowing energy to be extracted and converted into thrust or electrical power and further allowing ash to be extracted to reduce neutron emissions and maintain high, steady-state fusion power.