Annular Cathode Hall Thruster Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hall thrusters face inefficiencies in electron coupling and design complexity due to the remote location of the cathode relative to the discharge channel, leading to reduced thrust efficiency and increased mass and size.
Innovation Solution
An annular cathode is positioned adjacent to the discharge region, either circumscribing or circumscribed by it, with magnetic poles generating a radial magnetic field, and a propellant gas feeder providing gas to the discharge region, enhancing electron coupling and simplifying the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cathode is positioned remotely from the discharge channel, then the design is simpler, but electron coupling efficiency deteriorates
Solution Approach 1:
The cathode is nested within the discharge channel structure, with the cathode axis coincident with the channel axis. This nested configuration allows the cathode to be positioned centrally within the discharge region, improving electron coupling efficiency while maintaining a compact, integrated design that does not significantly increase overall complexity
2Device complexity
If the cathode is positioned remotely from the discharge channel, then the design complexity is reduced, but thrust efficiency deteriorates
Solution Approach 1:
The invention transitions from a lateral/offset cathode positioning to a coaxial/dimensional alignment where the cathode axis coincides with the discharge channel axis. This dimensional repositioning optimizes the spatial relationship between electron emission source and discharge region, enhancing thrust efficiency while keeping the overall structure relatively simple through axial symmetry
3Weight of moving object
If the cathode is positioned remotely from the discharge channel, then the overall mass and size are reduced, but electron coupling efficiency deteriorates
Solution Approach 1:
The cathode and discharge channel structures are merged into a coaxial configuration where the cathode is positioned within the discharge region rather than being separated. This merging of spatial locations improves electron coupling efficiency by reducing the distance electrons must travel, while the compact coaxial design actually reduces overall mass and size compared to remote cathode configurations that require additional structural support and alignment mechanisms
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 configuration improves electron coupling efficiency, reduces mass and size, and enhances thrust generation while maintaining a simplified design, offering improved performance and efficiency compared to traditional Hall thruster designs.
Implementation Method 1
Ion accelerators with closed electron drift are also known as Hall-effect thrusters or Hall thrusters
Implementation Method 2
The longitudinal electric field accelerates the ions from the open end of the annular channel to generate a reaction force that produces thrust
Implementation Method 3
A cathode introduces free electrons into the area of the open end
Implementation Method 4
The electrons are induced to drift circumferentially in the annular channel by a generally radially extending magnetic field
Data Source
AI summary
A Hall thruster includes an annular discharge region and an annular cathode concentric to the annular discharge region.