Neutral Beam Injection Feedback Control for Single-Cycle Power Variation
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Solution Overview
Problem
Existing neutral beam injection systems face challenges in studying dynamic behavior due to large plasma perturbations and instability, making it difficult to modify current distribution profiles and avoid high-energy particle mode instabilities, with current methods being inefficient and lacking active control.
Innovation Solution
A method for continuously varying beam energy or power within a single injection cycle using plasma feedback control, involving ion source parameter optimization, real-time data analysis, and closed-loop control to manage high-energy particle mode instabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple beam lines are injected alternately and in superposition to study kinetic instability, then the heating parameters can be iterated to achieve effective heating and avoid instability, but the method requires multiple discharges which reduces efficiency and active control capability
Solution Approach 1:
The patent applies dynamics by transitioning from static multiple-discharge iteration to dynamic single-discharge control. The beam power is continuously adjusted during a single discharge cycle according to real-time plasma β feedback, enabling the system to dynamically study instability thresholds and kinetic mechanisms without requiring multiple sequential discharges. This dynamic approach maintains stability control while dramatically improving experiment efficiency.
Solution Approach 2:
The patent implements feedback control by using real-time plasma β measurements to adjust beam power during the injection cycle. The control system continuously monitors plasma parameters and modifies beam power accordingly, enabling active control of instability development. This feedback mechanism replaces the trial-and-error multiple-discharge method with a single controlled discharge, resolving the contradiction between reliability and productivity.
2Reliability
If traditional neutral beam injection keeps power and beam energy stable in the plasma discharge region, then the physical mechanism is clear and heating is effective, but it is difficult to study dynamic behavior due to large perturbation of background plasma
Solution Approach 1:
The patent applies dynamics by enabling time-varying beam power within a single discharge cycle while maintaining overall heating effectiveness. The beam power is modulated according to plasma β feedback, creating controlled perturbations that allow study of dynamic plasma behavior. This dynamic approach maintains the heating effectiveness of traditional stable injection while adding the adaptability needed to study kinetic instability and dynamic responses.
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
Enables precise control of plasma rotation profiles and instability conditions, allowing for clearer study of kinetic instabilities and improved research capabilities in fusion devices.
Implementation Method 1
The neutral beam injection device injects energetic neutral particles into the background plasma of the fusion device, which are ionized by collisions with electrons and ions
Implementation Method 2
This portion of the ionized neutral particles forms fast ions, which are then confined by the magnetic field of the fusion device
Implementation Method 3
heating of the background plasma is achieved by charge exchange under the influence of Coulomb collision
Implementation Method 4
heating of the background plasma is achieved by charge exchange under the influence of Coulomb collision
Implementation Method 5
the beam current and the beam power within a single injection period are actively controlled, namely, reducing the beam power when the plasma β or the β of high-energy ions approaches an instability limit by feedback of plasma diagnostic data
Data Source
AI summary
The present invention provides a neutral beam injection power feedback control method, which belongs to the field of neutral beam injection, and studies the optimal matching relationship of operating parameters of the ion source by analyzing the ion optical characteristics of a hot cathode ion source so as to expand the optimal operating range of the ion source. Based on this, linear dynamic control of injection power in a single injection cycle is completed so as to form an operation mode based on plasma feedback. The process provided by the present invention includes the following two methods. Method 1, the beam power is dynamically adjusted under constant extraction energy. Method 2, under variable extraction energy, the tracking control of probe setting value is completed to realize the dynamic adjustment of beam power under variable energy. The present invention proposes a study protocol of continuously varying beam energy or beam power in a single injection cycle discharge to develop a study of dynamic control of injection power.