Guard Electrode Secondary Particle Suppression in Charge Exchange Devices
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Solution Overview
Problem
Existing charge exchange devices in particle accelerators face challenges in efficiently suppressing secondary particles, which lead to reduced system reliability and potential failures due to excessive heating and ion-surface interactions, with existing solutions like magnetic deflection and electrostatic biasing having limitations such as energy dependence and high power consumption.
Innovation Solution
The implementation of guard electrodes at the ends of the charge exchange device, biased to attract oppositely charged secondary particles and repel similarly charged particles, effectively capturing or deflecting them, thereby reducing secondary ion emissions and maintaining system integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic deflection is used to suppress secondary particles, then secondary particle emissions are reduced, but the system becomes energy dependent and requires complex magnetic field arrangements
Solution Approach 1:
The patent replaces the magnetic deflection system with an electrostatic guard electrode system. Instead of using complex magnetic fields to deflect secondary particles, the invention uses electric fields generated by guard electrodes biased at appropriate potentials to attract and collect secondary ions, thereby suppressing their emissions. This substitution simplifies the system architecture while maintaining effectiveness.
2Reliability
If electrostatic biasing is used to suppress secondary particles, then secondary particle emissions are reduced, but power consumption increases
Solution Approach 1:
The patent applies electrostatic biasing locally only at the guard electrodes positioned near the charge exchange device, rather than applying electric fields throughout the entire accelerator system. By confining the electrostatic suppression mechanism to specific localized regions where secondary particles are generated and escape, the power consumption is minimized while maintaining effective suppression where needed.
3Temperature
If guard electrodes are used to suppress secondary particles, then secondary ion emissions are reduced and heating is minimized, but additional components are added to the system
Solution Approach 1:
The guard electrodes serve multiple functions simultaneously: they suppress secondary particle emissions, collect secondary ions to prevent them from reaching and heating accelerator components, and can be integrated with existing electrode structures in the accelerator. This multi-functionality reduces the need for separate dedicated suppression components.
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 efficiently suppresses secondary particles with low power consumption, minimizing heating and maintaining the main accelerating voltage, thus enhancing the reliability and longevity of the particle accelerator system.
Implementation Method 1
the guard electrode is adapted to be negatively biased with respect to the charge exchange device. The first guard apparatus can be configured to repel negative particles and attract positive particles
Implementation Method 2
a charge exchange device can convert an input beam having a negative net charge to an output beam having a positive net charge
Data Source
AI summary
Embodiments of systems, devices, and methods relating to a charge exchange system having one or more guard apparatuses are described. The guard apparatuses can include one or more guard electrodes, optionally with one or more screen electrodes. Also described are embodiments of beam systems incorporating one or more charge exchange systems.