Multi-beam Control via Plasma Neutralization
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Solution Overview
Problem
Current charged particle beam technologies face limitations in maximizing current and power due to space charge effects, which restrict the processing rate and efficiency in applications like semiconductor implantation and medical treatments, and also in fusion devices, where achieving higher currents and energies is crucial for improved output and cost-effectiveness.
Innovation Solution
The use of electrostatic and magnetic elements to confine and focus multiple charged particle beams of different energies and polarities along a common axis, allowing for ambipolar acceleration and focusing, which increases the total current and power handling capacity by neutralizing space charge effects and stabilizing orbits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher beam currents are used to increase processing rate, then productivity improves, but space charge effects worsen causing beam instability and energy loss
Solution Approach 1:
A plasma neutralizer is introduced as an intermediary substance between the charged particle beam and the surrounding environment. The plasma provides free electrons that neutralize the space charge effects of the ion beam, allowing higher beam currents to be maintained without causing beam instability or excessive energy loss. This mediator enables the beam to operate at higher currents while maintaining stability.
Solution Approach 2:
The electrical charge parameter of the beam environment is changed by introducing plasma with opposite charge (electrons) to balance the space charge. This parameter change from purely positive space charge to a neutralized environment allows the beam current to be increased without the detrimental effects of space charge repulsion, thereby improving productivity while maintaining reliability.
2Loss of time
If higher beam currents are used to reduce processing time, then loss of time improves, but energy loss increases due to space charge effects
Solution Approach 1:
The plasma neutralizer acts as an intermediary that reduces space charge effects, enabling the beam to maintain higher currents over longer distances without excessive energy loss. By neutralizing the repulsive electric fields, the plasma allows more efficient energy transmission from the source to the target, reducing wasted energy while achieving faster processing.
Solution Approach 2:
The natural electrostatic repulsion mechanism that limits beam current is replaced by a plasma-based neutralization mechanism. Instead of relying on the beam's own electric fields, an external plasma source provides electrons that cancel the space charge, substituting a more efficient energy transmission mechanism that reduces energy loss.
3Device complexity
If single polarity beams are used to simplify system design, then device complexity is reduced, but total current capacity is limited by space charge effects
Solution Approach 1:
The plasma neutralizer serves as an intermediary that enables ambipolar beam operation. By providing electrons to neutralize the space charge of ion beams, the plasma allows both positive and negative particle beams to be used simultaneously without the space charge limitations that would otherwise restrict current capacity. This maintains relatively simple system design while dramatically increasing total current capacity.
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 enables higher trapped currents and increased beam currents in accelerators and fusion devices, enhancing processing rates and output while minimizing energy losses and preventing beam instabilities, thus improving efficiency and cost-effectiveness.
Implementation Method 1
The use of electrostatic and magnetic elements to confine and focus multiple charged particle beams of different energies and polarities along a common axis
Implementation Method 2
The use of electrostatic and magnetic elements to confine and focus multiple charged particle beams of different energies and polarities along a common axis
Implementation Method 3
a first beam of charged particles is accelerated along a beam line to a first energy level... a second beam of charged particles is accelerated along the beam line to a second energy level
Data Source
AI summary
The systems and methods described herein relate to the use of electrostatic elements or combinations of electrostatic and magnetic elements to confine charged particles in stable recirculating, trapped orbits. More particularly, the invention relates to systems and methods for acceleration and focusing of multiple charged particle beams having multiple energies and arbitrary polarities along a common axis.