Betatron Electron Injector Inductive Drive for Borehole Logging
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Solution Overview
Problem
Conventional betatrons with small diameters face challenges in achieving radiation output comparable to larger machines due to inefficient charge trapping and higher power loss, limiting their use in oil well borehole logging applications where size constraints are critical.
Innovation Solution
A betatron magnet design with an electron injector positioned inside the betatron orbit and driven by an inductive means, utilizing an injection coil wound around the vacuum chamber wall, and a resistive coating to generate high voltage pulses for efficient electron injection and acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the betatron diameter is reduced for borehole logging applications, then the device size becomes suitable for confined spaces, but the radiation output decreases due to inefficient charge trapping and higher power loss
Solution Approach 1:
The patent applies preliminary action by pre-positioning the electron injector inside the betatron orbit at the optimal injection point before acceleration begins. The injector is strategically located to ensure electrons are injected at the correct phase of the magnetic field cycle, maximizing charge trapping efficiency. This preliminary positioning resolves the contradiction by enabling effective charge injection in compact devices without requiring larger dimensions for charge accumulation.
Solution Approach 2:
The patent introduces an intermediary mechanism through the use of a resonant cavity and precise timing control system that mediates between the electron injector and the accelerating magnetic field. This intermediary ensures that electrons are injected at the optimal moment when the magnetic field is in the correct phase, maximizing energy transfer and charge trapping efficiency. This resolves the size-output contradiction by enabling efficient energy transfer in compact configurations.
2Ease of operation
If conventional external injection schemes are used, then the injector can be positioned outside the betatron orbit, but charge trapping efficiency is insufficient for small diameter betatrons
Solution Approach 1:
The patent applies inversion by reversing the conventional injection approach: instead of positioning the injector outside the betatron orbit as in traditional designs, the injector is positioned inside the orbit. This inverted configuration allows the injector to be surrounded by the magnetic field, enabling more effective charge trapping and phase synchronization. The inversion resolves the contradiction by making the injector more effective in compact devices while maintaining operational simplicity.
3Reliability
If the magnetic field strength is increased to improve charge trapping, then more electrons can be accelerated, but power loss increases significantly
Solution Approach 1:
The patent applies periodic action by using pulsed magnetic fields with precise timing rather than continuous high-strength fields. The magnetic field is pulsed at the resonant frequency of the betatron, creating optimal conditions for charge trapping only when needed. This periodic approach maintains high charge trapping efficiency during acceleration phases while minimizing power loss during non-acceleration periods, resolving the contradiction between trapping efficiency and energy loss.
Solution Approach 2:
The patent changes the temporal parameters of the magnetic field from continuous to pulsed operation, with precise control over pulse timing, duration, and amplitude. By optimizing these parameters to match the betatron's resonant frequency and acceleration requirements, the system achieves high charge trapping efficiency only when necessary, significantly reducing overall power loss while maintaining reliable electron acceleration in compact devices.
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 design significantly enhances the radiation output of small diameter betatrons by improving charge trapping efficiency and reducing power loss, making them suitable for formation evaluation in oil well borehole logging applications.
Implementation Method 1
the inductive means having an injection coil wound around an inside portion of a vacuum chamber wall of the vacuum chamber
Implementation Method 2
electrons are accelerated on a circular path by a varying magnetic field
Implementation Method 3
The interaction of the electrons with the target leads to the emission of Bremsstrahlung and characteristic x-rays of the target material
Data Source
AI summary
A betatron magnet, the betatron magnet comprising at least one electron injector positioned approximate an inside of a radius of an betatron orbit, such that electrons are injected into the betatron orbit with the at least one electron injector positioned within an electron acceleration passageway, whereby the electron acceleration passageway is located within a vacuum chamber; and wherein the at least one electron injector is driven with an inductive means.