Wehnelt-Regulated Electron Beam Injector for Stable Beam Focus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Charged particle beams used in radiation generators for downhole well-logging tools often suffer from inconsistent radiation generation due to unregulated intensity and focus, leading to beam instabilities and inaccurate geological measurements.
Innovation Solution
A beam injector system with a cathode emitter and a Wehnelt electrode, coupled with a resistor, self-regulates the voltage potential based on the electron beam current to maintain consistent beam focus and minimize current surges, using a Wehnelt resistor to adjust the Wehnelt potential and stabilize the electron beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intensity and focus of the electron beam are not regulated, then the device complexity is reduced, but the radiation generation becomes inconsistent and beam instabilities occur
Solution Approach 1:
The patent implements self-regulation of the electron beam intensity and focus through the interaction between the Wehnelt electrode and the electron beam itself. The beam current automatically adjusts the Wehnelt potential, creating a feedback mechanism that maintains consistent radiation generation without requiring external regulation systems.
Solution Approach 2:
The patent employs a feedback mechanism where the electron beam current influences the Wehnelt electrode potential, which in turn regulates the beam intensity and focus. This automatic feedback loop ensures consistent radiation generation by continuously adjusting beam parameters based on actual beam conditions.
2Productivity
If the electron beam intensity is increased to improve productivity, then the radiation generation efficiency is improved, but beam instabilities and charging up of internal insulators occur
Solution Approach 1:
The feedback mechanism through the Wehnelt electrode automatically adjusts the beam intensity based on beam current conditions. When beam current increases, the Wehnelt potential adjusts to prevent excessive intensity that would cause instabilities, thereby maintaining reliable operation at high productivity levels.
Solution Approach 2:
The patent dynamically changes the Wehnelt electrode potential parameter in response to beam current variations. This parameter adjustment allows the system to optimize radiation generation efficiency while preventing beam instabilities by keeping the beam intensity within stable operating ranges.
3Manufacturing precision
If the Wehnelt potential is adjusted to improve beam focus, then the manufacturing precision of the beam is improved, but the device complexity increases
Solution Approach 1:
The Wehnelt electrode system performs self-regulation of beam focus through the natural interaction between the electron beam and the electrode. The beam current automatically modifies the Wehnelt potential, eliminating the need for complex external focus adjustment mechanisms while achieving precise beam focus.
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
The solution ensures a stable and focused electron beam, reducing beam instabilities and enhancing the accuracy of geological measurements by maintaining consistent radiation generation and beam optics, thereby improving the precision of hydrocarbon resource detection and geological formation analysis.
Implementation Method 1
a cathode emitter to emit electrons
Implementation Method 2
an electrode to bias at least a portion of the electrons to remain on the cathode emitter and focus the emitted electrons into an electron beam
Data Source
AI summary
A beam injector may include a cathode emitter to emit electrons and an electrode to bias at least a portion of the electrons to remain on the cathode emitter and focus the emitted electrons into an electron beam. The beam injector may also include a resistor coupled between the cathode emitter and the electrode and configured to allow self-regulation of a voltage potential on the electrode based at least in part on a current of the electron beam.