Compact High-Voltage Supply Layout for Radiation Generators
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Solution Overview
Problem
Current electronic radiation generators for oilfield applications are limited by their large size, which restricts detector placement and measurement capabilities due to the lengthy high voltage power supply, necessitating a compact design to facilitate multiple and optimal detector positions.
Innovation Solution
A compact pulsed neutron generator design is achieved by collocating the linear high voltage power supply with the neutron generator tube and employing innovative configurations such as external step-up transformers, 'split-and-flip' voltage multipliers, and fold-back high voltage supplies to reduce overall length and electrical stress, while using insulating materials like Aluminum nitride for heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional linear high voltage power supply is used, then sufficient high voltage is produced for radiation generation, but the device becomes too large for optimal detector placement
Solution Approach 1:
The patent transitions from a linear one-dimensional power supply layout to a three-dimensional folded configuration. The voltage multiplier stages are arranged in a folded pattern that utilizes vertical and lateral space, reducing the overall length while maintaining the required voltage multiplication function. This dimensional reorganization allows compact integration with the radiation source while preserving electrical performance.
Solution Approach 2:
The power supply components are nested within a compact housing structure. The voltage multiplier stages are integrated into the same housing as the radiation source, with components arranged concentrically or in nested configurations. This nesting approach maximizes space utilization and reduces the overall device footprint, enabling flexible detector placement around the compact assembly.
2Length of stationary object
If the high voltage power supply is shortened for compactness, then detector placement is improved, but electrical stress and insulation requirements become more challenging
Solution Approach 1:
The patent applies different insulation materials and structural configurations to different regions of the compact power supply. High-dielectric-strength materials are positioned in areas of highest electrical stress, while lighter materials are used in lower-stress regions. This localized optimization maintains electrical integrity in the compact design without uniformly increasing material usage or device size.
Solution Approach 2:
The patent employs composite insulation structures combining multiple materials with complementary properties. For example, ceramic insulators are combined with polymer coatings or metal shields to achieve both high electrical strength and compact dimensions. These composite structures provide the necessary electrical stress resistance in a reduced size, enabling the shortened power supply design to meet safety and performance requirements.
3Duration of action of stationary object
If radioactive sources are used for neutron generation, then continuous radiation is achieved, but radiation safety and disposal costs increase
Solution Approach 1:
The patent employs a pulsed electron beam system that accelerates electrons in periodic bursts toward the target. This periodic acceleration produces neutron radiation only during the pulse intervals, enabling controlled on-demand radiation generation. The system includes pulse generation circuitry and beam modulation mechanisms that switch the electron flow on and off, providing safety control while maintaining the ability to generate radiation when needed for measurement applications.
Solution Approach 2:
The system incorporates automatic safety interlocks and monitoring that allow the radiation generator to self-regulate operation. Sensors detect radiation levels, beam current, and system status, automatically adjusting or shutting down the electron beam when safety thresholds are approached. This self-service safety mechanism reduces the need for external monitoring and manual intervention, addressing radiation safety concerns while maintaining operational continuity.
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 compact design allows for improved placement of detectors around the radiation source, enhancing measurement capabilities and reducing the tool's size constraints, while maintaining reliable operation at elevated temperatures through effective heat dissipation.
Implementation Method 1
Linear accelerators operate by creating a sufficiently large voltage difference between a source of charged particles and a target. Once the source is turned ON, charged particles entering the region of high voltage (HV) are accelerated to the predetermined desired energy
Implementation Method 2
A common power supply design employed is based on the Cockcroft-Walton voltage multiplier, also known as the Greinacher multiplier. Such a voltage multiplier includes an array of stages in series, shaped like a ladder, with each stage comprising a pair of capacitors and a pair of diodes
Implementation Method 3
using insulating materials like Aluminum nitride for heat management
Data Source
AI summary
Disclosed is a radiation logging tool, comprising a tool housing; a compact generator that produces radiation; a power supply coupled to the compact generator; and control circuitry. Embodiments of the compact generator comprise a generator vacuum tube comprising a source generating charged particles, and a target onto which the charged particles are directed; and a high voltage supply comprising a high voltage multiplier ladder located laterally adjacent to the generator vacuum tube. The high voltage supply applies a high voltage between the source and the target to accelerate the charged particles to a predetermined energy level. The compact generator also includes an electrical coupling between an output of the high voltage supply and the target of the generator vacuum tube to accommodate the collocated positions of the generator vacuum tube and the high voltage power supply.