Silicon Drift X-Ray Detection for Picosecond Temporal Resolution
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Solution Overview
Problem
Current solid-state X-ray detection systems face limitations in achieving both high spatial and temporal resolution, with vacuum tube streak cameras offering superior temporal resolution but being costly, large, and difficult to maintain, while solid-state detectors provide spatial resolution but only millisecond temporal resolution.
Innovation Solution
The development of a solid-state X-ray pulse detection system using a silicon drift detector (SDD) with a series of cathode strips on both sides of a semiconductor chip, applying specific voltage profiles to create a linear electric field, allowing electron clouds generated by X-ray pulses to drift and spread, enabling high temporal resolution by converting time-domain signals into spatial information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vacuum tube streak cameras are used to achieve high temporal resolution, then temporal resolution is improved, but device complexity, cost, and maintenance difficulty increase
Solution Approach 1:
The patent replaces the vacuum tube mechanical system with a solid-state semiconductor detector system. The semiconductor detector uses electric fields to control electron drift and achieve temporal resolution without requiring vacuum tubes, mechanical moving parts, or complex vacuum systems, thereby simplifying the overall device complexity while maintaining high temporal resolution capability
Solution Approach 2:
The patent changes the operating parameters by using variable voltage applied to drift cathode strips to create time-varying electric fields. This allows the system to achieve high temporal resolution through controlled electron drift velocities and flight times, replacing the need for complex vacuum tube timing mechanisms with simpler voltage control parameters
2Measurement precision
If vacuum tube streak cameras are used to achieve high temporal resolution, then temporal resolution is improved, but device size and cost increase
Solution Approach 1:
The patent replaces the bulky vacuum tube system with a compact solid-state semiconductor detector that can be fabricated using standard semiconductor manufacturing processes. This substitution dramatically reduces device size while achieving comparable or superior temporal resolution, as solid-state devices are inherently more compact than vacuum tube systems
Solution Approach 2:
The patent uses parameter optimization in the semiconductor material and device structure (such as drift region thickness, doping concentrations, and electrode geometry) to achieve high temporal resolution in a compact form factor, eliminating the need for large vacuum tube assemblies
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 achieves temporal resolution in the 10 ps range, providing a cost-effective, scalable alternative to vacuum tube streak cameras with improved flexibility for ultrafast detection and imaging, while maintaining high spatial resolution and energy resolution capabilities.
Implementation Method 1
receiving an X-ray pulse in a semiconductor chip comprising a bulk material resulting in an electron cloud being formed in the semiconductor chip
Implementation Method 2
applying a second set of voltages to across the first and the second plurality of drift cathode strips to form an electric field having a linear profile to cause the electron cloud to drift along the middle of the semiconductor chip
Data Source
AI summary
Devices, systems and methods for solid-state X-ray detection with high temporal resolution are described. An example method includes receiving an X-ray pulse in a semiconductor chip resulting in an electron cloud being formed in the semiconductor chip, applying a first set of voltages across a first plurality of drift cathode strips on a first side of the semiconductor chip and a second plurality of drift cathode strips on a second side of the semiconductor chip, applying a second set of voltages to across the first and the second plurality of drift cathode strips to form an electric field having a linear profile to cause the electron cloud to drift along the middle of the semiconductor chip, and activating a counter cathode on the second side and one or more readout anodes on the first side to collect the electron cloud after spreading in the middle section of the semiconductor chip.