Position linearity analysis of circular arc terminated resistive anode using finite element method for...

Area of Science:

• Physics
• Electrical Engineering
• Detector Technology

Background:

• Resistive anodes are crucial for position-sensitive detectors.
• Understanding charge diffusion dynamics is key to improving spatial resolution.
• Circular arc termination offers unique properties for anode design.

Purpose of the Study:

• To develop a comprehensive finite element model for circular arc terminated (CAT) resistive anodes.
• To investigate the dynamic process of charge diffusion and its impact on position linearity performance.
• To analyze the influence of various electrical parameters on anode linearity.

Main Methods:

• Finite element method (FEM) modeling of the CAT resistive anode.
• Calculation of electrode charge waveforms for varying electrical parameters.
• Analysis of signal development time and anode resistance non-uniformity effects.

Main Results:

• Image non-linearity varies monotonically with termination resistance and resistance non-uniformity.
• Non-linearity shows a non-linear relationship with signal development time and resistance ratio.
• Achieved root-mean-squared non-linearity of 2% with optimal parameters and sufficient signal collection time (0.6R▱c s).

Conclusions:

• The developed FEM model accurately predicts CAT resistive anode performance.
• Simulation results were validated through experimental measurements.
• Optimized CAT resistive anodes can achieve high position linearity for imaging applications.