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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

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Spatial charge cloud size of microchannel plates.

M Saito¹, Y Saito, K Asamura

¹Institute of Space and Astronautical Science, Kanagawa 229-8510, Japan. msaito@stp.isas.jaxa.jp

The Review of Scientific Instruments

|June 21, 2007

Summary

We modeled and experimentally measured the spatial evolution of charge clouds from microchannel plates (MCPs). Results show cloud size depends on MCP voltage and distance, crucial for optimizing position sensing systems.

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Area of Science:

Physics
Electronics
Instrumentation

Background:

Microchannel plates (MCPs) are essential for detecting charged particles.
Understanding charge cloud expansion is critical for high-resolution imaging and sensing.

Purpose of the Study:

To model the spatial evolution of charge clouds emitted by MCPs.
To experimentally validate the model and measure charge cloud radius.
To derive an expression for optimizing MCP-based position sensing systems.

Main Methods:

Developed a theoretical model for charge cloud spatial evolution.
Implemented an experimental method assuming Gaussian radial charge distribution.
Measured charge cloud radius as a function of acceleration voltage, MCP-anode distance, and MCP bias voltage.

Main Results:

Charge cloud size increases with distance from the MCP due to electron divergence and space charge effects.
Experimental results closely match the developed model.
Derived an approximate expression for charge cloud radius.

Conclusions:

The model accurately predicts charge cloud spatial evolution, incorporating electron divergence and space charge effects.
The derived expression aids in the practical design and optimization of MCP-based position sensing systems.