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M Li¹, W Xiang, K X Xiao

¹Institute of Electric Engineering, China Academy of Engineering Physics, P.O. Box 919-518, Mianyang 621900, China. lim999@foxmail.com

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|March 3, 2012

Summary

This study measured ion current profiles from a cold cathode Penning ion source using a Langmuir probe. Results show the ion current distribution is axially symmetric and unimodal, offering insights into ion beam characteristics.

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Area of Science:

Plasma Physics
Ion Source Technology

Background:

Penning ion sources are crucial for generating ion beams.
Understanding ion current distribution is vital for optimizing beam extraction and transport.

Purpose of the Study:

To measure the total current and 2D ion current profile of a cold cathode Penning ion source.
To investigate the effect of bias voltage on ion current dynamics.

Main Methods:

Employed a paralleled plate electrode and a 9-tip Langmuir probe array.
Operated the ion source with a 500 V DC power supply.
Applied bias voltages from -200 V to 200 V to the electrode and probe array.

Main Results:

The total ion current and its 2D profile were measured.
Ion current distribution exhibited axial symmetry.
The distribution closely approximated a unimodal pattern.

Conclusions:

The study successfully characterized the ion current profile of the Penning ion source.
Axial symmetry and unimodal distribution were confirmed, providing valuable data for source optimization.