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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

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Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
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Updated: May 28, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Published on: May 25, 2021

Electron current extraction from a permanent magnet waveguide plasma cathode.

B R Weatherford1, J E Foster, H Kamhawi

  • 1University of Michigan, Ann Arbor, Michigan 48109, USA. brweathe@umich.edu

The Review of Scientific Instruments
|October 7, 2011
PubMed
Summary
This summary is machine-generated.

This study explores electron cyclotron resonance plasma as a novel plasma cathode electron source. The device achieved over 4 A extraction currents without an internal antenna, enhancing operational lifespan.

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Last Updated: May 28, 2026

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Published on: July 12, 2016

Area of Science:

  • Plasma physics
  • Electron sources
  • Microwave plasma

Background:

  • Traditional plasma cathodes often use antennas that erode, limiting lifespan.
  • Electron cyclotron resonance (ECR) plasma offers a potential antenna-free solution.

Purpose of the Study:

  • Investigate ECR plasma in a waveguide as a plasma cathode electron source.
  • Evaluate extraction current capabilities and compare with theoretical estimations.

Main Methods:

  • Generated ECR plasma using external permanent magnets in a cylindrical waveguide.
  • Measured plasma bulk density and extracted electron currents.
  • Used Langmuir probes for current estimation.

Main Results:

  • Achieved overdense plasma bulk density.
  • Extracted electron currents exceeding 4 A.
  • Experimental currents closely matched Langmuir probe estimations.

Conclusions:

  • ECR plasma is a viable antenna-free electron source.
  • The device demonstrates high extraction current potential.
  • Further analysis of facility effects and trace ionization is warranted.