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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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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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A new large area lanthanum hexaboride plasma source.

C M Cooper1, W Gekelman, P Pribyl

  • 1University of California, Los Angeles, California 90095, USA.

The Review of Scientific Instruments
|September 7, 2010
PubMed
Summary
This summary is machine-generated.

A new lanthanum hexaboride (LaB(6)) plasma source generates large-scale magnetized plasmas for fusion research. This pulsed dc discharge system creates stable, current-free plasma in a toroidal chamber.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Materials science

Background:

  • Development of efficient plasma sources is crucial for fusion energy.
  • Lanthanum hexaboride (LaB(6)) is a promising material for electron emission.

Purpose of the Study:

  • To develop and characterize a new large-area LaB(6) plasma source.
  • To investigate plasma generation and confinement in a toroidal chamber.

Main Methods:

  • A 18x18 cm(2) LaB(6) cathode was indirectly heated to 1750°C.
  • A pulsed dc discharge with a molybdenum anode generated a 20x20 cm(2) plasma.
  • The plasma was confined in a 2m wide, 3m tall toroidal chamber using magnetic fields.

Main Results:

  • The source produced magnetized plasmas (0.1
  • Plasma density reached n(e)<3x10(13) cm(-3) with discharge currents up to 250 A in helium.
  • The plasma followed helical paths within the toroidal chamber, confined by magnetic fields.

Conclusions:

  • The developed LaB(6) plasma source is capable of generating large-scale, magnetized plasmas suitable for fusion applications.
  • The pulsed operation and magnetic confinement in the toroidal chamber demonstrate a viable approach for current-free plasma generation.