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- Q4135014 subject Q6273140.
- Q4135014 abstract "A helicon is a low frequency electromagnetic wave that can exist in plasmas in the presence of a magnetic field. The first helicons observed were atmospheric whistlers, but they also exist in solid conductors or any other electromagnetic plasma.Helicons have the special ability to propagate through pure metals, given conditions of low temperature and high magnetic fields. Most electromagnetic waves in a normal conductor are not able to do this, since the high conductivity of metals (due to their free electrons) acts to screen out the electromagnetic field. Indeed, normally an electromagnetic wave would experience a very thin skin depth in a metal: the electric or magnetic fields are quickly reflected upon trying to enter the metal. (Hence the shine of metals.) However, skin depth depends on an inverse proportionality to the square root of angular frequency. Thus a low frequency electromagnetic wave may be able to overcome the skin depth problem, and thereby propagate throughout the material.A helicon discharge is an excitation of plasma by helicon waves induced through radio frequency heating. The difference between a helicon plasma source and an inductively coupled plasma is the presence of a magnetic field directed along the axis of the antenna. The presence of this magnetic field creates a helicon mode of operation with higher ionization efficiency and greater electron density than a typical ICP. The Australian National University, in Canberra, Australia, is currently researching applications for this technology. A commercially developed magnetoplasmadynamic engine called VASIMR also uses helicon discharge for generation of plasma in its engine. Potentially, Helicon Double Layer Thruster plasma based rockets are suitable for interplanetary travel.".
- Q4135014 wikiPageWikiLink Q10251.
- Q4135014 wikiPageWikiLink Q10656.
- Q4135014 wikiPageWikiLink Q1094.
- Q4135014 wikiPageWikiLink Q11386.
- Q4135014 wikiPageWikiLink Q1203476.
- Q4135014 wikiPageWikiLink Q1815425.
- Q4135014 wikiPageWikiLink Q235195.
- Q4135014 wikiPageWikiLink Q2454436.
- Q4135014 wikiPageWikiLink Q466500.
- Q4135014 wikiPageWikiLink Q5705102.
- Q4135014 wikiPageWikiLink Q58347.
- Q4135014 wikiPageWikiLink Q6273140.
- Q4135014 wikiPageWikiLink Q664150.
- Q4135014 comment "A helicon is a low frequency electromagnetic wave that can exist in plasmas in the presence of a magnetic field. The first helicons observed were atmospheric whistlers, but they also exist in solid conductors or any other electromagnetic plasma.Helicons have the special ability to propagate through pure metals, given conditions of low temperature and high magnetic fields.".
- Q4135014 label "Helicon (physics)".