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  Excitation and Propagation of Alfvén Waves in a Helicon Discharge

Grulke, O., Franck, C. M., & Klinger, T. (2003). Excitation and Propagation of Alfvén Waves in a Helicon Discharge. In I. Falconer Dewar R.L., & J. Khachan (Eds.), Plasma Physics. 11th International Congress on Plasma Physics: ICPP2002 (pp. 412-415). Melville,NY: American Institute of Physics.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3DEB-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3DEC-8
Genre: Book Chapter

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 Creators:
Grulke, O.1, 2, Author              
Franck, C. M.2, Author              
Klinger, T.1, 2, Author              
Affiliations:
1VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
2Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              

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Free keywords: 11th International Congress on Plasma Physics: ICPP2002, Sydney, 2002-07-15 to 2002-07-19
 Abstract: An experimental study of shear Alfvén waves in a linearly magnetized plasma is presented. Shear Alfvén waves are electromagnetic waves propagating parallel to the background magnetic field without compression of the plasma at a frequency well below the ion cyclotron frequency and a wavelength inversely proportional to the square root of the plasma density. A basic condition on laboratory investigations is that the Alfvén wavelength must be significantly smaller than the device dimension. This makes Alfvén waves difficult to investigate in laboratory experiments and most studies are performed in space, where typical Alfvén wavelengths of several kilometers are observed. The results of these studies are often ambiguous due to difficulties concerning the measurements of plasma parameters and the magnetic field geometry. The primary motivation for the present paper is the investigation of Alfvén wave propagation in a well defined laboratory situation. The experiments are conducted in the linear VINETA device. The necessary operational regime is achieved by the large axial device length of 4.5m and the use of a helicon plasma source providing high density plasmas with ionization degrees of up to 100%. The Argon plasma is magnetized by a set of 36 magnetic field coils, which produce a maximum magnetic field of 0.1T on the device axis. With this configuration a plasma-β of ≥ 10–4 is achieved, which exceeds the electron to ion mass ration, and the ion cyclotron frequency is [approximate] 250kHz. Langmuir probes provide detailed informations on the time-averaged plasma profiles. Magnetic field perturbations for the excitation of Alfvén waves are generated by a current loop, which is introduced into the plasma. The surface normal of the current loop is directed perpendicular to the magnetic field. The waves's dispersion relation in dependence of plasma parameters is determined by spatially resolved B-dot probe measurements.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 65207
URI: http://dx.doi.org/10.1063/1.1593953
 Degree: -

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Title: Plasma Physics. 11th International Congress on Plasma Physics: ICPP2002
Source Genre: Book
 Creator(s):
Falconer Dewar R.L., I.A., Editor
Khachan, J., Editor
Affiliations:
-
Publ. Info: Melville,NY : American Institute of Physics
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 412 - 415 Identifier: -

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Title: AIP Conference Proceedings
Source Genre: Series
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Pages: - Volume / Issue: 669 Sequence Number: - Start / End Page: - Identifier: -