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  Plasma profiles in a cylindrical helicon discharge with converging magnetic source field

Grulke, O., Stark, A., Windisch, T., Zalach, J., & Klinger, T. (2007). Plasma profiles in a cylindrical helicon discharge with converging magnetic source field. Contributions to Plasma Physics, 47(3), 183-189.

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 Creators:
Grulke, O.1, 2, Author              
Stark, A.1, 2, Author              
Windisch, T.1, 2, Author              
Zalach, J.3, Author              
Klinger, T.1, 2, 4, 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              
3External Organizations, ou_persistent22              
4Office of the Director (DI), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856325              

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 Abstract: Detailed Langmuir probe measurements of the plasma density, plasma potential, and electron temperature in the cylindrical helicon device VINETA are presented. The probe measurements cover the entire radial-axial plane including the helicon antenna region. Two magnetic field configurations are compared: homogeneous magnetic field in the helicon antenna region and magnetic field gradient at the transition between the antenna and the discharge chamber. It is demonstrated that the converging magnetic field leads to the formation of steep plasma density and potential increase, which is strongly correlated with the position of the maximum magnetic field gradient. No electron heating detached from the helicon source is observed. The measurements strongly suggest that the plasma profiles are the direct result of volume reduction due to magnetic field convergence, which leads to the formation of a single sheath-like layer in front of the helicon source.

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Language(s): eng - English
 Dates: 2007
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: eDoc: 297149
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Title: Contributions to Plasma Physics
Source Genre: Journal
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Publ. Info: 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Pages: - Volume / Issue: 47 (3) Sequence Number: - Start / End Page: 183 - 189 Identifier: -