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Journal Article

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

MPS-Authors
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Grulke,  O.
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110559

Stark,  A.
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110803

Windisch,  T.
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109625

Klinger,  T.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;
Office of the Director (DI), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-0579-E
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.