Langmuir probe study in the nonresonant current drive regime of helicon discharge |
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Authors: | Manash Kumar Paul Dhiraj Bora |
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Institution: | (1) Institute for Plasma Research, Bhat, Gandhinagar, 382 428, India |
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Abstract: | Characterization of the current drive regime is done for helicon wave-generated plasma in a torus, at a very high operating
frequency. A radiofrequency-compensated Langmuir probe is designed and used for the measurement of plasma parameters along
with the electron energy distributions in radial scans of the plasma. The electron energy distribution patterns obtained in
the operational regime suggest that Landau damping cannot be responsible for the efficient helicon discharge in the present
study. A typical peaked radial density profile, high plasma temperature and absence of an appreciable amount of energetic
electrons for resonant wave-particle interactions, suggest that the chosen operational regime is suitable for the study of
nonresonant current drive by helicon wave. Successful and significant current drive achieved in our device clearly demonstrates
the capability of nonresonant current drive by helicon waves in the present operational regime.
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Keywords: | Helicon wave radiofrequency-compensated Langmuir probe current drive regime |
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