Experimental measurements taken in a large magnetoplasma show that a simple double half‐turn antenna will excite m=1 helicon waves with wavelengths from 10–60 cm. Increased ionization in the center of the downstream plasma is measured when the axial wavelength of the helicon wave becomes less than the characteristic length of the system, typically 50–100 cm. A sharp maximum in the plasma density downstream from the source is measured for a magnetic field of 50 G, where the helicon wave phase velocity is about 3×108 cm s−1. Transport of energy away from the source to the downstream region must occur to create the hot electrons needed for the increased ionization. A simple model shows that electrons in a Maxwellian distribution most likely to ionize for these experimental conditions also have a velocity of around 3×108 cm s−1. This strong correlation suggests that the helicon wave is trapping electrons in the Maxwellian distribution with velocities somewhat slower than the wave and accelerating them into a quasibeam with velocity somewhat faster than the wave. The nonlinear increase in central density downstream as the power is increased for helicon waves with phase velocities close to the optimum electron velocity for ionization lends support to this idea.
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July 1996
Research Article|
July 01 1996
Plasma production from helicon waves
A. W. Degeling;
A. W. Degeling
Space Plasma & Plasma Processing Group, Plasma Research Laboratory, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia
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C. O. Jung;
C. O. Jung
Space Plasma & Plasma Processing Group, Plasma Research Laboratory, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia
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R. W. Boswell;
R. W. Boswell
Space Plasma & Plasma Processing Group, Plasma Research Laboratory, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia
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A. R. Ellingboe
A. R. Ellingboe
Space Plasma & Plasma Processing Group, Plasma Research Laboratory, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia
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Phys. Plasmas 3, 2788–2796 (1996)
Article history
Received:
October 13 1995
Accepted:
March 15 1996
Citation
A. W. Degeling, C. O. Jung, R. W. Boswell, A. R. Ellingboe; Plasma production from helicon waves. Phys. Plasmas 1 July 1996; 3 (7): 2788–2796. https://doi.org/10.1063/1.871712
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