Helicon wave excitation and propagation in a toroidal heliac: Experiment and theory

Zhang, B. C.; Borg, G. G.; Blackwell, B. D.

doi:10.1063/1.871432

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…In Australia, helicons were also used to create the plasma in toroidal fusion experiments [104,105]. A new large helicon source, MAGPIE, has been built at ANU, and Chang et al [106] have separately controlled and measured the radial and axial profiles of the plasma and the waves.…”

Section: Experiments By Othersmentioning

confidence: 99%

Helicon discharges and sources: a review

Chen

2015

Plasma Sources Sci. Technol.

207

158

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Helicon waves are waves in low-temperature, partially ionized plasmas in a dc magnetic field (B-field). The study of helicons involves both ion-neutral collisions and Larmor orbits, even when the B-field is uniform. Helicon discharges are ionized by helicon waves generated by a radiofrequency (RF) antenna. Interest in helicon discharges arose because of the high plasma densities they generate compared with other RF sources at comparable powers. The semiconductor industry has not taken advantage of this, even since the possible use of permanent magnets for the B-field has been demonstrated. Nonetheless, a large literature on helicons has evolved because of the numerous problems these discharges posed and the interesting physics found in their solutions.

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Section: Experiments By Othersmentioning

confidence: 99%

Helicon discharges and sources: a review

Chen

2015

Plasma Sources Sci. Technol.

207

158

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“…The beat pattern is still observable on the B field here, but is less evident than for E r , a property which holds for all antennas. Another fact worth noting is that due to the complicated relation between the axial component of the Poynting flux carried by a wave and its mode numbers, 24 the copropagating beat waves are observable, even though the ͕mϭ0, N r ϭ1͖ mode carries most of the rf power. Figure 15 shows the axial profiles of B r and B , and Fig.…”

Section: Wave Field Profilesmentioning

confidence: 99%

“…This code has been bench-marked by a uniform plasma filled waveguide code based on Bessel function solutions to the above wave equations. 24 …”

Section: Appendix A: Fourier-transforms Of Antenna Currentsmentioning

confidence: 99%

An evaluation of different antenna designs for helicon wave excitation in a cylindrical plasma source

Kamenski

Borg

1996

Physics of Plasmas

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Articles you may be interested inA segmented multi-loop antenna for selective excitation of azimuthal mode number in a helicon plasma source Rev. Sci. Instrum. 85, 093509 (2014); 10.1063/1.4896041 Towards an optimal antenna for helicon waves excitation J. Appl. Phys. 98, 083304 (2005); 10.1063/1.2081107Measurements and code comparison of wave dispersion and antenna radiation resistance for helicon waves in a high density cylindrical plasma source A magnetohydrodynamic numerical model, based on the finite element method, is employed to analyze the antenna radiation resistance in a cylindrical helicon wave driven plasma source. The antenna radiation resistances of four commonly used antennas are compared. The effects on antenna radiation resistance of frequency, plasma density, density profile and the system dimensions are investigated. It is confirmed that mϭϩ1 is the most strongly excited mode. It is shown that the plasma density gradient tends to suppress the excitation of negative m-modes. Some wave field patterns are also presented which demonstrate commonly observed features in the experiments such as the beat patterns of copropagating radial modes. The findings highlight the importance of antenna radiation resistance modelling as a first step to a self consistent model of the discharge physics of cool dense helicon wave driven sources.

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“…Around 0.5 T, corresponding fundamental ion cyclotron frequency of the hydrogen is about 7 MHz. It is in the range of helicon plasma wave for the injection RF frequency of 30 MHz [9]. It is well known that helicon wave produces high density plasma in the low temperature processing plasma so that the higher density on the lower B TF at ICRF-DC plasmas may be due to the helicon wave generation.…”

Section: Glow Discharge Cleaning (Gdc) and Icrf-dcmentioning

confidence: 99%