Helicon antenna radiation patterns in a high-density hydrogen linear plasma device

Caneses, J. F.; Blackwell, B. D.; Piotrowicz, P.

doi:10.1063/1.5000848

Title: Helicon antenna radiation patterns in a high-density hydrogen linear plasma device

Journal Article · Tue Nov 14 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5000848· OSTI ID:1649663

^[1]; Blackwell, B. D. ^[2]; Piotrowicz, P. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Australian National Univ., Canberra, ACT (Australia)
Australian National Univ., Canberra, ACT (Australia)
Univ. of Illinois at Urbana-Champaign, IL (United States)

Antenna radiation patterns in the vicinity of a helicon antenna are investigated in hydrogen plasmas produced in the MAGPIE linear plasma device. Using a uniform cold-plasma full-wave code, we model the wave physics in MAGPIE and find good agreement with experimental wave measurements. In this work, we show for the first time which antenna elements in a helicon device couple most strongly to the plasma and discuss the physical mechanism that determines this effect. Helicon wavefields in the near field of the antenna are best described in terms of the group velocity and ray direction, while far from the antenna, helicon wavefields behave like plane waves and are best described in terms of eigen-modes. In addition, we present recent 2D axis-symmetric full-wave simulations of the 120 kW helicon source in ProtoMPEX ($$n_e$$ ~ 5 × 10¹⁹ m^-3, $$B_0$$ ~ 70 mT, and $$\textit{f}$$ = 13.56 MHz) where the antenna radiation patterns are evident, and we provide an interpretation of the numerical results using the ideas developed in this paper.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649663

Alternate ID(s):: OSTI ID: 1420634

Journal Information:: Physics of Plasmas, Vol. 24, Issue 11; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Helicon normal modes in Proto-MPEX Piotrowicz, P. A.; Caneses, J. F.; Green, D. L. Plasma Sources Science and Technology, Vol. 27, Issue 5 https://doi.org/10.1088/1361-6595/aabd62	journal	May 2018
Differential pumping requirements for the light-ion helicon source and heating systems of Proto-MPEX Caneses, J. F.; Piotrowicz, P. A.; Biewer, T. M. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5001519	journal	August 2018
Plasma flow measurements in the Prototype-Material Plasma Exposure eXperiment (Proto-MPEX) and comparison with B2.5-Eirene modeling Kafle, N.; Owen, L. W.; Caneses, J. F. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5019266	journal	May 2018
High density negative hydrogen ion production in a high power pulsed helicon discharge Santoso, Jesse; Willett, Hannah V.; Corr, Cormac S. Plasma Sources Science and Technology, Vol. 27, Issue 10 https://doi.org/10.1088/1361-6595/aae705	journal	October 2018
Magnetic field configurational study on a helicon-based plasma source for future neutral beam systems Ahmed, Kamal M.; Agnello, Riccardo; Béchu, Stéphane Plasma Sources Science and Technology, Vol. 28, Issue 9 https://doi.org/10.1088/1361-6595/ab3705	journal	September 2019
Microwave excitation of a low-energy atomic hydrogen Shimabukuro, Yuji; Takahashi, Hidenori; Iwamoto, Shinichi Plasma Sources Science and Technology, Vol. 29, Issue 1 https://doi.org/10.1088/1361-6595/ab5e60	journal	January 2020

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Title: Helicon antenna radiation patterns in a high-density hydrogen linear plasma device

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