Helicon Plasma Discharge in a Toroidal Magnetic Field of the Tokamak

Chen, Jin; Yu, Tianqi; Zhao, Yan; Bo, Yunxuan; Ye, C.; Hu, Jiansheng; Zhuge, Lanjian; Ge, Shuibing; Wu, Xuemei; Ji, Hantao; Li, J. G.

doi:10.1109/tps.2011.2161344

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…The knowledge of forces and moments caused by this particular configuration of the magnetic field can be advantageous when searching for new configurations of electrical machines with high efficiency. In addition, the model illustrated can be useful to study the force applied to the conductors of machines like tokamaks and similar ones [7][8][9][10][11][12][13][14][15][16][17][18]. All the numerical computations of the present study have been performed by using the software MATHEMATICA 10.3 [31].…”

Section: Discussionmentioning

confidence: 99%

“…Actually, the model for the computation of forces and moments illustrated in the following also represents a starting point for a reliable analytical numerical evaluation of the external/internal actions applied to other kinds of helical toroidal system. In these systems, synchrotron light sources [7], tokamaks [8][9][10][11][12], stellarator [13][14][15][16][17], and hybrid tokamak-stellarator [18], magnetic forces are applied to electrical helicoidal coils. In order to ensure a good structural strength of such devices, these forces have to be evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Forces and Torques Generated by Toroidal Helicoidal Magnetic Fields

Muscia¹

2017

PIER B

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Abstract-In this paper, the computation of forces and torques mutually applied between a helical toroidal magnet and a magnet shaped like an angular plane sector is illustrated. The evaluation considers the magnetostatic field hypothesis. The main aim of this study is to present a tool for performing fast and accurate evaluation of forces and torques based on the method of the magnetic charges referring to helical toroidal magnetic systems. The particular geometry of the case study concerns the development of unconventional configurations of electrical machines. These configurations should reduce the magnetic flux changing during the machine operation. A small change of the magnetic flux reduces all the losses related to the flux variation. The illustrated model for the computation of forces and moments also shows a starting point for a reliable analytical numerical evaluation of the external/internal actions applied to parts of other kinds of helical toroidal systems as stellarator and similar ones.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Forces and Torques Generated by Toroidal Helicoidal Magnetic Fields

Muscia¹

2017

PIER B

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“…Helicon sources are one of the most efficient plasma sources that have been used for producing high‐density plasmas in fusion devices such as tokomaks and Inertial Electrostatic Confinement Fusion (IECF). Recently, these sources have been widely used in plasma propulsion devices such as VASIMR and plasma processing reactors .…”

Section: Introductionmentioning

confidence: 99%

The effect of Landau damping on the power absorption in a helicon plasma source driven by an m = 0 antenna

Soltani

Habibi

Zakeri-Khatir

2017

Contrib. Plasma Phys

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Landau damping is one of the most important mechanisms for the description of wave dissipation and efficient power absorption in helicon plasma sources. Numerical analysis using the MATLAB code is carried out to determine the dispersion relation of the helicon plasma and calculate the axial wavenumber for m = 0 mode in both Trivelpiece-Gould (TG) and helicon plasma density regimes. In addition, the MATLAB code is coupled to the CST Microwave Studio (Ms) code to examine the collisionless power absorption due to Landau damping in a helicon source driven by a single-loop antenna. The effects of some parameters, such as the electron temperature (T e ), the external magnetic field strength (B 0 ), and the antenna excitation frequency (f ), on the Landau damping are investigated for electron density ranging from 1 × 10 16 to 1 × 10 20 m -3 . Our findings indicate that, for a given set of plasma parameters, Landau damping shows different behaviors on the power deposition. For instance, increasing the excitation frequency has considerable effect on the collisionless absorbed power in the range of values from 3 × 10 17 to 3 × 10 19 m -3 of the electron density. Also, for f = 13.56 MHz, T e = 3 eV, and B 0 = 100 G, there is a specific electron density (i.e., n e = 2 × 10 18 m -3 ) beyond which increasing the electron temperature causes a decrease in the collisionless power absorption; the opposite is true for lower plasma density (i.e., n e < 2 × 10 18 m -3 ). Furthermore, the obtained results show that Landau damping has considerable effect on the power absorption in the helicon source at low pressure regime (e.g., P = 1 mTorr) with low external magnetic field strength (e.g., B 0 < 200 G).

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“…A strong field is expected to contribute to the better plasma confinement across the field, which would lead to a more efficient plasma production. So far, helicon discharges of more than several kG have been reported rarely [15,16], and so HWP performance above this field should be investigated.…”

Section: Introductionmentioning

confidence: 99%

Helicon Plasma Discharge for Processing Wall Material

Huang¹,

Chen²,

Wu³

et al. 2014

AMM

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A helicon wave plasma (HWP) discharge with strong magnetic field was investigated. The HWP was produced with an internal Nagoya III antenna that is perpendicular to the magnetic field and driven by a 13.56 MHz radio-frequency (RF) source. HWP was characterized in terms of electron density, electron temperature and plasma potential using a single Langmuir probe in Ar gas. The result of Langmuir probe shows that the electron density increases with RF power, but saturate above 700 W at a density of 2×1019m-3. Scanning electron microscopy (SEM) was extensively used to characterize the quality of the graphite surface. The result of SEM shows the surface of graphite that exposed to plasma processing has exhibited smoother and compacter surface topography. Meanwhile, the concentration of impurity on the graphite surface decreases with plasma processing.

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Helicon Plasma Discharge in a Toroidal Magnetic Field of the Tokamak

Cited by 11 publications

References 22 publications

Evaluation of Forces and Torques Generated by Toroidal Helicoidal Magnetic Fields

Evaluation of Forces and Torques Generated by Toroidal Helicoidal Magnetic Fields

The effect of Landau damping on the power absorption in a helicon plasma source driven by an m = 0 antenna

Helicon Plasma Discharge for Processing Wall Material

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