Superiority of half-wavelength helicon antennae

Porte, L.; Yun, Seok‐Min; Arnush, Donald; Chen, F F

doi:10.1088/0963-0252/12/2/320

Cited by 19 publications

(11 citation statements)

References 34 publications

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“…It would seem reasonable that a full-wavelength helical antenna would have a narrower spectrum and would couple better to the plasma than the usual half-wavelength antenna. But it was found [130] (figure 32) that the opposite is true. This has not yet been explained.…”

Section: Conundrums and Insightsmentioning

confidence: 97%

Helicon discharges and sources: a review

Chen

2015

Plasma Sources Sci. Technol.

205

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: Conundrums and Insightsmentioning

confidence: 97%

Helicon discharges and sources: a review

Chen

2015

Plasma Sources Sci. Technol.

205

158

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“…The perpendicular wave number depends only on the radius of the cylindrical discharge channel and the parallel wave number can be set by a proper antenna choice. 29 Thus, for a system that fixes the RF frequency and the wave number, the density is proportional to the magnetic field strength, a result that has been validated often in experiments. 27,30 …”

Section: Helicon Thrustersmentioning

confidence: 87%

New Low-Power Plasma Thruster for Nanosatellites

Sheehan¹,

Collard

Longmier

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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The CubeSat Ambipolar Thruster is a new, electrodeless, permanent magnet, helicon thruster specifically designed for the constraints of a nanosatellite. The design processes is outlined, indicating expected thrust, Isp, and efficiency of ∼ 1 mN, ∼ 1000 s, and 20%, respectively. The major components of the thruster-quartz plasma liner, helical half-twist antenna, permanent magnets, and Faraday shield-are described. Finite element magnetic field simulations were compared to magnetometer measurements of the prototype device and showed agreement to within 5%. Initial testing on xenon demonstrated ignition at < 50 W. The electrodeless design enables the use of a wide variety of propellants and a discussion of iodine's potential as a propellant is included.

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“…The design performed by AMPICP model, was evaluated using power balance model (as seen in figure 11). The plasma parameters used in simulation at 0.02 mbar argon pressure for 19.7 A peak RF coil current are T e = 4.0 eV, T n = 583 K and C D−M = 8.8×10 4 . T e , T n and C D−M are electron temperature, neutral gas temperature and Exponential Factor of transition point between Druyvesteyn and Maxwellian EEDFs, respectively.…”

Section: Simulation and Optimization Of The Em Fields Using The Ampic...mentioning

confidence: 99%

“…The RF power applied to an external planar coil is transferred to the gas through a dielectric window in the form of an inductive electric field. The generated plasma in ISTAPHM simulator by an external plasma source potentially should be able to reach a W-mode [4][5][6][7][8]. The working gas pressures are very low (typically <50 mTorr) while, the electron densities are relatively high (>10 17 m −3 ) [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of an ICP reactor with planar antenna as a driver in ISTAPHM and validation of AMPICP model

Ghanei

Nasrabadi

2019

J. Inst.

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The present work is related to the method for designing a driver for low pressure plasma sources using the AMPICP model. Particularly, it is related to equipment for producing plasma, which can be used for driver of the simulator project (ISTAPHM) of the interactions between ICRF antenna and plasma on Tokamak Nuclear Fusion Reactors. Here, two important aspects of this modeling are discussed: firstly, optimization of geometrical parameters for driver of source plasma in ISTAPHM and secondly, Simulation and computation of the EM fields adjusted for a planar antenna (PA) of driver. The work is focused on the characterization of low pressure Inductively Coupled Plasma (ICP) source and the features of a helicon chamber. Numerical simulations of ICP with PA were presented to optimize the plasma characteristics. The results of the AMPICP model for designing of ICP reactor as the driver in ISTAPHM were also evaluated using the power balance model. This paper also presents a two dimensional simulation for the EM field inside the ICP reactor for homogeneous plasma and compares the optimized and laboratory results with each other. From the measurements of the magnetic field inside the reactor using a magnetic probe, the electron number density and effective collision frequency can be estimated. The form of magnetic field lines inside the vessel was investigated and theoretical field lines were presented in the paper. The results of analyses as a function of operating parameters were presented to be measured with fixed and movable Langmuir probes. Optical Emission Spectra were recorded for different gas flow rates and filling pressures at constant power level by spectrometer. The variation in the intensity ratio of the selected emission lines, electron temperature and density was studied as a function of gas flow rate and filling pressure. K: Plasma diagnostics -probes; Plasma generation (laser-produced, RF, x ray-produced)1Corresponding author.

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Superiority of half-wavelength helicon antennae

Cited by 19 publications

References 34 publications

Helicon discharges and sources: a review

Helicon discharges and sources: a review

New Low-Power Plasma Thruster for Nanosatellites

Design and optimization of an ICP reactor with planar antenna as a driver in ISTAPHM and validation of AMPICP model

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