Generalized theory of helicon waves. II. Excitation and absorption

Arnush, Donald; Chen, Francis F.

doi:10.1063/1.872782

Cited by 163 publications

(182 citation statements)

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“…Numerical computations of energy deposition by coupled helicon and Trivelpiece-Gould (TG) waves [4] usually show two peaks, one near the surface due to TG absorption, and one near the axis due to helicon absorption. An example of such a bimodal energy deposition profile is shown in figure 6, calculated for a high-field discharge [11].…”

Section: Case Of Bimodal Energy Depositionmentioning

confidence: 99%

Nonlinear diffusion in magnetized discharges

Chen

1998

Plasma Sources Sci. Technol.

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Section: Case Of Bimodal Energy Depositionmentioning

confidence: 99%

Nonlinear diffusion in magnetized discharges

Chen

1998

Plasma Sources Sci. Technol.

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“…The analytical solution for a uniform plasma in cylindrical domains was obtained for the first time by Klozenberg in 1965 [1], and then generalized to the case of non-uniform plasmas by Chen and Arnush in the years 1997-2000 [2], [3], [4]. Accordingly to these models, the relevant behavior of helicons is obtained using a fluid model for electrons, satisfying the following set of equations:…”

Section: Plasma-wave Couplingmentioning

confidence: 99%

“…When the density is not uniform along the cylinder radius, the fundamental equation 5 is modified by the addition of a source term [3]. The characteristic equation associated to Eq.…”

Section: Plasma-wave Couplingmentioning

confidence: 99%

Transition from edge-localized to center-localized power deposition in helicon discharges

Curreli

2011

Eur. Phys. J. Appl. Phys.

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Abstract. In radiofrequency (RF) helicon discharges the electromagnetic power is transferred from the RF field irradiated by the antenna to the plasma medium by means of plasma-wave coupling of the electromagnetic wave with the electrons. For the common industrial frequencies of tens of MHz, and for typical pressures of few Pascals, the power deposition occurs mostly at the edge of the discharge. In these conditions, ionization and electron heating occurs in a layer close to the chamber walls, where a consistent fraction of the plasma is rapidly lost by diffusion toward the surface. The remaining fraction of plasma diffuses inward toward the center of the discharge, setting up a uniform and almost flat density profile, used in applications. A one-dimensional model considering both the plasma-wave coupling of the electrons with the RF wave and the macroscopic transport of ions and neutrals along the radial dimension of a cylindrical processing chamber has been derived, and used to evaluate the profiles at equilibrium. The model has been validated through Langmuir probe measurements in helicon processing chambers. The numerical model has then been used to study the power-coupling behavior of the discharge when the pressure of the neutral gas is decreased. When the Knudsen number of the neutral gas approaches the unity and in conditions of slightly magnetized discharge, the power deposition shifts from being edge-localized to center-localized, thus reducing the particle fluxes toward the walls and increasing the efficiency of the coupling.

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“…The beam properties, such as transverse size, beam angular spread, etc., will also be adjusted to match plasma parameters. We assume that a 5-10-m-long homogenous plasma is produced either by a laser-ionized metal vapor [18], a helicon plasma source [19], or a discharge plasma source. To witness the wakefield, we will inject a long electron beam (in future, we may also employ a compact laser plasma injector to produce high quality electrons with ultra-short bunch length), with an energy of tens of MeV (relativistic regime) before a plasma cell.…”

Section: Sps Beam For the Experimentsmentioning

confidence: 99%

A proposed demonstration of an experiment of proton-driven plasma wakefield acceleration based on CERN SPS

Xia¹,

Assmann

Fonseca³

et al. 2012

J. Plasma Phys.

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Abstract. The proton bunch-driven plasma wakefield acceleration (PWFA) has been proposed as an approach to accelerate an electron beam to the TeV energy regime in a single plasma section. An experimental program has been recently proposed to demonstrate the capability of proton-driven PWFA by using existing proton beams from the European Organization for Nuclear Research (CERN) accelerator complex. At present, a spare Super Proton Synchrotron (SPS) tunnel, having a length of 600 m, could be used for this purpose. The layout of the experiment is introduced. Particlein-cell simulation results based on realistic SPS beam parameters are presented. Simulations show that working in a self-modulation regime, the wakefield driven by an SPS beam can accelerate an externally injected ∼10 MeV electrons to ∼2 GeV in a 10-m plasma, with a plasma density of 7 × 10 14 cm −3 .

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Generalized theory of helicon waves. II. Excitation and absorption

Cited by 163 publications

References 10 publications

Nonlinear diffusion in magnetized discharges

Nonlinear diffusion in magnetized discharges

Transition from edge-localized to center-localized power deposition in helicon discharges

A proposed demonstration of an experiment of proton-driven plasma wakefield acceleration based on CERN SPS

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