Upper-Hybrid-Resonance Absorption of Laser Radiation in a Magnetized Plasma

Grebogi, Celso; Liu, C.S.; Tripathi, V. K.

doi:10.1103/physrevlett.39.338

Cited by 49 publications

(16 citation statements)

References 9 publications

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“…An analytic, warm-plasma theory with a linear profile (Grebogi, Liu & Tripathi 1977) predicted a 70% absorption for normal incidence. An analytic and numerical study for oblique incidence in a magnetized plasma showed that there is an optimum combination of 6 and B o and predicted that it is possible to obtain 99% absorption (Woo, Estabrook & DeGroot 1978).…”

Section: Resonant Absorptionmentioning

confidence: 99%

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Stamper

1991

Laser Part. Beams

180

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Large (megagauss) "spontaneous" magnetic fields are produced by laser-plasma interactions when a short, powerful laser pulse is focused to a small diameter onto a solid target. The relevance of these magnetic fields to inertial confinement fusion applications depends on the numerous ways in which they can affect laser-plasma interactions and the resulting plasma. Theoretical studies have dealt with a variety (thermal, radiative, and dynamo) of generation mechanisms and with the associated transport and instability phenomena. The fields, originally observed with small induction probes placed near the target, have been studied in the focal region by optical methods. These optical diagnostics have used Faraday rotation of a probing laser beam and Zeeman profiles of emitted spectral lines.

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Section: Resonant Absorptionmentioning

confidence: 99%

Review on spontaneous magnetic fields in laser-produced plasmas: Phenomena and measurements

Stamper

1991

Laser Part. Beams

180

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“…Additionally, a mode conversion layer surrounds a plasma where the EBW can transform into an X-or O-mode polarized electromagnetic wave. Coupling of this sort has been invoked to explain emission from astrophysical plasmas [1-5] and absorption in laser produced plasmas [6,7].In magnetic fusion, the interest in EBW mode conversion is twofold. First, a thermally excited EBW can be measured via mode conversion in order to measure the electron temperature (T e ) of an overdense plasma (f pe f ce ) for which standard electron cyclotron emission (ECE) techniques [8] are not applicable.…”

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confidence: 99%

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confidence: 99%

Controlled Optimization of Mode Conversion from Electron Bernstein Waves to Extraordinary Mode in Magnetized Plasma

et al. 2003

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In the CDX-U spherical torus, agreement between radiation temperature and Thomson scattering electron temperature profiles indicates approximately 100% conversion of thermally emitted electron Bernstein waves to the X mode. This has been achieved by controlling the electron density scale length (L(n)) in the conversion region with a local limiter outside the last closed flux surface, shortening L(n) to the theoretically required value for optimal conversion. From symmetry of the conversion process, prospects for efficient coupling in heating and current drive scenarios are strongly supported.

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“…The energy of incident transverse wave is converted into an induced longitudinal one via mode conversion processes, in which the coupling of the longitudinal component of the electric field into the density gradient leads to the generation of a propagating plasma wave [4]. The later gives its energy to the electrons via many mechanisms such that Landau damping and electron trapping [5,6]. Because the excited Langmuir waves can have phase velocities of the order of the velocity of light, they can lead to the production of electrons of very high energy.…”

Section: Introductionmentioning

confidence: 99%