Electron cyclotron emission and absorption in fusion plasmas

Bornatici, M.; Cano, R.; Barbieri, O. De; Engelmann, F.

doi:10.1088/0029-5515/23/9/005

Cited by 612 publications

(503 citation statements)

References 176 publications

(238 reference statements)

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“…To explain this observation, the EC power absorption has been investigated especially at the beginning of the plasma formation. The comparison is based on experimental data from sniffer probe (measuring the stray in the vessel) and the power absorption calculated [7] from experimental data (T e and n e , mainly), considering two passes through the resonant region. The mode conversion (from OM to XM) at reflection on the inner wall of FTU has been estimated with the GRAY code, and found to be ~80% for the used 20° injection.…”

Section: Discussionmentioning

confidence: 99%

“…In order to verify the expected major absorption and explain the observed wider extension of the emitting profile in case of oblique injection, a comparison is made between the experimental data of not absorbed power obtained from a sniffer probe 120° toroidally displaced with respect to launcher, and the absorbed power calculated by the analytical expressions for the EC optical depth [7] taking into account mode conversion at the inner wall.…”

Section: Analysis Of Ec Absorptionmentioning

confidence: 99%

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Studies on absorption of EC waves in assisted startup experiment on FTU

Granucci¹,

Ricci²,

Farina³

et al. 2012

EPJ Web of Conferences

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Abstract. Assistance of EC wave for plasma breakdown and current ramp up is the proposed scenario for the ITER case, characterized by low toroidal electric field. The experimental results on many tokamaks clearly indicate the capabilities of the proposed scheme to have a robust breakdown in ITER. The key aspect of this technique is the EC power required, strongly related to the absorption of the wave in the initial stage of plasma formation. This aspect is generally neglected due to the diagnostics difficulties in the plasma formation phase. As a consequence a multi-pass absorption scheme is usually considered reasonable, leading to a strong absorption after many reflections on the walls. The present study exploits the high temporal and spatial resolution of the fast scanning interferometer of FTU together with the measure of residual power obtained by a sniffer probe. The absorbed EC power is calculated considering also the polarization rotation and the subsequent mode conversion after incidence on the internal wall and compared with that derived from experimental data. The resulting EC power distribution can explain differences observed between perpendicular and oblique injection results, indicating future investigations to define ITER power requirements.

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Section: Discussionmentioning

confidence: 99%

Section: Analysis Of Ec Absorptionmentioning

confidence: 99%

Studies on absorption of EC waves in assisted startup experiment on FTU

Granucci¹,

Ricci²,

Farina³

et al. 2012

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…Trubnikov's tensor is used (see e.g. Shkarofsky 1966;Bornatici et al 1983;Robinson 1986;Melrose 1997a) to treat the mildly relativistic (ρ 1), small-gyroradius (k 2 ⊥ Ω 2 e ρ) limit in which r(ξ) is assumed large so that the Macdonald functions may be approximated by their asymptotic forms. The weakly magnetized limit is obtained by expanding in powers of Ω e , both in (4.1) and elsewhere in the relevant integrands.…”

Section: Discussionmentioning

confidence: 99%

Generalized Trubnikov functions for unmagnetized plasmas

Melrose

1999

J. Plasma Phys.

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Abstract.A class of relativistic dispersion functions for unmagnetized thermal plasmas is defined by generalizing functions first defined by Trubnikov in 1958. Recursion relations are derived that allow one to generate explicit expressions for the class of functions in terms of the relativistic plasma dispersion function T (z, ρ) introduced by Godfrey et al. in 1975. These functions are relevant to the description of the response of a weakly mangetized, highly relativistic, thermal plasma.

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“…For the case of a slightly relativistic plasma, asymptotic expansions can be made to simplify the expressions of the relativistic susceptibility tensor [8,9]. This approximation enables the integral to be expressed in terms of the plasma dispersion function just as in the nonrelativistic case [10, 11].…”

Section: Relativistic Susceptibility Tensormentioning

confidence: 99%

Effects of relativistic electrons on the calculated collective Thomson scattered spectra

1995

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The effects of relativistic electrons on the spectral density function, S(kw), is evaluated in the collective Thomson scattering regime for ion diagnostics. An electromagnetic code which calculates the electron density fluctuation term of S(k,W) has been modified by treating the electrons with a relativistic Maxwellian susceptibility tensor. Results are presented for calculated scattered spectra representative of the ITER plasma parameters.

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Electron cyclotron emission and absorption in fusion plasmas

Cited by 612 publications

References 176 publications

Studies on absorption of EC waves in assisted startup experiment on FTU

Studies on absorption of EC waves in assisted startup experiment on FTU

Generalized Trubnikov functions for unmagnetized plasmas

Effects of relativistic electrons on the calculated collective Thomson scattered spectra

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