Applications of high-power millimeter waves in fusion energy research

Luce, T. C.

doi:10.1109/tps.2002.802147

Cited by 71 publications

(29 citation statements)

References 139 publications

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“…Note however that this efficiency loss (as opposed to mere broadening of the driven current profile) becomes significant only when w becomes comparable with the plasma radius (see also [39]), and would be considerably overestimated by replacing the plasma radius with the ECRH deposition width as the characteristic scale length, as proposed in [29]. In TCV the primary effect of radial transport is to regulate the electron distribution function and thus the ECCD efficiency at an intermediate level between the linear and quasilinear limits, as well as to broaden the current drive profile, whereas global fast electron losses do not appear to be significant.…”

Section: Quasilinear Fokker-planck Modellingmentioning

confidence: 99%

Electron cyclotron current drive and suprathermal electron dynamics in the TCV tokamak

Coda

Alberti

Blanchard³

et al. 2003

Nucl. Fusion

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Electron cyclotron current drive (ECCD) is an important prospective tool for tailoring the current profile in nextstep devices. To fill the remaining gaps between ECCD theory and experiment, especially in the efficiency and localization of current drive, a better understanding of the physics of suprathermal electrons appears necessary. In TCV, the fast electron population is diagnosed by a multichordal, spectrometric hard x-ray camera and by a highfield side electron cyclotron emission radiometer. The main modelling tool is the quasilinear Fokker-Planck code CQL3D, which is equipped with a radial particle transport model. Systematic studies of fast electron dynamics have been performed in TCV with modulated or pulsed electron cyclotron power, followed by coherent averaging, in order to identify the roles of collisional relaxation and radial transport in the dynamics of the suprathermal population. A consistent picture is emerging from experiment and modelling, pointing to the crucial role of the radial transport of suprathermal electrons in the physics of ECCD.

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Section: Quasilinear Fokker-planck Modellingmentioning

confidence: 99%

Electron cyclotron current drive and suprathermal electron dynamics in the TCV tokamak

Coda

Alberti

Blanchard³

et al. 2003

Nucl. Fusion

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“…By the time of the previous review [5], the suppression of (m=3,n=2) NTMs had been demonstrated in several tokamaks [24], [25], [26] and [27] and first experiments on partial (2,1) suppression had been carried out. Also, first attempts at feedback control of the deposition had been made.…”

Section: Application Of Ecrh and Eccd For Optimization Of Plasma Stabmentioning

confidence: 99%

“…In particular the localized heating and current drive that is possible by ECRH and ECCD has led to applications in confinement as well as in tailoring MHD stability. An earlier review of this area can be found in [5]; since then, major progress in this field has especially been in the area of the suppression of Neoclassical Tearing Modes (NTMs). The emphasis of this review is therefore on new schemes for ECRH and ECCD and on the application of classical ECCD schemes to NTM suppression.…”

Section: Introductionmentioning

confidence: 99%

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Recent Experimental Progress in Electron Cyclotron Resonance Heating and Electron Cyclotron Current Drive in Magnetically Confined Fusion Plasmas

Zohm

2007

Fusion Science and Technology

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A review of recent experimental results in the area of ECRH and ECCD is given. Special emphasis is put on the recent developments of new schemes in which EC waves can heat and drive current in magnetically confined fusion plasmas. These comprise scenarios to overcome the density cutoff experienced in application of the classical O1 and X2 scheme as well as to increase the current drive efficiency of EC waves while maintaining their good localization. In particular, we discuss recent experimental progress in tokamaks, stellarators and spherical tori in the areas of the O2, X3 and EBW schemes (mostly OXB scheme) as well as experiments in which the combination of ECCD with Lower Hybrid Current Drive (LHCD) leads to a synergetic increase of the ECCD efficiency. A particular application of ECCD that has recently received a lot of attention and is therefore reviewed in this paper is the suppression of Neoclassical Tearing Modes (NTMs) by ECCD. We show that the theoretically predicted requirements for ECCD in terms of deposition (maximising the ECCD driven current density) and injection in phase with the O-point of the magnetic island associated with the NTM (which is needed when the island width falls below the deposition width) have been verified experimentally. Also, many of the elements needed for constructing a reliable, feedback controlled NTM suppression system for ITER based on ECCD have now been demonstrated experimentally and the next step, which is their integration into a reliable scheme, is well within reach.

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“…The cyclotron resonance maser (CRM) instability, a beam-wave coupling mechanism, drives a convective instability within the gyro-TWA interaction circuit resulting in growth of an input EM wave. The instantaneous bandwidth of a gyro-TWA lends the vacuum device to applications including radar systems [1], communications [2] and plasma heating [3].…”

Section: Introductionmentioning

confidence: 99%

TE10R–TE11c input coupler for a low-THz gyro-TWA

Garner

Zhang

Donaldson

et al. 2015

2015 8th UK, Europe, China Millimeter Waves and THz Technology Workshop (UCMMT)

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Abstract-The design of a fundamental rectangular-tocircular coaxial cavity input coupler for a low-THz gyrotraveling wave amplifier (TWA) is presented. Theoretical and numerical approaches to the design of the coaxial cavity input coupler are introduced. The design is optimized for operation between 360 -384 GHz, achieving a transmission bandwidth of 7.5% (358 -386 GHz). A comment on the manufacturability of sub-mm waveguide channels is included.

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Applications of high-power millimeter waves in fusion energy research

Cited by 71 publications

References 139 publications

Electron cyclotron current drive and suprathermal electron dynamics in the TCV tokamak

Electron cyclotron current drive and suprathermal electron dynamics in the TCV tokamak

Recent Experimental Progress in Electron Cyclotron Resonance Heating and Electron Cyclotron Current Drive in Magnetically Confined Fusion Plasmas

TE10R–TE11c input coupler for a low-THz gyro-TWA

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