VII. Electron Cyclotron Heating

Porkoláb, M.; Bonoli, P.; Englade, R.; Kritz, A.H.; Prater, R.; Smith, Gary R.

doi:10.13182/fst92-a29897

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…1) by high-power electromagnetic waves as one of the promising methods of heating and controlling fusion plasmas. [1][2][3] ECH is used to maintain a stable plasma in a large helical device (LHD). To efficiently transmit electromagnetic waves from a gyrotron, low-loss high-power millimeter wave components have been studied both theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Finite-Difference Time-Domain Simulation on Transmission of Millimeter Waves through Miter Bends

Kashima¹,

Nakamura²,

Takayama³

et al. 2013

Jpn. J. Appl. Phys.

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We have simulated the distribution of electromagnetic (EM) waves through a system composed of miter bends by finite-difference time-domain (FDTD) simulation. To study the effect of mode conversion by miter bends, three shapes of miter bends have been simulated. For the miter bend that has processed grooves inside, the profile of the output EM waves is changed slightly from that of the input wave (HE11 mode). As a result, this case exhibits the best shape of the miter bend in our simulation. In the miter bend without processed grooves inside, the output EM waves change more than in the case of the miter bend with grooves, because mode conversion occurs at the surface in miter bends without grooves. In the simple bend, which changes the direction of EM waves gradually, the profile of the output EM waves is deformed and the input profile is not conserved. Comparing the above three cases, we found that the grooves lead to more efficient to conservation of the profile of EM waves.

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Section: Introductionmentioning

confidence: 99%

Finite-Difference Time-Domain Simulation on Transmission of Millimeter Waves through Miter Bends

Kashima¹,

Nakamura²,

Takayama³

et al. 2013

Jpn. J. Appl. Phys.

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Scattering of ordinary-mode electromagnetic waves by density fluctuations in tokamaks

Smith

Cook

Kaufman

et al. 1993

Physics of Fluids B: Plasma Physics

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Discussion and applications are presented for two approaches for estimating the effects of scattering of electromagnetic waves by turbulent density fluctuations in tokamaks. Ordinary-mode waves propagating nearly perpendicular to the equilibrium magnetic field are considered. The multiple-scattering approach provides analytic results for the angular and spatial spreading of a microwave beam by the turbulence. The single-scattering approach yields numerical results and is derived by a compact technique involving Wigner functions. Both approaches are applied to idealized tokamaks to clarify relationships between the approaches and to test limits of applicability of the multiple-scattering approach.

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VII. Electron Cyclotron Heating

Cited by 2 publications

References 4 publications

Finite-Difference Time-Domain Simulation on Transmission of Millimeter Waves through Miter Bends

Finite-Difference Time-Domain Simulation on Transmission of Millimeter Waves through Miter Bends

Scattering of ordinary-mode electromagnetic waves by density fluctuations in tokamaks

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