Excitation, Propagation, and Damping of Electron Bernstein Waves in Tokamaks PDF Download
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Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
![Excitation of Large-[kappa]{sub {theta}} Ion-Bernstein Waves in Tokamaks PDF](https://books.google.com/books/content/images/frontcover/mAqAAQAACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages : 13
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The mode-converted ion-Bernstein wave excited in tokamaks is shown to exhibit certain very interesting behavior, including the attainment of very small poloidal phase velocities, the reversal of poloidal direction, and up-down asymmetries in propagation and damping. Because of these effects, this wave holds promise for channeling [alpha]-particle power to ions, something that would make a tokamak fusion reactor far more attractive than presently envisioned.
![Computational Study on Excitation, Propagation, and 3[omega]0-heating Due to the Ion Bernstein Wave PDF](https://books.google.com/books/content/images/frontcover/MiFRAAAAMAAJ?fife=w80-h100)
Author:
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Category : Ion acoustic waves
Languages : en
Pages : 68
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Author: Gerardo Giruzzi
Publisher: World Scientific
ISBN: 9812705082
Category : Science
Languages : en
Pages : 613
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The 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-12) was held in Aix-en-Provence (France) from May 13 to 16, 2002. This workshop was concerned with the interaction of electromagnetic waves and hot plasmas, a subject of great importance in the framework of research on controlled thermonuclear fusion. Using as a fuel a mixture of deuterium and tritium, which can be extracted from sea water, this is a very promising way to develop an intrinsically safe reactor. The workshop gathered approximately one hundred specialists in the production, use and theory of millimetre waves for heating and diagnostics of fusion plasmas.
Author: N. J. Fisch
Publisher:
ISBN:
Category : Alpha rays
Languages : en
Pages : 12
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Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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In the electron cyclotron range of frequencies, the high-beta NSTX plasmas are overdense to the traditional extraordinary X mode and/or the ordinary O mode. For low harmonics of the electron cyclotron frequency, the X and O modes are cutoff at the edge and for high harmonics the plasma is essentially optically thin to these modes. Thus, heating of such plasmas by electron cyclotron waves or diagnosing of such plasmas by electron cyclotron wave emission becomes problematic. However, such plasmas are optically thick to electron Bernstein waves (EBW) which are strongly absorbed or emitted by thermal electrons in the Doppler shifted vicinity of the fundamental or harmonics of the electron cyclotron resonance [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. In order to propagate out into the vacuum region, EBWs have to mode convert to the X and O modes at the upper hybrid resonance. In this paper we discuss the approximate kinetic model that has been developed to study this mode conversion process. From this model we show that the emission coefficients for the X and O modes from EBWs are directly related to the excitation coefficients of EBWs from X and O modes.
Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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The high-beta operating regime of spherical tori (ST), such as in the National Spherical Torus Experiment (NSTX) and the Mega Amp Spherical Tokamak (MAST), makes them attractive fusion devices. For access to such high beta regimes it is necessary to heat and to drive currents in ST plasmas. In the electron cyclotron range of frequencies such plasmas are overdense to conventional electron cyclotron waves. However, in this frequency range, electron Bernstein waves (EBW) offer an attractive alternative as they have no density cutoffs. Electron Bernstein waves can be excited in an ST plasma by mode conversion of the extraordinary or the ordinary mode at the upper hybrid resonance. The applications of EBWs in STs range from plasma start-up and heating of the plasma to modifying and controlling its current profile. The controlling of the current profile could provide better confinement as well as help suppress neoclassical tearing modes. The mode conversion to EBWs has been detailed in a variety of papers. This paper deals with two particular topics that further quantify the role of EBWs in spherical tori. interests. The first topic is on the relevance of relativistic effects in describing the propagation and damping of EBWs. The second topic is on plasma current generation by EBWs.
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Category : Nuclear energy
Languages : en
Pages : 938
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Author:
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ISBN:
Category : Controlled fusion
Languages : en
Pages : 170
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Author: Abraham Bers
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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