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Destabilization Of Low Mode Number Alfven Modes In A Tokamak By Energetic Or Alpha Particles
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Book Synopsis Destabilization of Low Mode Number Alfven Modes in a Tokamak by Energetic Or Alpha Particles by :
Download or read book Destabilization of Low Mode Number Alfven Modes in a Tokamak by Energetic Or Alpha Particles written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the inclusion of finite Larmor radius effects in the shear Alfven eigenmode equation, the continuous Alfven spectrum, which has been extensively discussed in ideal magnetohydrodynamics, is removed. Neutrally stable, discrete radial eigenmodes appear in the absence of sources of free energy and dissipation. Alpha (or energetic) particle toroidal drifts destabilize these modes, provided the particles are faster than the Alfven speed. Although the electron Landu resonance contributes to damping, a stability study of the parametric variation of the energy and the density scale length of the energetic particles shows that modes with low radial mode numbers remain unstable in most cases. Since the alpha particles are concentrated in the center of the plasma, this drift-type instability suggests anomalous helium ash diffusion. Indeed, it is shown that stochasticity of alpha orbits due to the overlapping of radially neighboring Alfven resonances is induced at low amplitudes, e/sub i//sup approx./phi/T/sub i/ greater than or equal to 0.05, implying a diffusion coefficient D/sub r//sup .cap alpha./ greater than or equal to 4.4 x 103cm2/s.
Book Synopsis Alpha Particle Destabilization of the Toroidicity-induced Alfven Eigenmodes by :
Download or read book Alpha Particle Destabilization of the Toroidicity-induced Alfven Eigenmodes written by and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high frequency, low mode number toroidicity-induced Alfven eigenmodes (TAE) are shown to be driven unstable by the circulating and/or trapped?-particles through the wave-particle resonances. Satisfying the resonance condition requires that the?-particle birth speed v{sub?} ≥ v{sub A}/2{vert bar}m-nq{vert bar}, where v{sub A} is the Alfven speed, m is the poloidal model number, and n is the toroidal mode number. To destabilize the TAE modes, the inverse Landau damping associated with the?-particle pressure gradient free energy must overcome the velocity space Landau damping due to both the?-particles and the core electrons and ions. The growth rate was studied analytically with a perturbative formula derived from the quadratic dispersion relation, and numerically with the aid of the NOVA-K code. Stability criteria in terms of the?-particle beta?{sub?},?-particle pressure gradient parameter (?{sub {asterisk}}/?{sub A}) (?{sub {asterisk}} is the?-particle diamagnetic drift frequency), and (v{sub {alpha}}/v{sub A}) parameters will be presented for TFTR, CIT, and ITER tokamaks. The volume averaged {alpha}-particle beta threshold for TAE instability also depends sensitively on the core electron and ion temperature. Typically the volume averaged {alpha}-particle beta threshold is in the order of 10−4. Typical growth rates of the n=1 TAE mode can be in the order of 10−2?{sub A}, where?{sub A}=v{sub A}/qR. Other types of global Alfven waves are stable in D-T tokamaks due to toroidal coupling effects.
Book Synopsis On Resonant Destabilization of Toroidal Alfven Eigenmodes by Circulating and Trapped Energetic Ions/alpha Particles in Tokamaks by :
Download or read book On Resonant Destabilization of Toroidal Alfven Eigenmodes by Circulating and Trapped Energetic Ions/alpha Particles in Tokamaks written by and published by . This book was released on 1991 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Toroidal Alfven eigenmodes are shown to be resonantly destabilized by both circulating and trapped energetic ions/alpha particles. In particular, the energetic circulating ions are shown to resonate with the mode not only at the Alfven speed ([upsilon]{sub A}), but also one-third of this speed, while resonances exist between trapped energetic ions and the wave when [upsilon] = [upsilon]{sub A}/21[epsilon]{sup {1/2}} (l=integer, [epsilon]=r/R is the local inverse aspect ratio), although the instability becomes weaker for resonances other than the fundamental. The oft-quoted criterion that instability requires super-Alfvenic ion velocities is thus sufficient but not necessary. 14 refs.
Book Synopsis On Resonant Destabilization of Toroidal Alfven Eigenmodes by Circulating and Trapped Energetic Ions/alpha Particles in Tokamaks by : Hamid Biglari
Download or read book On Resonant Destabilization of Toroidal Alfven Eigenmodes by Circulating and Trapped Energetic Ions/alpha Particles in Tokamaks written by Hamid Biglari and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1986 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Book Synopsis ON RESONANT DESTABILIZATION OF TOROIDAL ALFVEN EIGENMODES BY CIRCULATINGAND TRAPPED ENERGETIC IONS/ALPHA PARTICLES IN TOKAMAKS. by : H. Biglari
Download or read book ON RESONANT DESTABILIZATION OF TOROIDAL ALFVEN EIGENMODES BY CIRCULATINGAND TRAPPED ENERGETIC IONS/ALPHA PARTICLES IN TOKAMAKS. written by H. Biglari and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Destabilization of Tokamak Pressure-gradient Driven Instabilities by Energetic Alpha Populations by :
Download or read book Destabilization of Tokamak Pressure-gradient Driven Instabilities by Energetic Alpha Populations written by and published by . This book was released on 1989 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alpha particle populations can significantly alter existing MHD in stabilities in tokamaks through kinetic effects and coupling to otherwise stable shear Alfven waves. Here we consider resonances of the trapped alpha precessional drift with both the usual ballooning mode diamagnetic frequency ([omega]{sub *i}/2) and the toroidicity induced Alfven eigenmode (TAE). This is examined for noncircular tokamaks in the high-n ballooning limit using an isotropic alpha slowing down distribution and retaining the full energy and pitch angle dispersion in the alpha drift frequency. Applying this to CIT and ITER indicates that ballooning instabilities can persist at [Beta]'s below the ideal MHD threshold. These are especially dominated by the destabilization of the TAE mode. In addition, a hybrid fluid-particle approach for simulating alpha effects on pressure-gradient driven instabilities is described. 13 refs., 6 figs.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book INIS Atomindex written by and published by . This book was released on 1987 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Transport In Magnetized Plasmas (Second Edition) by : C Wendell Horton, Jr
Download or read book Turbulent Transport In Magnetized Plasmas (Second Edition) written by C Wendell Horton, Jr and published by #N/A. This book was released on 2017-07-21 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: For a few seconds with large machines, scientists and engineers have now created the fusion power of the stars in the laboratory and at the same time find the rich range of complex turbulent electromagnetic waves that transport the plasma confinement systems. The turbulent transport mechanisms created in the laboratory are explained in detail in the second edition of 'Turbulent Transport in Magnetized Plasmas' by Professor Horton.The principles and properties of the major plasma confinement machines are explored with basic physics to the extent currently understood. For the observational laws that are not understood — the empirical confinement laws — offering challenges to the next generation of plasma students and researchers — are explained in detail. An example, is the confinement regime — called the 'I-mode' — currently a hot topic — is explored.Numerous important problems and puzzles for the next generation of plasma scientists are explained. There is growing demand for new simulation codes utilizing the massively parallel computers with MPI and GPU methods. When the 20 billion dollar ITER machine is tested in the 2020ies, new theories and faster/smarter computer simulations running in near real-time control systems will be used to control the burning hydrogen plasmas.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energetic Particle Effects Can Explain the Low Frequency of Alfvn Modes in the DIII-D Tokamak by : N. N. Gorelenkov
Download or read book Energetic Particle Effects Can Explain the Low Frequency of Alfvn Modes in the DIII-D Tokamak written by N. N. Gorelenkov and published by . This book was released on 2001 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics by :
Download or read book Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics written by and published by . This book was released on 1981 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Excitation of High-n Toroidicity-induced Shear Alfven Eigenmodes by Energetic Particles and Fusion Alpha Particles in Tokamaks by : C. Z. Cheng
Download or read book Excitation of High-n Toroidicity-induced Shear Alfven Eigenmodes by Energetic Particles and Fusion Alpha Particles in Tokamaks written by C. Z. Cheng and published by . This book was released on 1992 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Technology written by and published by . This book was released on 1994 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Nucléaire written by and published by . This book was released on 2006 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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