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Author : N. N. Gorelenkov
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (713 download)
Download or read book Stability Properties of Toroidal Alfven Modes Driven by Fast Particles written by N. N. Gorelenkov and published by . This book was released on 1999 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : N. N. Gorelenkov
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (713 download)
Download or read book Stability Properties of Toroidal Alfven Modes Driven by Fast Particles written by N. N. Gorelenkov and published by . This book was released on 1999 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 51 pages
Book Rating : 4.:/5 (893 download)
Download or read book Nonlinear Interaction of Fast Particles with Alfven Waves in Toroidal Plasmas written by and published by . This book was released on 1996 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical algorithm to study the nonlinear, resonant interaction of fast particles with Alfven waves in tokamak geometry has been developed. The scope of the formalism is wide enough to describe the nonlinear evolution of fishbone modes, toroidicity-induced Alfven eigenmodes and ellipticity-induced Alfven eigenmodes, driven by both passing and trapped fast ions. When the instability is sufficiently weak, it is known that the wave-particle trapping nonlinearity will lead to mode saturation before wave-wave nonlinearities are appreciable. The spectrum of linear modes can thus be calculated using a magnetohydrodynamic normal-mode code, then nonlinearly evolved in time in an efficient way according to a two-time-scale Lagrangian dynamical wave model. The fast particle kinetic equation, including the effect of orbit nonlinearity arising from the mode perturbation, is simultaneously solved of the deviation, [delta]f = f - f0, from an initial analytic distribution f0. High statistical resolution allows linear growth rates, frequency shifts, resonance broadening effects, and nonlinear saturation to be calculated quickly and precisely. The results have been applied to an ITER instability scenario. Results show that weakly-damped core-localized modes alone cause negligible alpha transport in ITER-like plasmas--even with growth rates one order of magnitude higher than expected values. However, the possibility of significant transport in reactor-type plasmas due to weakly unstable global modes remains an open question.
Author : Sergei Sharapov
Publisher : CRC Press
ISBN 13 : 1351002813
Total Pages : 156 pages
Book Rating : 4.3/5 (51 download)
Download or read book Energetic Particles in Tokamak Plasmas written by Sergei Sharapov and published by CRC Press. This book was released on 2021-04-02 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of energetic particles in magnetic fusion plasmas is key to the development of next-generation "burning" plasma fusion experiments, such as the International Thermonuclear Experimental Reactor (ITER) and the Demonstration Power Station (DEMO). This book provides a comprehensive introduction and analysis of the experimental data on how fast ions behave in fusion-grade plasmas, featuring the latest ground-breaking results from world-leading machines such as the Joint European Torus (JET) and the Mega Ampere Spherical Tokamak (MAST). It also details Alfvenic instabilities, driven by energetic ions, which can cause enhanced transport of energetic ions. MHD spectroscopy of plasma via observed Alfvenic waves called "Alfvén spectroscopy" is introduced and several applications are presented. This book will be of interest to graduate students, researchers, and academics studying fusion plasma physics. Features: Provides a comprehensive overview of the field in one cohesive text, with the main physics phenomena explained qualitatively first. Authored by an authority in the field, who draws on his extensive experience of working with energetic particles in tokamak plasmas. Is suitable for extrapolating energetic particle phenomena in fusion to other plasma types, such as solar and space plasmas.
Author : Jason Sears
Publisher :
ISBN 13 :
Total Pages : 221 pages
Book Rating : 4.:/5 (681 download)
Download or read book Measurement and Interpretation of Stable and Unstable Alfvén Eigenmodes in the Presence of Fast Ions in Alcator C-Mod written by Jason Sears and published by . This book was released on 2010 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stability of two types of lightly damped resonant eigenmodes in the presence of energetic ions is studied in Alcator C-Mod. Global Alfven eigenmodes (GAEs) can exist at frequencies between the continua of adjacent poloidal mode numbers to avoid strong continuum damping. Toroidicity-induced Alfven eigenmodes (TAEs) exist in gaps in the frequency continuum induced by toroidal coupling. Passing and trapped fast ions can resonantly excite AEs, which saturate at significant amplitude and redistribute the ions. There is evidence that consequent losses of D-T alpha particles could degrade the fusion burn. Unstable TAEs driven by ICRF-heated fast ions are observed in Alcator C-Mod with toroidal mode numbers of n = -4 and n = 6. Positive mode numbers indicate that modes are driven by fast ions having hollow pressure profiles, in agreement with measurements using the Compact Neutral Particle Analyzer (CNPA). In the absence of sufficient fast ion drive, eigenmodes are detected by exciting them with antennas close to the plasma boundary and monitoring the plasma frequency response with an array of magnetic probes, a method called active MHD excitation. This thesis reports for the first time that TAEs of various toroidal mode numbers are excited with a wide-toroidal-spectrum antenna and observed using a fully resolved toroidal array of probes. GAEs with n = 0 and damping rates around y/wo = -1%, and TAEs with n = 1 and damping rates around /~wo = -1.5% are observed. Rigorous calibration is applied to the magnetic probes to reject the system response of the diagnostic. Measurements demonstrate that even with a wide-spectrum antenna, the range of AEs that are accessible to the diagnostic for any particular equilibrium remains quite limited, subject to the modes' proximity to the plasma edge. A composite spectrum of observed stable and unstable modes, and the stability spectrum calculated by NOVA-K, shows that for fast ions with approximately 150 keV effective temperature, the most unstable mode number tends to be around n = -5. In comparison, the simple scaling of fast ion drive for kopi ~~ 1 predicts unstable modes around n = -8, demonstrating reasonable agreement with the measurements. Local islands of stability that are observed in the toroidal mode number spectrum and the fast ion temperature could be exploited by the strong dependence of the AE spectrum on subtle changes in equilibrium parameters to stabilize AEs in burning plasmas.
Author :
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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (16 download)
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.
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ISBN 13 :
Total Pages : 654 pages
Book Rating : 4.:/5 (31 download)
Download or read book Nuclear Fusion written by and published by . This book was released on 2003-11 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1018 pages
Book Rating : 4.X/5 (4 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (727 download)
Download or read book Effect of Alpha Particles on Toroidal Alfven Eigenmodes written by and published by . This book was released on 1992 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview is given of the analytic structure for the linear theory of the Toroidal Alfven Eigenmode (TAE), where multiple gap structures occur. A discussion is given of the alpha particle drive and the various dissipation mechanisms that can stabilize the system. A self-consistent calculation of the TAE mode, for a low-beta high-aspect-ratio plasma, indicates that though the alpha particle drive is comparable to the dissipation mechanisms, overall stability is still achieved for ignited ITER-like plasma. A brief discussion is given of the nonlinear theory for the TAE mode and how nonlinear alpha particle dynamics can be treated by mapping methods.
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ISBN 13 :
Total Pages : 610 pages
Book Rating : 4.E/5 ( download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 610 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.
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher :
ISBN 13 :
Total Pages : 1782 pages
Book Rating : 4.:/5 (319 download)
Download or read book Energy and Water Development Appropriations for 2007 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 2006 with total page 1782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Congress. Senate. Committee on Appropriations. Subcommittee on Energy and Water, and Related Agencies
Publisher :
ISBN 13 :
Total Pages : 1800 pages
Book Rating : 4.3/5 ( download)
Download or read book Energy and Water, and Related Agencies Appropriations for Fiscal Year 2007 written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Energy and Water, and Related Agencies and published by . This book was released on 2006 with total page 1800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J.W. Connor
Publisher : American Institute of Physics
ISBN 13 :
Total Pages : 472 pages
Book Rating : 4.3/5 (91 download)
Download or read book Theory of Fusion Plasmas written by J.W. Connor and published by American Institute of Physics. This book was released on 2006-12-07 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas takes place every other year in a place particularly favourable for informal and in depth discussions. Invited and contributed papers present state-of-the-art researches in theoretical plasma physics, covering all domains relevant to fusion plasmas. This workshop always allows a fruitful mix of experienced researchers and students.
Author : United States. Congress. Senate. Committee on Appropriations
Publisher :
ISBN 13 :
Total Pages : 1800 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy and Water, and Related Agencies Appropriations for Fiscal Year ... written by United States. Congress. Senate. Committee on Appropriations and published by . This book was released on 2007 with total page 1800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 170 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fusion Energy Update written by and published by . This book was released on 1982-04 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 782 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 2018 pages
Book Rating : 4.3/5 (91 download)
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
