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Friday, April 24, 2020 | History

2 edition of Alfven resonance heating via magnetosonic modes in large tokamaks found in the catalog.

Alfven resonance heating via magnetosonic modes in large tokamaks

C. F. F. Karney

Alfven resonance heating via magnetosonic modes in large tokamaks

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  • 36 Currently reading

Published by Dept. of Energy, Plasma Physics Laboratory, for sale by the National Technical Information Service] in Princeton, N.J, [Springfield, Va .
Written in English

    Subjects:
  • Tokamaks

  • Edition Notes

    StatementCharles F. F. Karney and Francis W. Perkins, Plasma Physics Laboratory, Princeton University
    SeriesPPPL ; 1471
    ContributionsPerkins, Francis W., joint author, United States. Dept. of Energy, Princeton University. Plasma Physics Laboratory
    The Physical Object
    Pagination9 p. ;
    ID Numbers
    Open LibraryOL14882465M

    Providing a historical overview of 50 years of fusion research, a review of the fundamentals and concepts of fusion and research efforts towards the implementation of a steady state tokamak reactor is presented. In , a steady-state tokamak reactor (SSTR) best utilizing the bootstrap current was developed. Since then, significant efforts have been made in major tokamaks, Cited by: 7. In Part I, a reduced set of MHD equations is derived, applicable to large aspect ratio tokamaks and relevant for dynamics sub-Alfv\'enic with respect to ideal ballooning modes. Our ordering optimally allows sound waves, Mercier modes, drift modes, geodesic-acoustic modes, zonal flows, and shear Alfv\'en : Wrick Sengupta. The rotational transform (or field line pitch) ι/2π is defined as the number of poloidal transits per single toroidal transit of a field line on a toroidal flux surface. The definition can be relaxed somewhat to include field lines moving in a spatial volume between two nested toroidal surfaces (e.g., a stochastic field region). induced via other coils. Ignition is the state of the reactor when the heating from the fusion reactions is enough to maintain the temperature without auxiliary heating. The Lawson criteria is a simple criteria for estimating the conditions for ignition in a fusion reactor. The criterion is a product of the number density n, energy confinement.


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Alfven resonance heating via magnetosonic modes in large tokamaks by C. F. F. Karney Download PDF EPUB FB2

Get this from a library. Alfven resonance heating via magnetosonic modes in large tokamaks. [C F F Karney; Francis W Perkins; United States. Department of Energy.; Princeton University. Plasma Physics Laboratory.]. The book by N F Cramer represents a good effort to facilitate this cross-fertilisation in the subject of Alfvén waves.

Alfvén Resonance Effects on Magnetosonic Modes in Large Alfven resonance heating via magnetosonic modes in large tokamaks book. Alfvén Modes in Tokamaks and ITER James W.

Van Dam US Burning Plasma Organization & Institute for Fusion Studies The University of Texas at Austin CMPD-CMSO Winter School Janu Shear Alfvén waves in LAPD (Van Zeeland et al., PRL ).

Abstract. Experimental studies on heating of toroidal plasmas in universities in Japan are summarized. In Japan major fusion activities in universities are oriented to the development of so-called alternative concepts, that could remove some of the difficulties such as pulse operation, complicated structure, and low plasma beta, that tokamaks must overcome to develop into.

A tokamak (Russian: Токамáк) is a device which uses a powerful magnetic field to confine a hot plasma in the shape of a tokamak is one of several types of magnetic confinement devices being developed to produce controlled thermonuclear fusion ofit is the leading candidate for a practical fusion reactor.

Tokamaks were initially conceptualized in the. Heating of a collisionless plasma by utilizing the spatial resonance of shear Alfven waves is proposed ahd application to toroidal plasmas is discussed. The resonance ~xists due to the nonuniform Alfven speed.

This heating scheme is analyzed inonedimerisidn including the effects of a shear magnetic field and plasma compressibility. For plasmas. Heating of ions by two Alfven waves propagating along an external magnetic field via nonresonant wave-particle interaction in low-{beta} plasmas is studied using test-particle simulation.

Resonance and synergy effects on fast ion transport in tokamaks: A symplectic approach by Majid Khan (Author), Klaus Schoepf (Author), Victor Goloborod'ko (Author) & ISBN ISBN Why is ISBN important.

ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book. Price: $ Heating experiments are made in Heliotron D device with use of the shear Alfven wave.

It is found that the plasma electrons in the central region of the plasma column is effectively heated in the high electron temperature case, and the electrons near the spatial resonance of the shear Alfven wave is heated in the low temperature case.

alpha particles) or auxiliary heating process (ICRH or NBI). • Fast particles can resonate with Alfvénic modes and excite instabilities that may result in significant energetic particle transport. • The existence of Toroidal Alfven Eigenmodes(TAEs) driven by fast ions in burning plasmas has been convincingly confirmed in experiment.

The kinetic theory of low-frequency Alfvén modes in tokamaks is presented. The inclusion of both diamagnetic effects and finite core-plasma ion compressibility generalizes previous theoretical analyses (Tsai S T and Chen L Phys.

Fluids B 5 ) of kinetic ballooning modes and clarifies their strong connection to beta-induced Alfvén eigenmodes. Uragan-2M is a medium-size torsatron with reduced helical ripples.

This machine has the major plasma radius R = m, the average minor plasma radius r p ≤ m and the toroidal magnetic field B 0 ≤ T. The Alfvén resonance heating in a high k ‖ regime is advantageous for small size machines since it can be realized at smaller plasma densities Cited by: 3.

Electron Bernstein Wave Heating of Overdense H-mode Plasmas in the TCV Tokamak via O-X-B Double Mode Conversion A. Pochelon 1, A. Mueck 1, Y. Camenen 1, S. Coda 1, L. Curchod 1, B.P. Duval 1, T.P. Goodman 1. Cyclotron resonance heating of a plasma in a magnetic "mirror" Paperback – January 1, by.

Unknown (Author) See all formats and editions Hide other formats and editions. Price New from Used from Paperback, January 1, Author. Unknown. The temperatures inside the ITER Tokamak must reach million degrees Celsius—or ten times the temperature at the core of the Sun—in order for the gas in the vacuum chamber to reach the plasma state and for the fusion reaction to occur.

The hot plasma must then be sustained at these extreme temperatures in a controlled way in order to extract energy.

The theoretical analysis of the AW plasma heating and current drive in tokamaks has been carried out mainly in the cylindrical approximation [4, 5, 6], which is justified in the case of tokamaks with large aspect ratio R/a(here R and a of the resonance zone for the AW modes with toroidal mode num-ber N =1.

Brazilian Journal of Physics. Fast-wave ion-cyclotron and first-harmonic heating of large tokamaks J.E. Scharer et al Nuclear Fusion 17 IOPscience. Fast-wave heating of a two-component plasma T.H. Stix Nuclear Fusion 15 IOPscience. Magneto-viscous effects on the ideal and resistive gravitational instabilities in Cartesian geometryCited by: resonance condition in (8).

In this case, the analytical form for 2 will include another integer coming from the Fourier series expansion, which relates to via = −.

(9) Moreover, the physically relevant values of can be found to be =±1, so these are the ones to be used in predictions. III. ITER’s 𝟏𝟓 𝑴𝑨 baseline scenario. which are bulk heated by electron cyclotron resonance 6 heating (ECRH).

Four heating modes have been considered: ordinary wave heating at the electron cyclotron frequency, 0, and at the second harmonic frequency, 20, and dxtraordinary wave heating at Q and at 2Q.

For ordinary wave heating at S1, which appears to be the most promising method. Basic physics of Alfvén instabilities driven by energetic particles pressure is very large, energetic particle modes that adopt the frequency of the energetic particle population occur.

Alfvén instabilities of all three types occur in every toroidal magnetic confinement in tokamaks, over 50% of the beam power was lost and beam.

This book provides a concise introduction to the basic physics of radiofrequency heating. Most existing literature on the subject is at the research level, aimed at specialists in the field. It provides a survey of theoretical and experimental results with a large number of references to help the reader wishing for more detail.

that can provide dominant bulk ion heating. The other heating methods, the electron cyclotron waves and neutral beam injectionof MeV-energy-range ions, will provide mainly electronheating. Bulk ion heating with ICRF waves is achieved throughthe absorption of the wave power by resonant ions which collisionally transfer their energy to the fuel by: 2.

iii AbdulHannan ModellingIonCyclotronResonanceHeatingandFastWaveCurrentDriveinToka-maks (inEnglish) AlfvénLaboratory,SchoolofElectricalEngineering.

Electron Cyclotron Resonance plasma heating (ECH) and current drive (CD) in Fusion plasma research in tokamaks and stellarators plays a key role in investigation of basic wave - plasma interaction physics like electrons heating, local transport coefficients behaviour, CD and current profile tailoring, Internal Transport Barrier (ITB) creation.

The spectrum of ion cyclotron emission (ICE) observed in tokamak experiments shows narrow peaks at multiples of the edge cyclotron frequency of background ions.

A possible mechanism of ICE based on the fast Alfvén Cyclotron Instability (ACI) resonantly excited by high energy charged products (α‐particles or protons) is presented here. Two‐dimensional eigenmode analysis of Cited by: possibility of heating by dissipation of Alfven waves, based on resonance of cold plasma waves, the shear Alfven wave (SW) and the compressional Alfven wave (FW).

Once the (FW) power is coupled to (SW), it stays on the magnetic surface and dissipates there, which is cause the heating of bulk : Naima Ghoutia Sabri, Tayeb Benouaz. The theoretical analysis of the AW plasma heating and current drive in tokamaks has been carried out mainly in the cylindrical approximation [4, 5, 6], which is justified in the case of tokamaks with large aspect ratio R=a (here R and a are the major and minor radius of the plasma column corres-pondingly).

Nevertheless, some features of the AW. electron density at the resonance location (nel3 from vertical chord at R~ m) indicating a possible optimum pressure for that level of ECRH power.

The maximum plasma density reached ~ 10 18 m-3 in the resonance region to be compared to ~ 10 18 m-3, the estimated average D atom density in the vessel before the ECRH application. A Steady-State L-Mode Tokamak Fusion Reactor R Figure 1: An elliptical torus model for a tokamak.

R is the major radius, a the minor radius, and rK the elongation. The influence of thermal plasma profiles on low-frequency Alfvén eigenmode dynamics in a tokamak. The confinement of fast particles, present in a tokamak plasma as nuclear fusion products and through external heating, will be essential for any future fusion reactor.

Fast particles can be expelled from the plasma through their interaction. The modes of our particular interest are the Alfvén Cascades and the Toroidicity Alfven Eigenmodes (TAE), which we describe using Magnetohydrodynamic(MHD) analysis and the AEGIS codes.

We investigate the stabilizing effect for the Alfvenic waves from continuum damping, especially near the TAE : Meng Li. Mode conversion of the fast Alfvén wave (FAW) at the ion‐hybrid frequency in the ion cyclotron range of frequencies (ICRF) is studied in the presence of ion cyclotron absorption and direct electron damping in a tokamak plasma.

The usual Budden model is extended to include the effect of electron damping and of the high‐field‐side cutoff, and is solved analytically and by: Abstract: The electron Bernstein wave (EBW) is typically the only wave in the electron cyclotron (EC) range that can be applied in spherical tokamaks for heating and current drive (H&CD).

Spherical tokamaks (STs) operate generally in high-beta regimes, in which the usual EC O- and X- modes are cut-off. In this case, EBWs seem to be the only option that can provide features Cited by: A simple model of the resistive wall mode in tokamaks Richard Fitzpatricka) Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas ~Received 13 February ; accepted 19 March.

A simple set of evolution equations is derived for the resistive wall mode in a large aspect-ratio. You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read.

Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. In large tokamaks with powerful supplementary heating, transition to H-mode occurs when the heating power exceeds a threshold.

In STOR-1M and STOR-M tokamaks, a unique heating method, turbulent heating, developed earlier in the Laboratory for non-tokamak toroidal devices, has been applied. Heating with ICRF waves is a well-established method on present-day tokamaks and one of the heating systems foreseen for ITER.

However, further work is still needed to test and optimize its performance in fusion devices with metallic high-Z plasma facing components (PFCs) in preparation of ITER and DEMO operation.

This is of particular importance for the bulk ion Cited by: 2. tokamak. Later experimental work included the large tokamak experiments in T [6] and DIII-D [7]. The Modeling efforts of Fidone and Granata [8] showed that for a large tokamak, energy deposition would not occur at the Electron Cyclotron Resonance Heating (ECRH) layer.

Maroli and Petrillo [9] added plasma radial growth and impurities. instabilities and energetic particles in tokamaks One of the main heating mechanisms for tokamaks plasmas is the injection of beams of energetic particles (EPs), whose task is the thermalization and transfer of energy to the bulk plasma.

EPs can stay in resonance and effectively exchange energy with the wave [1, 2]. Tokamak start-up with electron-cyclotron heating use of a modest amoun ot f electron cyclotron resonance heating extrapolates favourably to larger tokamaks A. 50% reduction in the start-up volt-second requiremen and impuritt y reflu ixs also observed.

Dedicated studies performed for toroidal Alfvén eigenmodes (TAEs) in ASDEX-Upgrade (AUG) discharges with monotonic q-profiles have shown that electron cyclotron resonance heating (ECRH) can make TAEs more unstable.

In these AUG discharges, energetic ions driving TAEs were obtained by ion cyclotron resonance heating (ICRH). It was found that Cited by: 6.Heating Resonant drive (a) Alfven acoustic channel for bulk ion heating via BACM (b) MHD continua and E×B spectrum for β 0 = %, n = 3 Minor radius r / a FIG.

1: Beta-induced Alfv´en continuum modes (BACM) were proposed to provide a new energy channel between fast ions (such as MeV alpha particles) and bulk ions via MHD.Second harmonic ion cyclotron resonance heating by the fast magnetosonic wave on the PLT tokamak: J.C.

Hosea Name Title Advisor(s) Schultz, Carl Goran. Tearing modes in tokamak plasmas with and without ion beam driver currents: P. K. Kaw: Wurden, Glen A. CO2 laser scattering on rf waves in ACT-I: M. Ono, K.-L. Wong: MacKay, Robert S.