Adiabatic Compression of the Tokamak Discharge

Bol, K.; Ellis, R.; Eubank, H. P.; Furth, H. P.; Jacobsen, R. A.; Johnson, L. C.; Mazzucato, E.; Stodiek, W.; Tolnas, E.

doi:10.1103/physrevlett.29.1495

Cited by 75 publications

(66 citation statements)

References 8 publications

(2 reference statements)

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“…It is interesting that when mode-locking occurs, it apparently takes place throughout the plasma within a fraction of a cycle, according to the signals obtained from the pickug.coils _and from x-ray detectors monit2ring emission from the plasma core. 2 Presumably, then, the effect propagates thrriugh the plasma on the hydromagnet~c time scale; skin penetration times would be orders of magnitude longer. The implication of this result would seem to be that the saturated m = 2 oscillations do indeed result from a rotating quasistable helical equilibrium,2 1 and that the shear free rotation around the minor axis is due to an appropriately varying radial electric field which compensates for the variation of the electron diamagnetic drift frequency with radius.…”

Section: Experiments With the M = 2 Modementioning

confidence: 99%

Experiments on the Adiabatic Toroidal Compressor

Bol¹,

Cecchi²,

Daughney³

et al. 1974

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Section: Experiments With the M = 2 Modementioning

confidence: 99%

Experiments on the Adiabatic Toroidal Compressor

Bol¹,

Cecchi²,

Daughney³

et al. 1974

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“…Gne successful method of heating tokamak plasmas has been compression in major radius (Bol, et al , 1972 where P= -P, +p, =(n, +n;)T. Equation (7.48) states that the poloidal flux is conserved, following a surface of constant toroidal flux. By differentiating with respect to Q and using the definition of the safety factor q, Eq, (2.50), we have q =const.…”

Section: F Adiabatic Compressionmentioning

confidence: 99%

Theory of plasma transport in toroidal confinement systems

1976

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The dissipation induced by coulomb-collisional scattering provides an irreducible minimum, and thus a useful standard for comparison, for transport processes in a hot, magnetically confined plasma. The kinetic description of this dissipation is provided by an equation of the Fokker -Planck form. As in the standard transport theory for a neutral gas, approximate solution of the Fokker -Planck equation permits the calculation of transport coefficients, which linearly relate the fluxes of particles, energy, and electric charge, to the density and temperature gradients, and to the electric field. The transport relations are useful in studying the confinement properties of present and future experimental devices for research in controlled thermonuclear fusion. The transport theory for a magnetized plasma (in which the Larmor radius is much smaller than gradient scale lengths describing the plasma fluid) departs from the theory for a neutral gas in several fundamental ways. Thus, transport coefficients for a magnetized plasma can be calculated even when the collisional mean free path is much longer than the gradient scale length (as would pertain in thermonuclear regimes). Such transport coefficients are generally nonlocal, being defined in terms of averages over surfaces with macroscopic dimensions. Furthermore, when the mean free path is long, the magnetized-plasma transport coefficients depend crucially upon the magnetic field geometry, the effects of which must be treated at the kinetic level of the Fokker -Planck equation. The results display several novel couplings between collisional dissipation and the electromagnetic field. The present review of magnetizedplasma transport theory is intended to be as widely accessible as possible. Thus the relevant features of magnetic confinement in closed (toroidal) systems, and of charged particles in spatially varying fields, are derived, at least in outline, from first principles. Although consideration is given to "classical" transport in which most field geometric effects are omitted, major emphasis is placed on the "neoclassical" theory which has been developed over the last decade, Neoclassical transport coefficients are specifically relevant to a magnetically confined plasma, rather than to just a magnetized plasma; their unusual features, such as nonlocality and geometry dependence, become particularly important in the high temperature regime of proposed thermonuclear reactors, The area of neoclassical theory which seems most complete -its application to axisymmetric tokamak-type confinement systems -is correspondingly stressed. CONTENTS

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“…The experiments on fusion test reactor 7 demonstrated efficient core second harmonic tritium heating in D-T supershot plasmas with tritium concentration ranging from 6% to 40%. Phillips et al 8 observed efficient electron heating via mode conversion of fast waves to ion Bernstein waves in D-T, deuterium-deuterium ͑D-D͒, and deuterium-helium-4 ͑D- 4 He͒ plasmas with high concentrations of minority helium-3 ͑ 3 He͒. The experiments 9 on JET D-T plasma reveal that 6 MW of ICRH raises ion temperature up to 13 keV producing 1.66 MW of fusion power.…”

Section: Introductionmentioning

confidence: 94%

“…The experiments 9 on JET D-T plasma reveal that 6 MW of ICRH raises ion temperature up to 13 keV producing 1.66 MW of fusion power. Mantsinen et al 10 developed a technique to produce 3.5 MeV energy 4 He ions accelerated by ion-cyclotron resonance heating ͑ICRH͒ in nonactivating helium plasmas in JET. This technique permits the experimental simulation of trapped MeV-energy ␣ particles without the complications of a full-scale DT campaign.…”

Section: Introductionmentioning

confidence: 99%

Oscillating two stream instability of electromagnetic pump in the ion cyclotron range of frequency in a plasma

et al. 2009

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An analytical formalism of oscillating two stream instability of a large amplitude electromagnetic wave in the ion cyclotron range of frequency in a plasma is developed. The instability produces electrostatic ion cyclotron sidebands and a driven low frequency mode. The nonlinear coupling arises primarily due to the motion of ions and is strong when the pump frequency is close to ion cyclotron frequency and the oscillatory ion velocity is a significant fraction of acoustic speed. For propagation perpendicular to the ambient magnetic field, the X-mode pump wave produces flute type perturbation with maximum growth rate at some specific wavelengths, which are three to four times larger than the ion Larmor radius. For propagation at oblique angles to ambient magnetic field, the ion cyclotron O-mode, the growth rate increases with the wave number of the low frequency mode.

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Adiabatic Compression of the Tokamak Discharge

Cited by 75 publications

References 8 publications

Experiments on the Adiabatic Toroidal Compressor

Experiments on the Adiabatic Toroidal Compressor

Theory of plasma transport in toroidal confinement systems

Oscillating two stream instability of electromagnetic pump in the ion cyclotron range of frequency in a plasma

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