Distributions of Alpha Particles Escaping to the Wall Because of Sawtooth Oscillations in TFTR. PDF Download
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Author: Ya. I. Kolesnichenko
Publisher:
ISBN:
Category : Dynamics of a particle
Languages : en
Pages : 61
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Book Description
Author: Ya. I. Kolesnichenko
Publisher:
ISBN:
Category : Dynamics of a particle
Languages : en
Pages : 61
Get Book Here
Book Description
Author: Ya. I. Kolesnichenko
Publisher:
ISBN:
Category : Dynamics of a particle
Languages : en
Pages : 61
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Radially resolved confined alpha particle energy and density distributions are routinely measured on TFTR using two diagnostics: PCX and[alpha]-CHERS. The Pellet Charge-eXchange (PCX) diagnostic uses the ablation cloud formed by an impurity pellet (Li or B) for neutralization of the alphas followed by analysis of the escaping helium neutrals. PCX detects deeply trapped alpha particles in the energy range 0.5 - 3.8 MeV. The[alpha]-CHERS technique, were the alpha signal is excited by charge-exchange between alphas and the deuterium atoms of one of the heating beams and appears as a wing on the He[sup+] 468.6 nm line, detects mainly passing alphas in the range of 0.15 - 0.7 MeV. Studies of alpha losses during DT experiments on TFTR have also been conducted using lost alpha detectors located on the walls of the plasma chamber. All of these diagnostics were used for investigating the influence of sawtooth crashes on alphas in high power D-T discharges in TFTR. Both PCX and[alpha]-CHERS measurements show a strong depletion of the alpha core density and transport of trapped alphas radially outwards well beyond q= 1 surface after a sawtooth crash. Lost alpha detectors measure bursts of alpha loss of the previously confined alphas (
Author:
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Category : Electronic journals
Languages : en
Pages : 436
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Author:
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Category :
Languages : en
Pages :
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Results from recent DT experiments on TFTR to measure the radial density profiles of fast confined well trapped[alpha]-particles using the Pellet Charge eXchange (PCX) diagnostic[PETROV M.P., et. al. Nucl. Fusion, 35 (1995) 1437] indicate that sawtooth oscillations produce a significant broadening of the trapped alpha radial density profiles.' Conventional models consistent with measured sawtooth effects on passing particles do not provide satisfactory simulations of the trapped particle mixing measured by PCX diagnostic. We propose a different mechanism for fast particle mixing during the sawtooth crash to explain the trapped[alpha]-particle density profile broadening after the crash. The model is based on the fast particle orbit averaged toroidal drift in a perturbed helical electric field with an adjustable absolute value. Such a drift of the fast particles results in a change of their energy and a redistribution in phase space. The energy redistribution is shown to obey the diffusion equation, while the redistribution in toroidal momentum P[var-phi] (or in minor radius) is assumed stochastic with large diffusion coefficient and was taken flat. The distribution function in a pre- sawtooth plasma and its evolution in a post-sawtooth crash plasma is simulated using the Fokker-Planck Post-TRANSP (FPPT) processor code. It is shown that FPPT calculated[alpha]-particle distributions are consistent with TRANSP Monte-Carlo calculations. Comparison of FPPT results with Pellet Char eXchange (PCX) measurements shows good agreement for 9 both sawtooth free and sawtoothing plasmas.
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ISBN:
Category : Chemistry
Languages : en
Pages : 2664
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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 484
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Author: International Atomic Energy Agency
Publisher: Fusion Energy 1996
ISBN:
Category : Business & Economics
Languages : en
Pages : 956
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Book Description
Proceedings of the Sixteenth International Conference, formerly called the International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Montreal, 7-11 October 1996. The papers presented reflect the excellent progress achieved since the last conference in Seville 1994. Among many other achievements, the Tokamak Fusion Test Reactor has produced over 10 MW of fusion power, the JT-60U experiment has demonstrated plasma conditions equivalent to breakeven, the reversed shear mode has been demonstrated, low aspect ratio tokamaks have produced promising results and plans have been drawn up for powerful new inertial confinement fusion experiments.
Author: Francis F. Chen
Publisher: Springer Science & Business Media
ISBN: 1475755953
Category : Science
Languages : en
Pages : 427
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TO THE SECOND EDITION In the nine years since this book was first written, rapid progress has been made scientifically in nuclear fusion, space physics, and nonlinear plasma theory. At the same time, the energy shortage on the one hand and the exploration of Jupiter and Saturn on the other have increased the national awareness of the important applications of plasma physics to energy production and to the understanding of our space environment. In magnetic confinement fusion, this period has seen the attainment 13 of a Lawson number nTE of 2 x 10 cm -3 sec in the Alcator tokamaks at MIT; neutral-beam heating of the PL T tokamak at Princeton to KTi = 6. 5 keV; increase of average ß to 3%-5% in tokamaks at Oak Ridge and General Atomic; and the stabilization of mirror-confined plasmas at Livermore, together with injection of ion current to near field-reversal conditions in the 2XIIß device. Invention of the tandem mirror has given magnetic confinement a new and exciting dimension. New ideas have emerged, such as the compact torus, surface-field devices, and the EßT mirror-torus hybrid, and some old ideas, such as the stellarator and the reversed-field pinch, have been revived. Radiofrequency heat ing has become a new star with its promise of dc current drive. Perhaps most importantly, great progress has been made in the understanding of the MHD behavior of toroidal plasmas: tearing modes, magnetic Vll Vlll islands, and disruptions.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 732
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