共查询到20条相似文献,搜索用时 15 毫秒
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Hawryluk RJ Adler H Alling P Ancher C Anderson H Anderson JL Ashcroft D Barnes CW Barnes G Batha S Bell MG Bell R Bitter M Blanchard W Bretz NL Budny R Bush CE Camp R Caorlin M Cauffman S Chang Z Cheng CZ Collins J Coward G Darrow DS DeLooper J Duong H Dudek L Durst R Efthimion PC Ernst D Fisher R Fonck RJ Fredrickson E Fromm N Fu GY Furth HP Gentile C Gorelenkov N Grek B Grisham LR Hammett G Hanson GR Heidbrink W Herrmann HW Hill KW Hosea J Hsuan H Janos A Jassby DL Jobes FC Johnson DW 《Physical review letters》1994,72(22):3530-3533
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Steinmetz K Noterdaeme J Wagner F Wesner F Bäumler J Becker G Bosch HS Brambilla M Braun F Brocken H Eberhagen A Fritsch R Fussmann G Gehre O Gernhardt J v Gierke G Glock E Gruber O Haas G Hofmann J Hofmeister F Izvozchikov A Janeschitz G Karger F Keilhacker M Klüber O Kornherr M Lackner K Lisitano G van Mark E Mast F Mayer HM McCormick K Meisel D Mertens V Müller ER Murmann H Niedermeyer H Poschenrieder W Puri S Rapp H Röhr H Ryter F Schmitter K Schneider F Setzensack C Siller G Smeulders P 《Physical review letters》1987,58(2):124-127
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B. B. Kadomtsev 《Radiophysics and Quantum Electronics》1986,29(9):781-787
Conclusions The observed tendency for certain optimal current-density and pressure profiles to be maintained can be interpreted if one assumes a relaxed state in the plasma, which corresponds to minimal total energy for a given current. With optimal power deposition, when the current-density and pressure profiles also remain optimal, ohmic scaling may be maintained up to fairly high densities, i.e., fairly high p. If the power deposition profile deviates from optimal, the plasma resists deviation from the optimal profiles, and the more so the higher p. The thermal-conductivity profile is modified to maintain the relaxed state. Nonoptimal profiles may lead to degradation in the global energy lifetime E, which can be related phenomenologically to pumping of magnetic noise by the excess free energy F. Our argument provides a qualitative explanation of the self-organization physics.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 29, No. 9, pp. 1032–1040, September, 1986. 相似文献
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An α particle transport equation has been solved analytically in one-dimensional spherical geometry when the plasma properties are uniform in space and time. The results agree well with earlier results. 相似文献
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Highcock EG Barnes M Schekochihin AA Parra FI Roach CM Cowley SC 《Physical review letters》2010,105(21):215003
The effect of flow shear on turbulent transport in tokamaks is studied numerically in the experimentally relevant limit of zero magnetic shear. It is found that the plasma is linearly stable for all nonzero flow shear values, but that subcritical turbulence can be sustained nonlinearly at a wide range of temperature gradients. Flow shear increases the nonlinear temperature gradient threshold for turbulence but also increases the sensitivity of the heat flux to changes in the temperature gradient, except over a small range near the threshold where the sensitivity is decreased. A bifurcation in the equilibrium gradients is found: for a given input of heat, it is possible, by varying the applied torque, to trigger a transition to significantly higher temperature and flow gradients. 相似文献
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T. Cho S. Kubo M. Ikeda M. Nakamura Y. Terumichi Y. Hamada S. Tanaka 《Physics letters. A》1980,80(4):269-272
When a high power microwave is injected into a tokamak plasma, the intensities of microwave radiations emitted from the plasma and those of impurity lines are increased. Such increases are observed only when the electron cyclotron resonance field is present in the torus. The upper hybrid resonance heating is also observed near the plasma surface. 相似文献
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Piras F Coda S Duval BP Labit B Marki J Medvedev SY Moret JM Pitzschke A Sauter O;TCV Team 《Physical review letters》2010,105(15):155003
An edge-localized mode (ELM) H-mode regime, supported by electron cyclotron heating, has been successfully established in a "snowflake" (second-order null) divertor configuration for the first time in the TCV tokamak. This regime exhibits 2 to 3 times lower ELM frequency and 20%-30% increased normalized ELM energy (ΔWELM/Wp) compared to an identically shaped, conventional single-null diverted H mode. Enhanced stability of mid- to high-toroidal-mode-number ideal modes is consistent with the different snowflake ELM phenomenology. The capability of the snowflake to redistribute the edge power on the additional strike points has been confirmed experimentally. 相似文献
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H. De Kluiver R. Barth H.J.B.M. Brocken J.J.L. Caarls B. De Groot H.W. Kalsbeek H.W. Piekaar B. De Stigter H.W.H. Van Andel H.W. Van der Ven 《Physics letters. A》1977,62(3):157-160
Results on plasma confinement, heating, suprathermal radiation and overall conductivity together with the time development of radial current density profiles during current-driven turbulence in the toroidal device “TORTUR” are reported. 相似文献
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V. V. D’yachenko M. A. Irzak E. N. Tregubova O. N. Shcherbinin 《Technical Physics》2003,48(8):1061-1066
Feasibility of rf plasma heating in the Globus-M spherical tokamak at frequencies several times higher than the ion cyclotron
frequency is considered. Results from a numerical analysis of this problem by using one-and two-dimensional codes are presented.
It is shown that, for the plasma parameters attainable in this device, the single-pass absorption of fast magnetosonic waves
reaches 60%. The energy is released near the plasma axis. The radiation resistance of a one-loop antenna should be close to
1 Ω. The design of an antenna that allows one to match the rf oscillator to the load is described. The parameters of the antenna
resonator required for optimum operation of the antenna are given. 相似文献
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Dong J. Montalvo E. Carrera R. Rosenbluth M.N. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(2):93-98
In a fusion experiment based on the single-turn tokamak concept, the plasma is surrounded by a massive conducting structure composed of several layers of material with different resistivities. This conducting shell is located near the plasma edge and is magnetically coupled to the plasma column. The plasma magnetohydrodynamic (MHD) equilibrium is studied by neglecting the effect of structural induced currents. Eddy current effects are then analyzed. Poloidal uniformization of the poloidal field magnet current distribution required for plasma equilibrium is demonstrated. The possibility of continuous-limiter discharges in a single-turn tokamak configuration is pointed out. The significance of these results for the operation of a high-current tokamak experiment is discussed 相似文献
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M. Valovič 《Czechoslovak Journal of Physics》1990,40(6):673-677
A simple ohmic heating circuit for the CASTOR tokamak is described. A test 19 kA discharge with duration of 40 ms is presented.The author thanks to Mr. J. Zelenka who made the most parts of the system. 相似文献
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A Fokker-Planck study is carried out for tokamak electron cyclotron resonance heating by writing the quasi-linear diffusion operator into a form adaptive to the collision operator and considering the wave absorption characteristics of both the O-mode and the X-mode in different magnetic surfaces. Though the Fokker-Planck code is non-relativistic in nature, however, if the relativistic resonance condition for the nearly perpendicularly propagating waves is treated suitably, we can obtain correct results. The energy loss mechanism through anomalous transport is also modelled using a suitable loss term. In the heating phase, the electron distribution deviates from the Maxwellian distribution substantially, which leads to non-linear absorption characteristics. The wave damping rate is non-linear and changes with time. The electron pressure is usually anisotropic under different conditions: p_{e⊥}/p_{e‖}>2 for different D_0 and τ_e. 相似文献