Abstract
Results are presented from the simulations of discharges with fast L-H transitions in the JET tokamak. During a transition, electron temperature perturbations propagate into the plasma core over a time much shorter than the transport time characteristic of this device. It is shown that the experimentally observed variations in the electron temperature may be caused by the change in the particle source intensity in the plasma when the atomic flux decreases, which is detected from the drop in the intensity of the Dα hydrogen spectral line. Hence, the experiments under consideration can be explained without the assumption about the nonlocal character of transport processes in tokamaks, which was made in some papers devoted to JET experiments. The plasma component responsible for the apparent nonlocal character of transport processes is the neutral component, whose propagation time across the plasma column is sufficiently short (t<100 µs).
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References
F. Wagner, G. Becker, K. Behringer, et al., Phys. Rev. Lett. 49, 1408 (1982).
Technical Basis for the ITER-FEAT Outline Design (2000).
Project RF DEMO (RRC Kurchatov Institute, Moscow, 2000), Part IV.
Asdex Team, Nucl. Fusion 29(11), 1959 (1989).
R. J. Groebner, Preprint No. GA-A21128 (General Atomics, San Diego, 1992).
P. Gohil, K. H. Burrell, E. J. Doyle, et al., Nucl. Fusion 34, 1057 (1994).
S. V. Neudatchin, J. G. Cordey, D. G. Muir, et al., Preprint No. JET-P(93)58 (JET, Ebington, 1992); S. V. Neudatchin, J. G. Cordey, and D. G. Muir, in Proceedings of the 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisbon, 1993, Part. I, p. 83; ECA 17C (1), 83 (1993)
T. K. Kurki-Suonio, K. H. Burrell, R. J. Groebner, et al., Nucl. Fusion 33, 301 (1993).
S. V. Neudatchin, H. Shirai, T. Takizuka, et al., in Proceedings of the 22nd EPS Conference on Controlled Fusion and Plasma Physics, Bournemous, 1995, Part III, p. 29; ECA 19C(3), 29 (1995).
J. G. Cordey, D. G. Muir, S. V. Neudatchin, et al., Plasma Phys. Controlled Fusion 36, A267 (1994).
J. G. Cordey, D. G. Muir, V. V. Parail, et al., Nucl. Fusion 35, 505 (1995).
V. M. Leonov, Preprint No. IAE-5659/6 (Kurchatov Institute of Atomic Energy, Moscow, 1993); Fiz. Plazmy 20, 381 (1994) [Plasma Phys. Rep. 20, 341 (1994)].
V. M. Leonov and A. R. Polevoj, in Proceedings of the 15th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Seville, 1994 (Vienna: IAEA, 1996), Vol. 3, p. 315.
K. H. Burrell, R. J. Groebner, and DIII-D Group, Report No. GA-C20051 (General Atomics, 1990).
JET Team, Plasma Phys. Controlled Fusion 32, 108 (1990).
G. V. Pereverzev, P. N. Yushmanov, A. Yu. Dnestrovskij, et al., Preprint No. 5358/6 (Kurchatov Institute of Atomic Energy, Moscow, 1991).
V. M. Leonov, in Proceedings of Workshop on Transport Barriers at Edge and Core in Three Large Tokamak Facilities, Naka, Japan, 2000.
V. M. Leonov, E. L. Romanova, and A. R. Polevoi, in Proceedings of the III All-Union Conference on Diagnostics of High Temperature Plasma, Dubna, 1983, p. 43.
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Translated from Fizika Plazmy, Vol. 28, No. 1, 2002, pp. 3–8.
Original Russian Text Copyright © 2002 by Leonov.
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Leonov, V.M. Simulations of tokamak discharges with fast L-H transitions. Plasma Phys. Rep. 28, 1–6 (2002). https://doi.org/10.1134/1.1434291
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DOI: https://doi.org/10.1134/1.1434291