Abstract
Temperatures, densities and confinement of deuterium plasmas confined in tokamaks have been achieved within the last decade that are approaching those required for a D-T reactor. As a result, the unique phenomena present in a D-T reactor plasma (D-T plasma confinement, alpha confinement, alpha heating and possible alpha driven instabilities) can now be studied in the laboratory. Recent experiments on the Tokamak Fusion Test Reactor (TFTR) have been the first magnetic fusion experiments to study plasmas with reactor fuel concentrations of tritium. The injection of ∼20 MW of tritium and 14 MW of deuterium neutral beams into the TFTR produced a plasma with a T/D density ratio of ∼1 and yielded a maximum fusion power of ∼9.2 MW. The fusion power density in the core of the plasma was ∼1.8 MW m−3 approximating that expected in a D-T fusion reactor. In other experiments TFTR has produced 6.4 MJ of fusion energy in one pulse satisfying the original 1976 goal of producing 1 to 10 MJ of fusion energy per pulse. A TFTR plasma with T/D density ratio of ∼1 was found to have ∼20% higher energy confinement time than a comparable D plasma, indicating a confinement scaling with average ion mass, A, of τE∼. The core ion temperature increased from 30 keV to 37 keV due to a 35% improvement of ion thermal conductivity. Using the electron thermal conductivity from a comparable deuterium plasma, about 50% of the electron temperature increase from 9 keV to 10.6 keV can be attributed to electron heating by the alpha particles. At fusion power levels of 7.5 MW, fluctuations at the Toroidal Alfvén Eigenmode frequency were observed by the fluctuation diagnostics. However, no additional alpha loss due to the fluctuations was observed. These D-T experiments will continue over a broader range of parameters and higher power levels.
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References
TFTR Project Management Plan, (1976). Princeton Plasma Physics Laboratory.
R. A. P. Sissingh and R. L. Rossmassler, (1990).Fus. Engrg. Des. 12, 383.
The JET Team, (1992).Nucl. Fusion 32, 187.
M. Bessenrodt-Weberpals et al, (1993).Nucl. Fusion 33, 1205 and references therein.
J. D. Strachan et al, (1987)Phys. Rev. Lett. 58, 1004.
R. J. Hawryluk et al, (1987).Plasma Phys. Contr. Fus. Res., Vol. 1, 51 (IAEA, Vienna).
M. G. Bell et al, (1989).Plasma Phys. Contr. Fus. Res., Vol. 1, 27 (IAEA, Vienna).
D. M. Meade et al, (1991).Plasma Phys. Contr. Fus. Res., Vol. 1, 9 (IAEA, Vienna).
M. E. Mauel, G. A. Navratil and S. A. Sabbagh, (1993).Plasma Phys. Contr. Fus. Res., Vol. 1, 205 (IAEA, Vienna).
J. M. Dawson, H. P. Furth and F. H. Tenney, (1971).Phys. Rev. Lett. 26, 1156.
R. J. Hawryluk et al, (1994).Phys. Rev. Lett. 72, 3530 and references therein.
J. D. Strachan et al, (1994).Phys. Rev. Lett. 72, 3526 and references therein.
S. C. Scott et al, (1993).Plasma Phys. Contr. Fus. Res., Vol. 3, 427 (IAEA, Vienna).
L. C. Johnsonet al,Rev. Sci. Instrum. 55, No. 1, Jan. 1995, to be published.
R. Budny et al, (1992).Nucl. Fusion 32, 429.
N. A. Uckan et al, (1991).Plasma Phys. Contr. Fus. Res., Vol. 3, 307 (IAEA, Vienna).
R. R. Parker,Trans Am Nucl. Soc., to be published.
C. Z. Cheng and M. S. Chance, (1986).Phys. Fluids 29, 3695.
K. L. Wong et al, (1991).Phys. Rev. Lett. 66, 1874.
H. Biglari et al, (1992).Phys. Fluids B 4, 2385.
N. J. Fisch and M. C. Hermann, (1994). Princeton Plasma Physics Laboratory Report PPPL-2989.
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Work supported by U.S. Department of Energy Contract No. DE-AC02-76-CHO-3073.
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Meade, D.M., the TFTR Team. D-T experiments on TFTR. J Fusion Energ 13, 145–154 (1994). https://doi.org/10.1007/BF02213952
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DOI: https://doi.org/10.1007/BF02213952