Year: 1985
Type: article
Abstract: The empirical scaling of the electron thermal diffusivity, χ e , is investigated for more than 100 beam-heated discharges. These discharges include two major features: 1) high-temperature and high-density plasma (T e (0)≈T i (0)≈2.5–3 keV at e ≈(5–7) × 10 13 cm −3 , P NBI ⪅ 4 MW), which will be the basis for the breakeven experiments in the next-generation tokamaks, 2) three types of discharges, i.e. good and poor confinement divertor discharges and limiter discharges. – All kinds of discharges (good heating and poor heating divertor discharges, limiter discharges) have fhe same functional form in χ e within ∼ 40% at 0.25 a < r < 0.65 a, where χ e in the simplest expression scales as χ e ∝ 1/n e . The ion thermal diffusivity, χ i , is consistent with the assumption that the neoclassical χ i can be applicable to our three kinds of discharges. For discharges with different heating efficiency, there is no systematic difference, in the adjustable multiplier, to the neoclassical theory by Hinton-Hazeltine for an ion collisionality of ν i * = 0.02–0.5.
Source: Nuclear Fusion
Authors: M. Kasai, M. Nagami, M. Otsuka, H. Aikawa, A. Kitsunezaki, T. Kobayashi, S. Konoshima, T. Matsuda, H. Ninomiya, M. Shimada, H. Yokomizo, T. Angel, F. Blau, R. Chase, E. Fairbanks
Institutions: Japan Atomic Energy Agency, Hitachi (Japan)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funder: U.S. Department of Energy
OpenAlex ID: W2012155509