Transport experiments in Alcator-C-Mod
Year: 1995
Type: article
Abstract: A series of transport experiments has been carried out in Alcator-C-Mod. [Phys Plasmas 1, 1511 (1994)]. Data from both Ohmic and ICRF (ion cyclotron range of frequencies) heated plasmas can be fitted with an L-mode (low mode) scaling law. The Ohmic τE’s show no scaling with density in any regime and can reach values of 2–3 times neo-Alcator. Impurity confinement has been studied with the laser blow-off technique with τI showing nearly linear scaling with plasma current. Ohmic and ICRF H modes are obtained over a wide range of discharge parameters, extending the range in the international database for nB, by almost a factor of 10. The power threshold for ELM-free (edge localized mode) discharges is in rough agreement with the scaling P/S=0.044nB. Energy diffusivities of Ohmic and ICRF heated plasmas have been measured from local analysis of plasma profiles and power fluxes. The same analysis produces a value for plasma resistivity which lies between the Spitzer and neoclassical calculations. Analysis of plasma transients have yielded values for particle diffusivity and convection velocity.
Source: Physics of Plasmas
DOI: 10.1063/1.871254
Authors: M. Greenwald, R. L. Boivin, P. Bonoli, C. Christensen, C. Fiore, D. Garnier, J. Goetz, S. Golovato, M. Graf, R. Granetz, S. Horne, T. Hsu, A. Hubbard, I. Hutchinson, J. Irby, C. Kurz, B. LaBombard, B. Lipschultz, T. Luke, E. Marmar, G. McCracken, A. Niemczewski, P. O’Shea, M. Porkolab, J. Rice, J. Reardon, J. Schachter, J. Snipes, P. Stek, Y. Takase, J. Terry, M. Umansky, R. Watterson, S. Wolfe, F. Bombarda, M. May, B. Welch
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
OpenAlex ID: W2038835948