Transport experiments in Alcator-C-Mod

M. Greenwald, R.L. Boivin, P. Bonoli, C. Christensen, C. Fiore, D. Garnier, J. Goetz, S. Golovato, M. Graf, R. Granetz, S. Home, T. Hsu, A. Hubbard, I. Hutchinson, J. Irby, C. Kurz, B. LaBombard, B. Lipschultz, T. Luke, E. MarmarG. McCracken, A. Niemczewski, P. O'Shea, M. Porkolab, J. Rice, J. Reardon, J. Schachter, J. Snipes, R. Stek, Y. Takase, J. Terry, M. Umansky, R. Watterson, S. Wolfe, F. Bombarda, M. May, B. Welch

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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 τIshowing 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. © 1995 American Institute of Physics.
Original languageEnglish
Pages (from-to)2308 - 2313
Number of pages6
JournalPhysics of Plasmas
Volume2
Issue number6
DOIs
Publication statusPublished - 1995
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Greenwald, M., Boivin, R. L., Bonoli, P., Christensen, C., Fiore, C., Garnier, D., ... Welch, B. (1995). Transport experiments in Alcator-C-Mod. Physics of Plasmas, 2(6), 2308 - 2313. https://doi.org/10.1063/1.871254