Transport experiments in Alcator-C-Mod
Greenwald, M. ; Boivin, R. L. ; Bonoli, P. ; Christensen, C. ; Fiore, C. ; Garnier, D. ; Goetz, J. ; Golovato, S. ; Graf, M. ; Granetz, R. ; Horne, S. ; Hsu, T. ; Hubbard, A. ; Hutchinson, I. ; Irby, J. ; Kurz, C. ; LaBombard, B. ; Lipschultz, B. ; Luke, T. ; Marmar, E. ; McCracken, G. ; Niemczewski, A. ; O'Shea, P. ; Porkolab, M. ; Rice, J.
[S.l.] : American Institute of Physics (AIP)
Published 1995
[S.l.] : American Institute of Physics (AIP)
Published 1995
| ISSN: |
1089-7674
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
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. © 1995 American Institute of Physics.
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| Type of Medium: |
Electronic Resource
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| URL: |