Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.k1021z&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #K1.021
Physics
Scientific paper
The excitation of an impurity mode [1, 2] at the plasma edge is considered as the signature of the I-Regime [3]. The mode phase velocity, predicted in the electron diamagnetic velocity direction, was confirmed by the experiments [4]. The outward impurity transport produced by this mode is consistent with the observation that impurities accumulate at the edge in the I-Regime, a feature not present in the EDA or Elmy H-Regime. The plasma spontaneous rotation in the ion diamagnetic velocity direction is also consistent with the mode phase velocity direction, according to the Accretion Theory[5] of this phenomenon. In accordance with our theory, the I-Regime exhibits a temperature ``knee'' at the edge but no density ``knee'' as the mode excitation involves large values of dTi/dni. A correlation of the values of the observed poloidal magnetic field fluctuations with those of the derived density fluctuations is provided by the same theory.[4pt] [1] B. Coppi, et al., Phys. Rev. Lett. 17, 377 (1966).[0pt] [2] B. Coppi and T. Zhou, Phys. Lett. A 375, 2916 (2011); PoP 18 (2011)(in press) and MIT-LNS Report HEP 09/04 (2009).[0pt] [3] A. Hubbard, et al., PoP 18, 056115 (2011).[0pt] [4] I. Cziegler(2010).[5]B. Coppi, Nucl. Fusion 42, 1 (2002).
Coppi Bruno
Zhou Tianchun
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