Edge Plasma Mode as the Signature of the EDA H-Regime

Details Edge Plasma Mode as the Signature of the EDA H-Regime Edge Plasma Mode as the Signature of the EDA H-Regime

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.s1046b&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #S1.046

Physics

Scientific paper

A deep Er-well observed in the EDA H-Regime produced by the Alcator C-Mod machine is considered as inducing a sharp localization of the Quasi-Coherent Mode proposed as the signature of this regime. This has a phase velocity in the ion diamagnetic velocity direction, in the plasma reference frame [1], and is a ``viscous-ballooning-mode'' driven by the combined effects of the plasma pressure gradient and the magnetic field curvature that would be stable due to FLR effects in the absence of a finite viscosity î. The frequency is near φdi≡kφvdi where vdi≡-[c/(e nBθ)]d pi/dr and kφ= n^0/R. The relevant model dispersion relation [2] obtained for a plane geometry in which the magnetic field curvature is simulated by an effective gravity is (φ+iγμ)(φ-φdi)=-2̂IC+ k^2vA^2/[1+i k^2Dm/(φ-φ*e)], where γμî, γIC is the interchange growth rate, Dm≡c^2η/(4π), η is the longitudinal resistivity and φ*e≡[ckφTe/(enBθ)](dn/dr)(1+1.71dTe/dne).[4pt] [1] I. Cziegler (2010).[0pt] [2] B. Coppi, et al., Ann. Phys. 121,1 (1979)

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