Effects of flow shear on temperature gradient driven short wavelength modes

Gao, Zhe; Dong, J. Q.; Sanuki, H.
June 2004
Physics of Plasmas;Jun2004, Vol. 11 Issue 6, p3053
Academic Journal
The effects of flow shear on the temperature gradient driven short wavelength ion (SWITG) modes and electron temperature gradient (ETG) modes are investigated in a sheared slab. The SWITG mode can be stabilized at arbitrary β when the E×B velocity shear, VE′, reaches above a critical value. Since the SWITG mode has a lower frequency, a lower VE′ is needed to stabilize the SWITG mode than to stabilize the conventional ITG mode. However, the critical values of VE′ for stabilization of both SWITG and conventional ITG modes are much less than vti/Ln, where vti and Ln are ion thermal speed and the scale length of density gradient. Contrastively, the ETG mode cannot be stabilized until the VE′ is larger than vti/Ln. Similarly, a parallel velocity shear with order vti/Ln has significant effects on the SWITG mode but is too small to influence the ETG mode. The different behaviors of flow shear effects on the SWITG and ETG modes may indicate that the ETG mode is more reasonable than the SWITG as the candidate responsible for anomalous electron thermal transport. © 2004 American Institute of Physics.


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