Plasma elongation effect on the parity change in global electromagnetic ion temperature gradient modes and intrinsic rotation generation

A study is made of the effect of plasma elongation ( kappa) on parity of a global electromagnetic (EM) ion temperature gradient mode and intrinsic rotation generation. An odd parity component of the mode is generated by global EM effects and increases with beta (=plasma thermal energy/magnetic energy), enhancing the symmetry breaking and subsequent Reynolds stress [Kaang et al., Phys. Plasmas 25, 012505 (2018)]. The plasma elongation is shown to diminish the parity change via the reduction in the effective ion temperature gradient by a factor alpha = 1 - E & PRIME;, where E = r ( kappa - 1 ) / ( kappa + 1 ). A quasi-linear analysis indicates that plasma elongation can weaken the generation of intrinsic torque induced by the global EM effect as a result of the decline of the parity change.