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"Changes in rotation have been observed in LHCD experiments  From these observations  reversals in intrinsic torque have been inferred  This paper identifies the mechanism for intrinsic torque reversal linked to magnetic shear       Gyrokinetic simulations demonstrate that as compared to the normal    case  the intrinsic torque reverses  for        crit  Analysis shows that the reversal occurs due to the dominance of the symmetry breaking mechanism in residual stress due to the synergy of toroidal coupling and the intensity gradient  This mechanism is a consequence of ballooning structure at weak     Gyrokinetic simulation gives   crit     0 3 for trapped electron modes  TEM  and   crit     1 1 for ion temperature gradient  ITG  modes  The value of   crit is consistent with results from the Alcator C-Mod LHCD experiments  for which      0 in the whole plasma column and   crit     0 2     0 3 exp  Rice et al Phys  Rev  Lett  111 125003  "
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