Realistic reversed magnetic shear (RS) discharges for the HL-2A
tokamak are simulated with the TRANSP code. Early NBI
heating achieves reversed shear (RS) configurations characterized by highly
peaked pressure profiles and a narrow shear reversal region. To avoid excessive
peaks in the pressure, and to sustain RS operation towards steady state,
LHCD is used to control the current profile. The combined LH and bootstrap current
create a quasi-stationary RS discharge with rmin/a ≈ 0.6
and qmin ≈ 2.8. A self-consistent internal transport barrier is produced,
and the RS configuration is established with a wider shear reversal region and broader
pressure profile that is favourable to achieving the high beta limit.
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