Dimensionless parameter scaling of intrinsic torque in C-Mod enhanced confinement plasmas

摘要

A dimensionless parameter dependence study of intrinsic torque has been performed on a database of H- and I-mode plasmas from the Alcator C-Mod tokamak. The torque was determined by comparing intrinsic angular momentum density profiles just before and just after L-H and L-I transitions. The intrinsic torque has been found to scale as β_N~(1.5) ρ_*~(-1.0)ν_*~(0.1), with the parameter ranges 0.3 ≤ β_N ≤ 1.5, 0.004 ≤ ρ_*≤ 0.011 and 0.04 ≤ ν_* ≤ 0.9. Comparison with results from JET and DⅢ-D suggests that the intrinsic torque should be normalized by some measure of the device size. Depending upon this normalization, the estimated total intrinsic torques for ITER, SPARC and ARC are ～20, ～4 and ～8 Nm, respectively.