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

J. E. Rice (Corresponding Author), N. M. Cao, Tuomas Tala, C. Chrystal, M. J. Greenwald, J. W. Hughes, E. S. Marmar, M. L. Reinke, P. Rodriguez Fernandez, Antti Salmi

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8 Citations (Scopus)


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 β1.5Nρ∗-1.0ν0.1, with the parameter ranges 0.3 ≤ βN≤ 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.

Original languageEnglish
Article number026013
JournalNuclear Fusion
Issue number2
Publication statusPublished - Feb 2021
MoE publication typeA1 Journal article-refereed


  • H-mode
  • I-mode
  • Intrinsic torque
  • Tokamak


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