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

Rice, J. E.; Cao, N. M.; Tala, T.; Chrystal, C.; Greenwald, M. J.; Hughes, J. W.; Marmar, E. S.; Reinke, M. L.; Rodriguez Fernandez, P.; Salmi, A.

doi:10.1088/1741-4326/abcb26

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

Journal Article · Tue Jan 12 00:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abcb26· OSTI ID:1897107

^[1];

^[1]; Tala, T. ^[2];

^[3]; Greenwald, M. J. ^[1];

^[1]; Marmar, E. S. ^[1]; Reinke, M. L. ^[4];

^[1]; Salmi, A. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
VTT Technical Research Centre (Finland)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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. Here, 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 $${\beta }_{N}^{ 1.5}\enspace {\rho }_{{\ast}}^{-1.0}\enspace {\nu }_{{\ast}}^{0.1}$$, with the parameter ranges 0.3 $$\leqslant$$ β_N $$\leqslant$$ 1.5, 0.004 $$\leqslant$$ ρ* $$\leqslant$$ 0.011 and 0.04 $$\leqslant$$ ν_* $$\leqslant$$ 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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Research Council (ERC)

Grant/Contract Number:: SC0014264; FC02-04ER54698; 633053

OSTI ID:: 1897107

Journal Information:: Nuclear Fusion, Vol. 61, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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