Understanding LOC/SOC phenomenology in tokamaks

J. E. Rice (Corresponding author), J. Citrin, N. M. Cao, P. H. Diamond, M. Greenwald, B. A. Grierson

Research output: Contribution to journalArticleAcademicpeer-review

20 Citations (Scopus)


Phenomenology of Ohmic energy confinement saturation in tokamaks is reviewed. Characteristics of the linear Ohmic confinement (LOC) and saturated Ohmic confinement (SOC) regimes are documented and transformations in all transport channels across the LOC/SOC transition are described, including rotation reversals, 'non-local' cut-off and density peaking, in addition to dramatic changes in fluctuation intensity. Unification of results from nearly 20 devices indicates that the LOC/SOC transition occurs at a critical value of the product of the density, edge safety factor and device major radius, and that this product increases with toroidal magnetic field. Comparison with gyro-kinetic simulations suggests that the effects of sub-dominant TEMs are important in the LOC regime while ITG mode turbulence dominates with SOC.

Original languageEnglish
Article number105001
Number of pages20
JournalNuclear Fusion
Issue number10
Publication statusPublished - Oct 2020


  • Ohmic confinement
  • tokamaks
  • transport


Dive into the research topics of 'Understanding LOC/SOC phenomenology in tokamaks'. Together they form a unique fingerprint.

Cite this