Suppression of Tearing Modes by Radio Frequency Current Condensation [Suppression of Tearing Modes by RF Current Condensation]

Reiman, A. H.; Fisch, N. J.

doi:10.1103/PhysRevLett.121.225001

Title: Suppression of Tearing Modes by Radio Frequency Current Condensation [Suppression of Tearing Modes by RF Current Condensation]

Journal Article · 29 November 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.121.225001 · OSTI ID:1485580

Reiman, A. H. ^[1]; Fisch, N. J. ^[1]

Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.

Currents driven by radio frequency (rf) waves in the interior of magnetic islands can stabilize deleterious tearing modes in tokamaks. Present analyses of stabilization assume that the local electron acceleration is unaffected by the presence of the island. However, the power deposition and electron acceleration are sensitive to the perturbation of the temperature. The nonlinear feedback on the power deposition in the island increases the temperature perturbation, and can lead to a bifurcation of the solution to the steady-state heat diffusion equation. The combination of the nonlinearly enhanced temperature perturbation with the rf current drive sensitivity to the temperature leads to an rf current condensation effect, which can increase the efficiency of rf current drive stabilization and reduce its sensitivity to radial misalignment of the ray trajectories. As a result, the threshold for the effect is in a regime that has been encountered in experiments, and will likely be encountered in ITER.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1485580

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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RF current condensation in magnetic islands and associated hysteresis phenomena Rodríguez, E.; Reiman, A. H.; Fisch, N. J. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5118424	journal	September 2019
Controlled neoclassical tearing mode (NTM) healing by fueling pellets and its impact on electron cyclotron current drive requirements for complete NTM stabilization Bardóczi, L.; Choi, M. J.; Bañón Navarro, A. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab472d	journal	October 2019

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