Multi-machine Scalings of n$=$1 and n$=$2 Error Field Correction

ORAL

Abstract

New power law scalings of the error field (EF) penetration thresholds across a wide range of tokamaks have been developed for toroidal mode numbers n$=$1 and 2. These scale the threshold in the EF aligned with the dominant mode of core resonant drive as calculated by GPEC and project values on the order of 1-10G for ITER (criteria the ITER tolerances and correction coils easily satisfy). Within the typical regimes of DIII-D, the nonlinear MHD code TM1 reproduces the primary scaling behaviors observed in experiments. However, not all experiments conform to the simple power scaling framework. Observations at high density in KSTAR and DIII-D show a regime transition that drastically alters the density scaling. Other anomalies are observable in the impact of nonresonant error fields, which can alter the threshold through rotation braking or impact on the L-H transition dynamics. These anomalies necessitate modification of the simple resonant scalings to better describe the EF correction challenge in ITER and existing tokamaks.

Authors

  • N. Logan

    PPPL, Princeton Plasma Physics Laboratory

  • J.-K. Park

    PPPL, Princeton Plasma Physics Laboratory

  • Qiming Hu

    PPPL, Princeton Plasma Physics Laboratory

  • S. M. Yang

    PPPL

  • C. Paz-Soldan

    General Atomics, GA, General Atomics, San Diego, CA

  • E.J. Strait

    General Atomics, GA

  • Stefano Munaretto

    General Atomics, GA

  • Yongkyoon In

    UNIST, Ulsan National Institute of Science and Technology

  • H. Wang

    IPP CAS PRC

  • T. Markovic

    IPP CAS CR, IPP-CAS

  • M. Maraschek

    MP-IPP

  • L. Piron

    CCFE

  • P. Piovesan

    RFX

  • Y. Gribov

    IO, ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France, ITER Organization