The EPED Pedestal Model: Validation, Super H-Mode, and Core-Pedestal Coupling

POSTER

Abstract

The EPED model predicts the H-Mode pedestal height and width by calculating non-local peeling-ballooning and kinetic ballooning mode constraints. Comparisons of EPED predictions to observations in more than 700 cases on 5 tokamaks, show agreement to a standard deviation of $\sim$ 20-25$\%$. The effects of plasma shape, collisionality, and impurities are explored. EPED predicts the pedestal can in some cases have multiple self-consistent solutions, including a higher pressure ``Super H'' solution, which can be reached by controlling density evolution. Comparisons of Super H predictions to DIII-D observations, and Super H predictions for other devices will be presented. Recently, the AToM project has coupled EPED to core transport models, enabling self-consistent prediction of temperature and pressure profiles, and global stored energy, across the confined plasma. Predictions for existing devices and for ITER are discussed.

*Supported in part by US DOE under DE-FG03-95ER54309, DE-FC02-06ER54873, DE-FC02-04ER54698.

Authors

  • P.B. Snyder

    • General Atomics
    • GA
  • E.A. Belli

    • GA
  • K.H. Burrell

    • GA
  • A. Garofalo

    • GA
  • R.J. Groebner

    • GA
  • O. Meneghini

    • GA
  • T.H. Osborne

    • GA
  • W.M. Solomon

    • PPPL
  • J.M. Park

    • ORNL
  • J.W. Hughes

    • MIT
  • M.N.A. Beurskens

    • CCFE
  • H.R. Wilson

    • U. of York