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(TH4/1) Driftwave-Based Modeling of Poloidal Spin-up Precursor and Step-Wise Expansion of Internal Transport Barriers in Tokamaks

G. M. Staebler¹⁾, J. E. Kinsey^2)*, P. Zhu³⁾, G. Bateman²⁾, W. Horton³⁾, A. H. Kritz²⁾, T. Onjun²⁾, A. Pankin²⁾, and R. E. Waltz^1)
 
1) General Atomics, San Diego, California USA
²⁾ Lehigh University, Bethelehem, Pennsylvania, USA
³⁾ University of Texas-Austin, Austin, Texas USA
^* Present address: General Atomics

Abstract.  The rich phenomenology of internal transport barriers observed in tokamaks includes a poloidal spin-up precursor for balanced injection neutral beam heating and step-wise expansion of the barrier for unbalanced injection. Examples of numerical simulations of these phenomena are presented. Two driftwave-based predictive transport models (GLF23 and Multi-Mode) are used. Both models include the suppression of ion temperature gradient modes as the EB shear approaches the computed maximum linear growth rate. Modeling of discharges with internal transport barriers from the DIII-D, JET and TFTR tokamaks are compared.

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