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Author: Maxwell D. Hill
Requested Type: Poster
Submitted: 2018-03-01 23:53:29

Co-authors: R. W. King, W. M. Stacey

Contact Info:
Georgia Institute of Technology
North Ave NW
Atlanta, GA   30332

Abstract Text:
The Miller equilibrium model for generating flux surface geometry [1] has been extended to include the poloidally non-uniform flux surface expansion that occurs in the X-point region(s) of diverted tokamaks. Equations for elongation and triangularity are modified to include a poloidally varying component and the formula for grad-r, which is used in the calculation of the poloidal magnetic field, is rederived.

Initial results suggest that strong quantitative agreement with experimental flux surface reconstructions and strong qualitative agreement with poloidal magnetic fields can be obtained using this model. Applications [2] are discussed. Major new applications include improved calculation of poloidal asymmetries in rotation studies, as well as the automatic generation of the computation mesh in the plasma edge, scrape-off layer, plenum and divertor regions for use in the GTNEUT [3] neutral particle transport code, enabling this powerful analysis code to be routinely run in experimental analyses.

1) Phys. Plasmas 5 (1998) 973-978; 2) Phys. Plasmas 15 (2008) 122505; 3) Comp. Phys. Comm. 161 (2004): 36-64.