Abstract Details
Abstracts
Author: Xin Zhang
Requested Type: Consider for Invited
Submitted: 2024-04-05 13:18:09
Co-authors: M.S. Anastopoulos Tzanis, M. Romanelli, F.M. Poli, M. Moscheni, P.F. Buxton, T. O’Gorman, H. Lowe, E. D. Emdee, the ST40 Team, and the NSTX-U Team
Contact Info:
Tokamak Energy
173 Brook Drive
Abingdon, OX14 4S
United Kingdom
Abstract Text:
The dynamic interplay between the core and edge plasmas has significant impact on various aspects of a reactor scenario design. The transport of the SOL plasma determines the plasma conditions at the separatrix, which poses boundary conditions for core transport. The plasma edge also impacts myriad particle transport processes, which has implications on core plasma fuelling, impurity transport, as well as divertor survivability. A core-edge integrated approach is therefore necessary to produce plasma scenarios that are consistent with both core and edge transport. A reduced model for the SOL, the so-called SOL Box Model, has been previously developed to calculate upstream conditions based on core to edge transport in a time-dependent simulation, and applied to analysis of NSTX-U plasmas with TRANSP [1]. Here we present predictive studies of ST40 plasmas with TRANSP-GLF23 and Astra-TGLF, with self-consistent separatrix boundary conditions provided by the 0D SOL Box Model. Free parameters of the SOL model will be constrained using experimental measurements and high-fidelity simulations. The predictions will be compared with existing measurements of core plasma profiles as well as divertor plasma measurements in ST40 diverted discharges. A 1D extension of the Box model that includes power, momentum, and particle balance will also be presented, along with comparison of calculated 1D profiles against SOLPS-ITER simulations of NSTX-U discharges. Implications for Fusion Pilot Plant conceptual designs and directions for future improvements will be discussed.
[1]Zhang, Xin, et al. "Reduced physics model of the tokamak Scrape-Off-Layer for pulse design." Nuclear Materials and Energy 34 (2023): 101354.
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