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Reduced Physics Model of the Tokamak Scrape-off-Layer for Pulse Design

X. ZhangF. M. PoliE. D. EmdeeM. Podest\`a
Jun 2022
摘要
The dynamic interplay between the core and the edge plasma has importantconsequences in the confinement and heating of fusion plasma. The transport ofthe Scrape-Off-Layer (SOL) plasma imposes boundary conditions on the coreplasma, and neutral transport through the SOL influences the core plasmasourcing. In order to better study these effects in a self-consistent,time-dependent fashion with reasonable turn-around time, a reduced model isneeded. In this paper we introduce the SOL Box Model, a reduced SOL model thatcalculates the plasma temperature and density in the SOL given the core-to-edgeparticle and power fluxes and recycling coefficients. The analytic nature ofthe Box Model allows one to readily incorporate SOL physics in time-dependenttransport solvers for pulse design applications in the control room. Here wedemonstrate such a coupling with the core transport solver TRANSP and comparethe results with density and temperature measurements, obtained through Thomsonscattering and Langmuir probes, of an NSTX discharge. Implications for futureinterpretive and predictive simulations are discussed.
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