Impurity accumulation and performance of ITER and DEMO plasmas in the presence of transport barriers

International Nuclear Science and Technology Conference 2016

Chatthong, B.^1 ; Promping, J.^2 ; Onjun, T.^3

Department of Physics, Faculty of Science, Prince of Songkla University, Songkla, Hat Yai, Thailand^1

Thailand Institute of Nuclear Technology, Bangkok, Thailand^2

School of Manufacturing Systems and Mechanical Engineering, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, Thailand^3

关键词: Anomalous transport;    Density profile;    Impurity accumulations;    Neoclassical transport model;    Plasma performance;    Plasma temperature;    Predictive modelling;    Transport barrier;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/860/1/012034/pdf
DOI  :  10.1088/1742-6596/860/1/012034

来源: IOP

【 摘 要 】

In this work, the impurity accumulations and their performance in the presence of both ITB and ETB in ITER and DEMO plasmas are investigated using a BALDUR integrated predictive modelling code. In these simulations, a combination of a neoclassical transport model NCLASS and an anomalous transport model Mixed Bohm/gyro-Bohm is used. The boundary condition is described at the top of the pedestal, which is calculated theoretically based on a combination of magnetic and flow shear stabilization pedestal width scaling and an infinite-n ballooning pressure gradient model. The toroidal flow is calculated based on the NTV (neoclassical toroidal viscosity) toroidal velocity model. The time evolution of plasma temperature and density profiles of ITER and DEMO (Korean K-DEMO and Japanese DEMO models A, B and C) plasmas are simulated in H-mode scenario with and without ITB formation. It is found that Japanese DEMO model C yields highest plasma temperature; while Korean DEMO yields the best plasma performance among those designs considered. Impurity accumulation is found to be highest in Japanese DEMO model B.