(TH/P8-31) Pedestal Temperature Models with Self-Consistent Calculation of Safety Factor and Magnetic Shear

S. Suwanna1), T. Onjun1), P. Leekhaphan1), D. Sukboon1), P. Thanasutives1), R. Picha2), N. Poolyarat3), O. Onjun4)
 
1) Sirindhorn International Institute of Technology, Thammasat University, Pathumthani, Thailand
2) Thailand Institute of Nuclear Technology, Bangkok, Thailand
3) Department of Physics, Thammasat University, Pathumthani, Thailand
4) Department of Science Service, Ministry of Science and Technology, Bangkok, Thailand

Abstract.  In this work, three pedestal temperature models in the work by T. Onjun [1] are improved by using a real time self-consistent values of safety factor and magnetic shear, which are acquired from 1.5 D BALDUR integrated predictive modelling code. This modification results in a better estimation of pedestal width and pedestal pressure gradient since the geometrical and bootstrap current effects are properly included. The modified pedestal temperature models are used together with a core transport model to describe the H-mode discharges obtained from DIII-D and JET tokamak experiments. The core transport used in this work is either the Mixed Bohm/gyro-Bohm (Mixed B/gB) core transport model or the Multimode (MMM95) core transport model. For each discharge, profiles of electron density, electron temperature and ion temperature from simulations, as well as their values at the top of the pedestal, are compared with the corresponding experimental data from the DIII-D and JET tokamaks. It is found that the predicted pedestal values are in the range of the corresponding experimental data and the profiles yield reasonable agreement with the data near the pedestal, but show high deviation near the plasma-core region. The RMS errors of each profile from each discharge, as well as the offset, are calculated to quantify the agreement.

[1] T. Onjun, et al., Physics of Plasma 9, 5018 (2002).

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