รหัสดีโอไอ 10.14457/TU.the.2019.743
Title Study of particle and impurity behaviors in H-mode tokamak plasma
Creator Wannapa Buangam
Contributor Paiboon Sreearunothai, Advisor
Publisher Thammasat University
Publication Year 2019
Keyword Particle transport ,Impurity ,E×B flow shear ,Density peaking
Abstract The prediction capability of hydrogen isotope and impurity density profiles in H-mode plasma by MMM95 is investigated by using MMM95. The BALDUR code is used to simulate the core profiles in JET H-mode scenarios, employing a combination of the MMM95 core transport model and the NCLASS neoclassical transport model. By comparing the simulated profiles with experimental data, multi-parameter optimization is used to extract suitable coefficients for an MMM95 transport model that would include impurity transports. Moreover, the parameters (e.g. temperature, pressure and density) at the top of the pedestal have a strong influence on the performance of H-mode discharge. Therefore, if we can predict these parameters at the top of pedestal well, the prediction in the tokamak performance will be well done. So, we also aim to develop the pedestal density models for predicting the density values at the top of the pedestal for deuteron and carbon ion in H-mode plasma. Predictive simulation study on ITER by MMM95 core transport model and pedestal density model with difference impurity scenarios. In addition, it is well-known that the injected power significantly degrades the thermal energy confinement time. However, recent power scan experiments performed at JET-ILW with neutral beam injection (NBI) power showed that the power degradation of thermal energy confinement was weaker than that expected from IPB98(y,2) scaling, resulting in a weak decrease of normalized thermal energy confinement at high power. Additionally, there are indications that E×B flow shear could play a significant role on particle confinement as shown both by modeling and experiments performed in DIII-D. The role of E×B flow shear on particle transport and in particular on density peaking is analyzed by means of integrated modeling simulations performed with the CRONOS suite of codes.
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บรรณานุกรม

Wannapa Buangam และผู้แต่งคนอื่นๆ. (2019) Study of particle and impurity behaviors in H-mode tokamak plasma. Thammasat University:ม.ป.ท.
Wannapa Buangam และผู้แต่งคนอื่นๆ. 2019. Study of particle and impurity behaviors in H-mode tokamak plasma. ม.ป.ท.:Thammasat University;
Wannapa Buangam และผู้แต่งคนอื่นๆ. Study of particle and impurity behaviors in H-mode tokamak plasma. ม.ป.ท.:Thammasat University, 2019. Print.