Edge Plasma behavior during Improved Confinement by Lower Hybrid Wave Heating in HT-6M Tokamak

Comparisons of the Plasma Performance of Future Thailand Tokamak using Various External Heating Schemes

“…Additionally, it is found that both temperature profiles at the edge of the plasma can form a transport barrier in case of ICRH equals to 0.2 -0.5 MW, signifying by steep raising of the temperature profiles. This transition agree with HT-6 M experiments [1].…”

“…This trend is similar to the predictions using BAL-DUR code made by J. Promping et al, though the temperatures are different because of the difference in electron densities and temperature boundary conditions used [6]. This simulation result is also close to the experimental set-up in Li Jian-gang et al, (T i = 200 eV, T e = 500 eV when B φ = 1 T and I P = 60 ∼ 100 kA) [1]. As the tokamak is intrinsically a pulsed machine because it is relying so much on inductive current.…”

“…The toroidal magnetic field is assumed to be 1.5 T on its axis. The heating power of range 0.1 -0.5 MW is used as it was shown in the experiment of HT-6 M that L-H transition could be achieved [1]. Ion and electron temperatures profiles with the ICRH power varied is shown in Fig.…”

“…This tokamak is planned to be installed at Thailand Institute of Nuclear Technology (TINT), under the collaborative work of the Center for Plasma and Nuclear Fusion Technology (CPaF). It is a small tokamak with major radius R = 0.65 m and minor radius a = 0.20 m [1]. Originally, tokamak operation was designed for studying the auxiliary heating (NBI, ICRH, ECRH and LH) and the transport of the impurity.…”

“…In this work, a combination of a mixed Bohm/gyro-Bohm anomalous transport model [7] and an NCLASS neoclassical transport model [8] are used to calculate plasma core diffusivities [9]. In past experiments in HT-6 M, it was found that H-mode were obtained by Lower hybrid external heating [1]. Therefore, the edge area is described by a pedestal model based on international scaling [10], which was not taken into account in the previous BALDUR simulations [6].…”