Objectives of the Meeting

The goal of the Asia-Pacific Transport Working Group (APTWG) is a predictive understanding of the basic mechanism responsible for particle, momentum, and heat transports in magnetically confined plasmas that have strong non-linearity, non-diffusivity, and non-locality.
The research for the characteristics of the turbulence and MHD activity is essential to understand the formation and termination of both internal and edge transport barrier in the magnetically confined plasma. It is essential to characterize the competition between turbulences and interaction between turbulence and MHD activity in space and time domain. The effect of magnetic topology on turbulence and MHD activity, which have been recognized to be an important in toroidal plasmas, are also emphasized in this meeting.

* The conference is held under the auspices of School of Science, Nagoya University

Working Group of this meeting

 In order to realize the objectives, four topical foci have been identified for the working groups in this year:

(A) Turbulence and Blob at the boundary of magnetic topology (Edge and SOL)
This working group discusses the turbulence and Blob at the boundary of magnetic topology. For example, turbulences in the plasma edge, where the magnetic flux surface is closed, and in SOL where the magnetic is open, and their interaction would be a main topic in this working group. The characteristics of turbulence and impact to the transport are different in Edge and SOL. The other example of the boundary of magnetic topology is the boundary of magnetic island where, the turbulence penetrate into the magnetic island, where the turbulence level is low. The transport barrier physics at the plasma edge and vicinity magnetic island at rational surface is included in this working group.

WG leader : D.F. Kong (ASIPP), M. Kobayashi (NIFS)

(B) Model reduction and experiments for validation
This working group discusses the model reduction and its validation of structure formation of turbulence such as turbulence spreading, staircase, avalanche, and MHD activities driven by energetic particle. One of the important issue in this working group is to discuss how to test the model with experimental results beyond the usual comparison of transport coefficient such as thermal diffusivity. The model for the transport barrier and experiment which can be used for the validation of model are included in this working group.

WG leader : T. Fujita (Nagoya Univ.), Y.C. Ghim (KAIST)

(C) Mode competition in turbulence and MHD driven by energetic particle
This working group discusses the mode competition of turbulence and coupling between turbulence and zonal flow and mode coupling to the MHD. We need expansion of the research field after the finding the turbulence suppression by zonal flow. This working group also covers the coupling to MHD mode driven by energetic particle.The effect of competition of turbulence on transport barrier is included in this working group.

WG leader : Y. Kosuga (RIAM Kyushu Univ.) and Dr. Liming Yu (SWIP)

(D) Mechanism determining plasma flows and their impact on transport and MHD
It is well known that the poloidal and toroidal flow are not determined independently. However, poloidal and toroidal flow are discussed have been discussed separately. It is important to understand the plasma flow in 3D geometry even in the axisymmetric system, because the both poloidal and toroidal flow would affect the transport barrier and MHD especially plasma edge.

WG leader: Won Ha Ko (NFRI) and D. Yu (SWIP)

Young research forum

Forum leader : S. Maeyama (Nagoya Univ.), T. Zhang (ASIPP), and Minjun J. Choi (NFRI)