Heating effect by energetic particles and transport properties of turbulence with zonal flows

2014 Fiscal Year Final Research Report

• Project/Area Number: 24740372
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plasma science
• Research Institution: Kyushu University
• Principal Investigator: SASAKI Makoto 九州大学, 応用力学研究所, 助教 (70575919)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 帯状流 / 測地線音波 / GAM / 高エネルギー粒子 / 乱流輸送 / ドリフト波

Outline of Final Research Achievements

Toward the improvement of understanding of plasma turbulent transport properties, we investigate the ``effect of energetic particles`` and ``competition among turbulent structures``. In the turbulent structures, there are zonal flows, which suppress the transport, and several structures which enhance the transport. First, we focus on energetic driven geodesic acoustic mode (GAM), which is an oscillatory branch of the zonal flows. The ion heating effect of the GAMs is discussed. By considering the nonlinear fluid effects, the saturated amplitude and the nonlinear propagation velocity of the GAMs are theoretically obtained. Second, the turbulent transport, which includes the nonlinear competition among several turbulent structures, is investigated by using turbulence simulation. A formation mechanism of the steep wave front by drift waves is theoretically understood. A selection rule of the several turbulent structures, and the change of the transport property are obtained.

Free Research Field

プラズマ物理学