Study of nonlinear mechanism of tokamak disruptions during runaway electron generation and avalanche

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820404
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: National Institutes for Quantum and Radiological Science and Technology (2016); Japan Atomic Energy Agency (2014-2015)
• Principal Investigator: Matsuyama Akinobu 国立研究開発法人量子科学技術研究開発機構, 六ヶ所核融合研究所 核融合炉システム研究開発部, 主任研究員(定常) (90581075)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: トカマク / ITER / MHD / ディスラプション / 逃走電子 / 不純物 / VDE

Outline of Final Research Achievements

A novel simulation code that enables us to analyze the interaction of the runaway electron generation and avalanches with dynamic changes of the confining magnetic fields due to MHD instabilities has been developed. Using the developed simulation code, it has been shown that (1) the perturbed electric field associated with the MHD instability causes the burst generation of runaway electron generation because of the exponential sensitivity of the primary generation to the electric field; (2) the MHD instability causes the flattening of beam current profile, which results in the increase of the net runaway electron generation through the modification to internal inductance of beam plasmas. Additionally, the runaway beam equilibrium code, the VDE code, the impurity code, and the orbit following code have been developed. These individual codes build up a basis for performing the integrated simulation studies for rapid shutdown scenarios of ITER as the next step of the research.

Free Research Field

核融合理論・シミュレーション