Study on the effect of hydrogen isotope on the formation of fusion plasma structure

2016 Fiscal Year Final Research Report

• Project/Area Number: 25420897
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institutes for Quantum and Radiological Science and Technology (2016); Japan Atomic Energy Agency (2013-2015)
• Principal Investigator: URANO HAJIME 国立研究開発法人量子科学技術研究開発機構, 那珂核融合研究所 先進プラズマ研究部, 上席研究員(定常) (70391258)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 炉心プラズマ / Hモード / 水素同位体 / シャフラノフシフト

Outline of Final Research Achievements

In the H-mode plasmas where the confinement is improved by the edge transport barrier in tokamak devices, the influence of hydrogen isotope mass on the plasma confinement has been investigated. The large-scale correlation between the edge and core plasmas has also been quantified. The increase of hydrogen isotope mass leads to the confinement improvement because the increase of the Shafranov shift due to the larger core pressure at heavier isotope stabilizes the edge plasmas. Then, the effects of Shafranov shift and plasma shape on the edge plasma structure have been assessed using JET and JT-60U. In particular, the increase of core pressure at high triangualrity and low elongation resulted in the reduction of edge pressure gradient due to the destabilization of the pressure-driven mode whereas the wider pedestal was formed so that the edge pressure was kept high enough.

Free Research Field

工学