Study of warm dense matter by using low-temperature and high-density detached recombining plasmas

2014 Fiscal Year Final Research Report

• Project/Area Number: 25610170
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Plasma science
• Research Institution: Nagoya University
• Principal Investigator: OHNO Noriyasu 名古屋大学, 工学(系)研究科(研究院), 教授 (60203890)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 非接触プラズマ / プラズマデタッチメント / Warm Dense Matter / プラズマ抵抗 / 体積再結合

Outline of Final Research Achievements

Low-temperature and high density detached recombining plasmas (DRP) with a lot of Rydberg atoms have been produced by using a divertor plasma simulator. Detailed measurement of dc plasma conductivity revealed the property of DRP as Warm Dense Matter (WDM).
New double probe theory was proposed by taking the effect of plasma resistivity into account. Based on the new double probe theory, the plasma resistivity was estimated to be 0.36Ωm in the DRP. This experimental value is four order magnitude larger that the calculated one based on electron-neutral collision, where the number of the Rydberg atoms calculated with collisional-radiative model is taken into account. The experimental value is one order magnitude larger than the Spitzer resistivity and the plasma resistivity induced by plasma turbulence. This result shows anomaly of the plasma resistivity in the DRP, and suggests that the DRP has the WDM characteristics.

Free Research Field

プラズマ・核融合工学