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(EX5/3) High-Radiation and High-Density Experiments in JT-60U

H. Kubo¹⁾, S. Sakurai¹⁾, N. Asakura¹⁾, S. Konoshima¹⁾, H. Tamai¹⁾, S. Higashijima¹⁾, A. Sakasai¹⁾, H. Takenaga¹⁾, K. Itami¹⁾, K. Shimizu¹⁾, T. Fujita¹⁾, Y. Kamada¹⁾, Y. Koide¹⁾, H. Shirai¹⁾, T. Sugie¹⁾, T. Nakano¹⁾, N. Oyama¹⁾, H. Urano²⁾, T. Ishijima³⁾, K. Hill⁴⁾, D. R. Ernst⁴⁾, A. W. Leonard⁵⁾, the JT-60U Team^1)
 
1) Japan Atomic Energy Research Institute, Naka-gun, Japan
²⁾ Hokkaido University, Sapporo, Japan
³⁾ Nagoya University, Nagoya, Japan
⁴⁾ Princeton Plasma Physics Laboratory, Princeton, USA
⁵⁾ General Atomics, San Diego, USA

Abstract.  In order to obtain confinement improved plasmas with high radiation at high density, Ar gas was injected into ELMy H-mode plasmas in JT-60U. A confinement improvement of HH_{98(y, 2)} $\sim$ 1 was obtained with a high radiation loss power fraction ($\sim$ 80 %) at an electron density of $\sim$ 0.65n_GW. The HH-factor was about 50% higher than that in plasmas without Ar injection.

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