Sustainment of high confinement in JT-60U reversed shear plasmas
Sustainment of high confinement in JT-60U reversed shear plasmas
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DOI：
10.1088/0029-5515/42/2/309
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发表时间：
2002-02
期刊：
影响因子：
3.3
通讯作者：
T. Fujita;Y. Kamada;S. Ide;S. Takeji;Y. Sakamoto;A. Isayama;T. Suzuki;T. Oikawa;T. Fukuda;Jt U Team
中科院分区：
文献类型：
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作者：
T. Fujita;Y. Kamada;S. Ide;S. Takeji;Y. Sakamoto;A. Isayama;T. Suzuki;T. Oikawa;T. Fukuda;Jt U Team
本文报道了JT-60U反向剪切（RS）等离子体长期维持的实验结果，其中由于强内部传输屏障而实现了高约束。在具有L模式边缘的大电流等离子体中，通过对储存能量的反馈控制精确调节等离子体β，使氘-氚当量聚变功率增益QDTeq = 0.5持续0.8 s（≈能量约束时间）。在具有ELMy H模式边缘的高三角形等离子体中，在高q区（q95≈9）获得了高自引导电流分数（≈80%），从而实现了完全的无感电流驱动条件。归一化β βN≈2和H因子H89≈3.5 （HH98y2≈2.2）持续2.7 s（约6倍能量约束时间）。在高自举电流分数和高三角度条件下，RS等离子体中βN和H89的维持值显著提高。
Experimental results towards long sustainment of JT-60U reversed shear (RS) plasmas, where high confinement is achieved owing to strong internal transport barriers, are reported. In a high current plasma with an L mode edge, a deuterium-tritium-equivalent fusion power gain QDTeq = 0.5 was sustained for 0.8 s (≈the energy confinement time) by precise adjustment of the plasma beta using feedback control of stored energy. In a high triangularity plasma with an ELMy H mode edge, a high bootstrap current fraction (≈80%) was obtained in a high q regime (q95≈9), which led to the full non-inductive current drive condition. A normalized beta βN ≈2 and an H factor H89≈3.5 (HH98y2≈2.2) were sustained for 2.7 s (about 6 times the energy confinement time). The values of βN and H89 sustained in RS plasmas were improved remarkably by operating with high bootstrap current fraction and high triangularity.