Formation of ST Plasmas by ECH on LATE
Formation of ST Plasmas by ECH on LATE
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DOI：
10.1088/1009-0630/6/4/003
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发表时间：
2004-08
影响因子：
1.7
通讯作者：
M. Uchida;T. Maekawa;Hitoshi Tanaka;H. Igami;T. Yoshinaga;K. Katsuura;M. Konno
中科院分区：
文献类型：
--
作者：
M. Uchida;T. Maekawa;Hitoshi Tanaka;H. Igami;T. Yoshinaga;K. Katsuura;M. Konno
在LATE（Low Aspect ratio Torus Experiments）装置上进行了无中心OH螺线管的电子回旋加热（ECH）球形托卡马克（ST）等离子体形成实验。通过注入6.3 kW的2.45 GHz微波脉冲4秒，启动等离子体电流并斜升到Ip 1.3 kA，并最终通过调节外部垂直场维持1秒。磁测量表明，封闭的磁通表面形成，最后一个封闭的磁通表面的纵横比为A <$1.3和伸长率为κ <$1.3。用干涉仪测得的电子密度大于1.5 × 10 ~（11）cm ~（-3），超过了等离子体截止密度的两倍，表明模式转换电子伯恩斯坦波可能产生电子回旋加热。
Experiments on formation of spherical tokamak (ST) plasmas by electron cyclotron heating (ECH) alone without a central OH solenoid have been carried out on LATE (Low Aspect ratio Torus Experiments). By injecting a 2.45 GHz microwave pulse of 6.3 kW for 4 seconds, a plasma current is initiated and ramped up to Ip ≃ 3 kA, and finally maintained for 1 second by adjusting the external vertical field. Magnetic measurements show that closed flux surfaces are formed and the last closed flux surface has an aspect ratio of A ∼ 1.3 and an elongation of κ ∼ 1.3. The electron density measured by an interferometer is more than 1.5 × 1011 cm-3 which exceeds twice of the plasma cut-off density, suggesting that electron cyclotron heating by mode-converted electron Bernstein waves may take place.