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首页> 外文期刊>Nuclear fusion >Studies on impact of electron cyclotron wave injection on the internal transport barriers in JT-60U weak shear plasmas
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Studies on impact of electron cyclotron wave injection on the internal transport barriers in JT-60U weak shear plasmas

机译：电子回旋波注入对JT-60U弱剪切等离子体内部输运势垒的影响研究

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摘要

Impact of the electron cyclotron range of frequency wave (ECRF) on the internal transport barriers (ITBs) in a weak shear (WS) plasma has been investigated in JT-60U. The fundamental O-mode ECRF of 110 GHz injected obliquely (co-current drive) from the low field side is used. It is observed that the ion temperature (T_i) ITB in a WS plasma can be degraded by ECRF. It is clarified for the first time that the degradation depends increasingly on the EC power (Pec) but decreasingly on the plasma current (I_p). Moreover it is confirmed that ECRF affects the toroidal rotation (V_t) indirectly and results in the flattening of V_t(ρ) and therefore the radial electric field (E_r) profiles regardless of the direction of the target V_t(ρ), peaking co or counter direction (relative to the I_p direction). Furthermore, it is recently found that T_i and V_t in the whole ITB region are affected with almost no delay from the EC onset even with off-axis EC deposition. These results indicate that EC injection unveiled a semi-global structure that characterizes T_i ITB in a WS plasma.
机译：在JT-60U中已经研究了电子回旋加速器的频率波范围（ECRF）对弱剪切（WS）等离子体中的内部传输壁垒（ITB）的影响。从低场侧倾斜注入（并流驱动）110 GHz的基本O模式ECRF。观察到，WSRF中的离子温度（T_i）ITB可以通过ECRF降低。首次澄清，劣化程度越来越取决于EC功率（Pec），而越来越取决于等离子体电流（I_p）。此外，已确认ECRF间接影响环形旋转（V_t），并导致V_t（ρ）趋于平坦，因此径向电场（E_r）轮廓与目标V_t（ρ）的方向，峰值co或反向无关方向（相对于I_p方向）。此外，最近发现，即使离轴EC沉积，整个ITB区域中的T_i和V_t几乎不受EC发作延迟的影响。这些结果表明，EC注入揭示了一种半球形结构，该结构表征了WS等离子体中的T_i ITB。

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