A method of particle transport study using supersonic molecular beam injection and microwave reflectometry on HL-2A tokamak.
A method of particle transport study using supersonic molecular beam injection and microwave reflectometry on HL-2A tokamak.
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DOI：
10.1063/1.3274201
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发表时间：
2010-01
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影响因子：
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通讯作者：
W. Xiao;X. Zou;X. Ding;J. Dong;L. Yao;S. Song;Z. T. Liu;Y. Gao;B. Feng;X. Song;Q. Yang;L. Yan;Yi Liu;X. Duan;C. Pan;Y. Liu
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文献类型：
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作者：
W. Xiao;X. Zou;X. Ding;J. Dong;L. Yao;S. Song;Z. T. Liu;Y. Gao;B. Feng;X. Song;Q. Yang;L. Yan;Yi Liu;X. Duan;C. Pan;Y. Liu
本文报道了一种利用超声速分子束注入（SMBI）和微波反射法研究粒子输运的方法。实验结果证实，脉冲SMBI是一种较好的微扰源，具有较深的穿透性和较好的局域性。用脉冲SMBI诱导局部密度调制，用微波反射仪测量微扰密度。利用傅里叶变换对局部密度扰动进行分析，可以得到密度调制的幅值和相位的径向分布。HL-2A的实验结果表明，SMBI注入的颗粒位于r/a=0.65 ~ 0.75左右。主粒子源的位置可通过三个方面确定：微波反射法测得的调制密度的傅里叶变换的一次谐波相位最小值；H(a)强度分布图和局部密度增加比。第一次谐波振幅最大值相对于粒子源位置经常向内移动，这清楚地表明在该区域存在向内的粒子掐位。实验结果与解析输运模型的模拟结果吻合较好。通过模拟得到了粒子扩散率D和粒子对流速度V。讨论了密度调制的幅值和相位输运系数的灵敏度。
A method of the particle transport study using supersonic molecular beam injection (SMBI) and microwave reflectometry is reported in this paper. Experimental results confirm that pulsed SMBI is a good perturbation source with deeper penetration and better localization than the standard gas puffing. The local density modulation is induced using the pulsed SMBI and the perturbation density is measured by the microwave reflectometry. Using Fourier transform analysis for the local density perturbation, radial profiles of the amplitude and phase of the density modulation can be obtained. The experimental results in HL-2A show that the particle injected by SMBI is located at about r/a=0.65-0.75. The position of the main particle source can be determined through three aspects: the minimum of the phase of the first harmonic of the Fourier transform of the modulated density measured by microwave reflectometry; the H(a) intensity profile and the local density increase ratio. The maximum of the amplitude of the first harmonic shifts often inward relative to the particle source location, which indicates clearly there is an inward particle pinch in this area. Good agreement has been found between the experimental results and the simulation using analytical transport model. The particle diffusivity D and the particle convection velocity V have been obtained by doing this simulation. The sensitivity in the transport coefficients of the amplitude and the phase of the density modulation has been discussed.