Micro-Faraday cup matrix detector for ion beam measurements in fusion plasmas.
Micro-Faraday cup matrix detector for ion beam measurements in fusion plasmas.
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DOI：
10.1063/1.5084219
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发表时间：
2019-03
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通讯作者：
D'aniel Imre R'efy;S. Zoletnik;D. Dunai;G. Anda;M. Lampert;S'andor HegedHus;Domonkos Nagy;Mikl'os Pal'ankai;JenHo K'adi;Bal'azs Lesk'o;P. Háček;V. Weinzettl
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作者：
D'aniel Imre R'efy;S. Zoletnik;D. Dunai;G. Anda;M. Lampert;S'andor HegedHus;Domonkos Nagy;Mikl'os Pal'ankai;JenHo K'adi;Bal'azs Lesk'o;P. Háček;V. Weinzettl
原子束探针是常规束发射光谱诊断在磁约束等离子体边缘电流波动测量中的扩展。被等离子体电离的束原子被磁场引导到弯曲的轨迹上，并且可以在靠近装置壁的地方被检测到。离子的到达位置和电流分布携带有关等离子体电流分布、密度分布和等离子体边缘电位的信息。本文介绍了一种用于测量等离子体边缘附近几微安离子电流分布的微型法拉第杯矩阵探测器。该装置采用印刷电路板技术生产的浅法拉第杯矩阵。等离子体辐射和离子轰击产生的二次电子基本上被托卡马克磁场限制在杯状结构中。此外，双掩膜安装在正面，以限制离子流入杯和补充二次电子抑制。该装置在实验室中使用锂离子束进行了详细测试。在实验室设置中的开关时间、串扰和波动灵敏度测试结果与将安装在COMPASS托卡马克上的探测器设置一起给出。
Atomic beam probe is an extension of the routinely used beam emission spectroscopy diagnostic for the plasma edge current fluctuation measurement at magnetically confined plasmas. Beam atoms ionized by the plasma are directed to a curved trajectory by the magnetic field and may be detected close to the wall of the device. The arrival location and current distribution of the ions carry information about the plasma current distribution, the density profile, and the electric potential in the plasma edge. This paper describes a micro-Faraday cup matrix detector for the measurement of the few microampere ion current distribution close to the plasma edge. The device implements a shallow Faraday cup matrix, produced by printed-circuit board technology. Secondary electrons induced by the plasma radiation and the ion bombardment are basically confined into the cups by the tokamak magnetic field. Additionally, a double mask is installed in the front face to limit the ion influx into the cups and supplement secondary electron suppression. The setup was tested in detail using a lithium ion beam in the laboratory. Switching time, cross talk, and fluctuation sensitivity test results in the lab setup are presented along with the detector setup to be installed at the COMPASS tokamak.