Compact solid-state neutral particle analyzer in current mode.
Compact solid-state neutral particle analyzer in current mode.
复制标题
电流模式下的紧凑型固态中性粒子分析仪。
DOI：
10.1063/1.4732070
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Roquemore
中科院分区：
文献类型：
--
作者：
Y. Zhu;A. Bortolon;W. Heidbrink;S. L. Celle;A. Roquemore
固体中性粒子分析仪（ssNPA）阵列在DIII-D托卡马克和国家球面环面实验（NSTX）上以电流模式工作。与传统的脉冲计数npa相比，电流模式工作牺牲了能量分辨率，以获得经济、高带宽、俯仰角分辨率的测量。随着DIII-D上新的三通道近垂直视图电流模式ssNPA的成功，NSTX上现有阵列的孔径被扩大，以增加颗粒流入。两个阵列的视线相交加热光束，使主动和被动电荷交换测量。在两种设备上，波束相交处的空间分辨率通常为5厘米。在探测器表面直接沉积的超薄薄膜不仅可以阻挡1 keV以下的杂散光子，还可以设置25 keV左右的低能量阈值，用于探测氘粒子。高频磁流体动力学（MHD）不稳定性在中性磁通中产生的振荡很容易被检测到。
Solid state neutral particle analyzer (ssNPA) arrays are operated in current mode on the DIII-D tokamak and the National Spherical Torus Experiment (NSTX). Compared with conventional pulse-counting NPAs, current-mode operation sacrifices energy resolution to obtain economical, high-bandwidth, pitch-angle resolved measurements. With the success from a new three-channel near-vertical-view current mode ssNPA on DIII-D, the apertures on an existing array on NSTX were expanded to increase the particle influx. The sightlines of both arrays intersect heating beams, enabling both active and passive charge exchange measurements. The spatial resolution at beam intersection is typically 5 cm on both devices. Directly deposited ultra-thin foils on the detector surface block stray photons below the energy of 1 keV and also set low energy threshold about 25 keV for deuterium particle detection. Oscillations in neutral flux produced by high frequency magnetohydrodynamics (MHD) instabilities are readily detected.