Measurement of the energy distribution of fast excited atoms by Doppler shift spectroscopy in an inertial-electrostatic confinement fusion device
Measurement of the energy distribution of fast excited atoms by Doppler shift spectroscopy in an inertial-electrostatic confinement fusion device
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惯性静电约束聚变装置中多普勒频移光谱测量快激发原子的能量分布
DOI：
10.1109/fusion.2002.1027730
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Nagafuchi
中科院分区：
文献类型：
--
作者：
K. Masuda;T. Mizutani;K. Yoshikawa;K. Nagasaki;K. Takiyama;H. Toku;H. Hashimoto;A. Nagafuchi
由加速离子与背景原子或分子之间的电荷交换反应产生的高能中性原子的能量分布，通过惯性静电约束聚变（IECF）装置中的多普勒频移光谱进行测量，该装置由作为阳极的球形真空室和同心放置在室中的球形空心阴极网格组成。由于辉光放电在阴极和阳极之间产生的离子在电场的作用下被加速向球形中心移动，并进入空心阴极，从而引起束流或束流背景碰撞聚变，因此这些离子的能量分布在很大程度上决定了聚变反应速率。在氢和氦 IEC 等离子体中测量了中心的光发射。然后在球对称的假设下，根据发射的展宽来评估径向方向的能量分布。结果，在氢和氦等离子体中，测得的最大离子能量约为阴极施加电压的 80%。在氢等离子体中，在快中性粒子的能谱中发现了三个能量峰，这表明在所施加电压的约 80% 能量处，H/sub 1//sup +/、H/sub 2//sup +/ 和 H/sub 3//sup +/ 离子的诞生地几乎相同。相比之下，在氦等离子体中，能量峰值要低得多，低至所施加电压的 20%。
Energy distributions of energetic neutral atoms resulted from charge-exchange reactions between accelerated ions and background atoms or molecules were measured by the Doppler shift spectroscopy in an inertial-electrostatic confinement fusion (IECF) device composed of a spherical vacuum chamber as an anode and a spherical hollow cathode grid concentrically placed in the chamber. Since ions generated between the cathode and the anode by a glow discharge are accelerated toward the spherical center by the electric field, and enter the hollow cathode to give rise to either beam-beam or beam-background colliding fusion, the energy distribution of such ions virtually determines the fusion reaction rate to great extent. The optical emissions from the center were measured in both hydrogen and helium IEC plasmas. The energy distributions in the radial direction were then evaluated from the broadening of the emissions, under an assumption of spherical symmetry. As a result, in both hydrogen and helium plasmas the maximum ion energies measured were found to be approximately 80% of the applied voltage to the cathode. In a hydrogen plasma, three energy peaks are found in the energy spectrum of fast neutrals, indicating almost the same birthplace of H/sub 1//sup +/, H/sub 2//sup +/, and H/sub 3//sup +/ ions at approximately 80% energy of the applied voltage. In contrast, in a helium plasma, the energy peak was found to be much less down to 20% of the applied voltage.