DEVELOPMENT OF AN INTENSE NEGATIVE HYDROGEN ION SOURCE WITH AN EXTERNAL MAGNETIC FILTER
DEVELOPMENT OF AN INTENSE NEGATIVE HYDROGEN ION SOURCE WITH AN EXTERNAL MAGNETIC FILTER
复制标题
外置磁过滤器强负氢离子源的研制
DOI：
10.1063/1.1145655
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发表时间：
1995
影响因子：
1.6
通讯作者：
H. Kawakami
中科院分区：
文献类型：
--
作者：
Y. Takeiri;A. Ando;O. Kaneko;Y. Oka;K. Tsumori;R. Akiyama;E. Asano;T. Kawamoto;T. Kuroda;M. Tanaka;H. Kawakami
研制了一台强流负氢离子源，它由一对间距为35.4cm的永磁体排产生35 cm×62 cm宽范围的强外磁过滤场。中心的滤波器强度为70 G，线积分滤波器强度为850 G cm，这保持了提取区域中的低电子温度。在腔体表面产生1.8 kG的强尖形磁场，以改善等离子体约束。这导致在低工作气压下的高电弧效率。16.2在铯模式操作中，在3.8 mTorr的气体压力下，在0.1 A/kW的电弧效率下获得了能量为47 keV的H−离子电流A。提取间隙中的磁场也很强，450 G，用于电子抑制。在3 mTorr的气压下，引出电流与负离子电流的比率小于2.2。对两级加速器进行了实验，获得了13.6A的H−离子束加速。
An intense negative hydrogen ion source has been developed, which has a strong external magnetic filter field in the wide area of 35 cm×62 cm produced by a pair of permanent magnet rows located at 35.4 cm separation. The filter strength is 70 G in the center and the line‐integrated filter strength is 850 G cm, which keeps the low electron temperature in the extraction region. Strong cusp magnetic field, 1.8 kG on the chamber surface, is generated for improvement of the plasma confinement. These resulted in the high arc efficiency at the low operational gas pressure. 16.2 A of H− ion current with the energy of 47 keV was obtained at the arc efficiency of 0.1 A/kW at the gas pressure of 3.8 mTorr in the cesium‐mode operation. The magnetic field in the extraction gap is also strong, 450 G, for the electron suppression. The ratio of the extraction current to the negative ion current was less than 2.2 at the gas pressure of 3 mTorr. The two‐stage acceleration was tested, and 13.6 A of H− ion beam was accelerat...