Belchenko Yu, Ivanov A, Sanin A, Sotnikov O, Shikhovtsev I
Budker Institute of Nuclear Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia.
Rev Sci Instrum. 2016 Feb;87(2):02B119. doi: 10.1063/1.4932581.
Extraction of negative ions from the large inductively driven surface-plasma negative ion source was studied. The dependencies of the extracted currents vs plasma grid (PG) bias potential were measured for two modifications of radio-frequency driver with and without Faraday screen, for different hydrogen feeds and for different levels of cesium conditioning. The maximal PG current was independent of driver modification and it was lower in the case of inhibited cesium. The maximal extracted negative ion current depends on the potential difference between the near-PG plasma and the PG bias potentials, while the absolute value of plasma potential in the driver and in the PG area is less important for the negative ion production. The last conclusion confirms the main mechanism of negative ion production through the surface conversion of fast atoms.
研究了从大型电感驱动表面等离子体负离子源中提取负离子的过程。针对两种带有和不带有法拉第屏蔽的射频驱动器变体、不同的氢气进料以及不同水平的铯调节情况，测量了提取电流与等离子体栅极（PG）偏置电位的关系。最大的PG电流与驱动器变体无关，并且在铯受到抑制的情况下较低。最大提取负离子电流取决于近PG等离子体与PG偏置电位之间的电位差，而驱动器中和PG区域中等离子体电位的绝对值对负离子产生的影响较小。最后这一结论证实了通过快速原子的表面转换产生负离子的主要机制。
