Study of the physics of the extraction and optics of the negative ion beam in a negative ion source

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400533
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Plasma science
• Research Institution: Naruto University of Education
• Principal Investigator: KENJI MIYAMOTO 鳴門教育大学, 大学院学校教育研究科, 准教授 (00532996)
• Co-Investigator(Renkei-kenkyūsha): HATAYAMA Akiyoshi 慶応義塾大学, 理工学部, 教授 (10245607)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: プラズマ / 核融合 / 負イオン源 / 加速器 / シミュレーション / イオンビーム光学 / PIC法

Outline of Final Research Achievements

The physics of the extraction and optics of the negative ion beam, especially the beam halo formation was studied by using the 3D PIC (particle in cell) simulation combined with a Monte Carlo calculation.
It is shown that the beam halo consists of the negative ions extracted from the periphery of the plasma meniscus. Since the curvature of the equipotential surface is large in the periphery of the plasma meniscus, these negative ions are over-focused and then divergent.

Free Research Field

プラズマ理工学