Development of MeV Range Heavy Ion Beam Probe

MeV范围重离子束探头的研制

• 批准号: 03044155
• 负责人: HAMADA Yasuji
• 金额: $ 3.2万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044155/
• 关键词: Heavy Ion Beam Probe; Large Helical Divice; Heavy Ion Accelerator; Energy Analyzer; Plasma Diagnostics; Plasma Potential; Electrostatic Fluctuation; Magnetic Fluctuation; 重イオンビ-ムプロ-ブ; エネルギ-分析器; ヘリカル系磁場閉じ込め装置; 三次元ビ-ムプロ-ブ; CHS装置; LHD装置; ビ-ム掃引

The purpose of this collaboration program is to establish foundations for the design of 6 MeV heavy ion beam probe to be installed on the Large Helical Device (LHD). The critical issues are summarized in the following three items.(1) Design of 6 MeV accelerator with low ripple(2) Design of control system for three dimensional beam trajectory(3) Design of energy analyzer with high resolution of DE/E < 10^<-5> We summarize below the results of the collaboration program.1. On Heavy Ion Beam AcceleratorA thermionic ion source and single ended accelerator has been used in the conventional heavy ion beam probe, but it should be too large for the LHD experimental hall. We have decided to utilize a negative ion source and tandem accelerator. It is based on the facts that development of a negative gold ion source with energy spread less than 10 eV is within range and that high voltages with ripple less than 10^<-5> can be achieved by a RF derived power supply as is used in JIPPT-IIU HIBP.2. On Beam trajectory controlBeam trajectories are completely three dimensional and data accuracy for two dimensional potential profile measurement can be degraded. We have designed a new arrangement of the beam line in which second sweep electrodes are placed on the analyzer side to control the secondary beam trajectory so that the energy analyzer can be placed away from the torus, which will be tested with CHS HIBP. This will require sophisticated computer-controlled system.3. An Energy AnalyzerWe have constructed a new type of parallel plate analyzer with shaped electrode without guard ring, which is free from electric field disturbance in the analyzer, and successfully tested with JIPPT-IIU HIBZP. Furthermore, a new method of error elimination for the potential profile measurements has been developed. However, This type of analyzer is not a realistic for 6 MeV HIBP for LHD. New idea is necessary to be introduced.

该合作计划的目的是为将安装在大型螺旋装置（LHD）上的6 MeV重离子束探针的设计奠定基础。关键问题归纳为以下三项。(1)6 MeV低涟漪加速器的设计（2）束流三维轨迹控制系统的设计（3）高分辨率能量分析器的设计（DE/E &lt; 10^<-5>）我们总结了以下合作项目的结果。传统的重离子束探测器采用单端加速器和双离子源，但对于LHD实验大厅来说，它的体积太大。我们决定使用负离子源和串列加速器。其基于以下事实：能量扩散小于10 eV的负金离子源的开发在范围内，并且涟漪小于10 eV的高电压<-5>可以通过JIPPT-IIU HIBP. 2中使用的RF衍生电源来实现。束流轨迹控制束流轨迹是完全三维的，二维势分布测量的数据精度可能会降低。我们设计了一种新的束线布置，其中第二扫描电极放置在分析仪侧以控制二次束轨迹，使得能量分析仪可以远离环面放置，这将用CHS HIBP进行测试。这将需要复杂的计算机控制系统。我们研制了一种新型的无保护环异形电极平行板能量分析器，该分析器内部不受电场干扰，并成功地用JIPPT-IIUHIBZP进行了测试。此外，还提出了一种消除电位剖面测量误差的新方法。然而，这种类型的分析仪是不现实的6 MeV HIBP的LHD。有必要引进新的观念。

项目成果

A.TANIIKE,M.SASAO,A.FUJISAWA,H.IGUCHI,Y.HAMADA,J.FUJITA,M.WADA and Y.MORI: "A6MeV Tandem Acceleration System for Heavy Ion Beam Probe on LHD" In submission to IEEE Trans.Plasma Sci.

A.TANIIKE,M.SASAO,A.FUJISAWA,H.IGUCHI,Y.HAMADA,J.FUJITA,M.WADA 和 Y.MORI：“A6MeV Tandem Acceleration System for Heavy Ion Beam Probe on LHD” 提交给 IEEE Trans

M.SASAO: "A Charge Exchange Gas Cell for a High Quality Beam" Proc.Workshop on Negative Ion Formation and Beam Handling. KEK92-17. 163-168 (1993)

M.SASAO：“用于高质量光束的电荷交换气体电池”Proc.负离子形成和光束处理研讨会。

H.IGUCHI,H.TAKASUGI,T.SHOJI,J.FUJITA,H.IKEGAMI: "Simultanious Measurements of Plasma Potential and Density Fluctuations in a Bumpy Torus by a Heavy Neutral Beam Probe" To be published in Jap.J.Applied Physics. 32,Part1. (1993)

H.IGUCHI、H.TAKASUGI、T.SHOJI、J.FUJITA、H.IKEGAMI：“用重中性束探针同时测量凹凸圆环中的等离子体电势和密度波动” 即将发表在 Jap.J.Applied Chemistry 上

A. Fujisawa, H. iguchi, M. Sasao, Y. Hamada, J. Fujita: "Active Control of Beam Trajectries for Heavy Ion Beam Probe on Helical Megnetic Configurations" Rev. Sci. instrum.63(7). 3694-3700 (1992)

A. Fujisawa、H. iguchi、M. Sasao、Y. Hamada、J. Fujita：“螺旋磁力结构上重离子束探针的射束轨迹的主动控制”Rev. Sci。

Y. Hamada, Y. Kawasumi, K. Masai, H. Iguchi, A. Fujisawa and JIPPT-IIU Group, Y. Abe: "Shaped Electrode System for High Voltage Parallel Plate Analyzer" Rev. Sci. Instrim.63(10). 4446-4449 (1992)

Y. Hamada、Y. Kawasumi、K. Masai、H. Iguchi、A. Fujisawa 和 JIPPT-IIU Group、Y. Abe：“用于高压平行板分析仪的异型电极系统”Rev. Sci。