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R&D progress of the high power negative ion accelerator for the ITER NB system at JAEA

机译：JAEA ITER NB系统大功率负离子加速器的研发进展

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摘要

At JAEA, as the Japan Domestic Agency (JADA) for ITER, a MAMuG (multi-aperture multi-grid) accelerator has been developed to perform the required R&D for the ITER neutral beam (NB) system. As a result of countermeasures to handle excess heat load to the ion source by backstreaming positive ions, H- ion beam current was increased to 0.32 A (the ion current density of 140 A m~(-2)) at a beam energy of 796 keV. This high power beam acceleration simulated the ITER operation condition maintaining the perveance (H~- ion current density/beam energy~(3/2)) of the ITER accelerator. After the high power beam operation, the pulse length was successfully extended from 0.2 to 5 s at 550 keV, which yielded a 131 mA H- ion beam as an initial test of the long pulse operation. A test of a single-aperture single-gap (SINGAP) accelerator was performed at JAEA under an ITER R&D task agreement. The objective of this test was to compare two different accelerator concepts (SINGAP and MAMuG) at the same test facility. As a result, the MAMuG accelerator was defined as the baseline design for ITER, due to advantages in its better voltage holding and less electron acceleration. In three-dimensional beam trajectory analyses, the aperture offset at the bottom of the extractor was found to be effective for compensation of beamlet deflection due to their own space charge. It has been analytically demonstrated that these compensated beamlets can be focused at a focal point by adopting the aperture offset at the final grid of the accelerator.
机译：在JAEA，作为ITER的日本国内机构（JADA），已经开发了MAMuG（多孔径多网格）加速器来执行ITER中性束（NB）系统所需的研发。通过对正离子进行反向处理以应对过量热负荷的措施的结果是，在796的束能量下，H离子束电流增加到0.32 A（离子电流密度为140 A m〜（-2））。 keV。这种高功率光束加速度模拟了ITER的运行条件，保持了ITER加速器的灵敏度（H〜-离子电流密度/束能量〜（3/2））。高功率束操作后，在550 keV时脉冲长度成功地从0.2 s延长到5 s，这产生了131 mA H离子束，作为长脉冲操作的初始测试。根据ITER R＆D任务协议，在JAEA进行了单孔单间隙（SINGAP）加速器的测试。该测试的目的是在同一测试设备上比较两种不同的加速器概念（SINGAP和MAMuG）。因此，由于MAMuG加速器具有更好的电压保持能力和更少的电子加速能力，因此被定义为ITER的基线设计。在三维束轨迹分析中，发现提取器底部的孔径偏移可有效补偿由于其自身的空间电荷而引起的小束偏转。分析地证明，通过在加速器的最终栅格处采用孔径偏移，可以将这些补偿后的子束聚焦在焦点上。

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  • 来源
    《Nuclear fusion》 |2009年第6期|12.1-12.7|共7页
  • 作者

    M. Kashiwagi; M. Taniguchi; M. Dairaku; H.P.L. de Esch; L.R. Grisham; L. Svensson; H. Tobari; N. Umeda; K. Watanabe; K. Sakamoto; T. Inoue;

  • 作者单位

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

    CEA Cadarache, F-13108, St Paul-lez-Durance, CEDEX, France;

    Plasma Physics Laboratory, Princeton University, PO Box 451, Princeton, NJ 08543, USA;

    CEA Cadarache, F-13108, St Paul-lez-Durance, CEDEX, France;

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka 311-0193, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    negative-ion beams; beam focusing and bending magnets; wiggler magnets; and quadrupoles;

    机译：负离子束光束聚焦和弯曲磁铁;摇摆磁铁和四极;

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