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首页> 外文期刊>Fusion Engineering and Design >Benchmark of beam acceleration codes on a high voltage negative ion accelerator for fusion with a new hypothesis on the beam meniscus
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Benchmark of beam acceleration codes on a high voltage negative ion accelerator for fusion with a new hypothesis on the beam meniscus

机译：在高压负离子加速器上融合的梁加速码的基准，融合梁弯月面上的新假设

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摘要

It is a widely recognized phenomenon that, in negative ion sources for NBI, the magnetic fields in the source cause an asymmetry of the current density at the meniscus, which affects the beam optics. In order to achieve a more realistic estimation of the negative ion beam optics, the ion current density profile at the beamlet meniscus is sometimes assumed to be non-symmetric with respect to the beamlet axis. The new hypothesis tested in this paper is an empirical law obtained by recent investigations on a similar Kamaboko ion source, which relates this asymmetry to the magnetic field strength at the meniscus and to the power injected in the ion source. For the first time this hypothesis is used to directly and correctly predict the value of the beamlet deflection.The MeV ion source Test Facility (MTF) is a high voltage negative ion beam accelerator dedicated to fusion experiments in QST, Naka, Ibaraki, Japan. MTF can be operated as a three- or five-stage multi-aperture accelerator with a configuration and beam energy comparable to the future ITER NBI. In 2019, experiments were conducted on MTF aiming at accelerating a H- beam with high energy and good optics for a long duration of the beam (around 100 s). These experiments allowed to measure the beamlet divergence and deflection as well as the heat loads due to particle impinging on the accelerator grids, over a wide range of operating parameters. The predictions of several beam simulation codes (Opera, COMSOL, SLACCAD, EAMCC3D) have been compared to the experimental measurements, which allows to obtain a good agreement in terms of beam optics and a fair agreement in terms of heat loads.
机译：它是一种广泛认可的现象，即在NBI的负离子源中，源中的磁场导致弯芯的电流密度的不对称性，影响光束光学器件。为了实现负离子束光学器件的更真实估计，有时假设束弯液面处的离子电流密度曲线相对于束轴是非对称的。本文测试的新假设是通过最近对类似Kamaboko离子源的研究获得的实证法，这将这种不对称与弯月面的磁场强度相关，并在离子源中注入的电源。首次使用该假设来直接和正确地预测光束偏转的值。MEV离子源测试设施（MTF）是专用于QST，Naka，Ibaraki，Japan的融合实验的高压负离子束加速器。 MTF可以作为三级或五级多孔加速器操作，具有与未来ITER NBI相当的配置和光束能量。 2019年，在MTF上进行实验，旨在加速具有高能和良好光学元件的H-梁，以便长时间的梁（约100秒）。在广泛的操作参数上，允许这些实验来测量光束发散和偏转以及由于施加在加速器网格上的颗粒而导致的热载。已经将多个光束仿真码（OPERA，COMSOL，SLACCAD，SEAMCC3D）的预测与实验测量进行了比较，这允许在光束光学和热负荷方面获得良好的协议。

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  • 来源
    《Fusion Engineering and Design》 |2021年第7期|112374.1-112374.8|共8页
  • 作者

    Denizeau S.; Aprile D.; Agostinetti P.; Veronese F.; Patton T.; Pimazzoni A.; Hiratsuka J.; Ichikawa M.; Saquilayan G. M.; Kojima A.; Kashiwagi M.; Chitarin G.;

  • 作者单位

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy;

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy|INFN Lab Nazl Legnaro Padua Italy;

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy;

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy;

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy;

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy;

    Natl Inst Quantum & Radiol Sci & Technol QST Naka Ibaraki Japan;

    Natl Inst Quantum & Radiol Sci & Technol QST Naka Ibaraki Japan;

    Natl Inst Quantum & Radiol Sci & Technol QST Naka Ibaraki Japan;

    Natl Inst Quantum & Radiol Sci & Technol QST Naka Ibaraki Japan;

    Natl Inst Quantum & Radiol Sci & Technol QST Naka Ibaraki Japan;

    Univ Padua Acciaierie Venete SpA Consorzio RFX CNR ENEA INFN Padua Italy|Univ Padua Dept Management & Engn DTG Vicenza Italy;

  • 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

    Neutral beam injector; Negative ion accelerator; Heat loads; Beam optics;

    机译：中性光束注射器;负离子加速器;热负荷;梁光学;

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