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Spatially resolved measurements of RF accelerated deuterons at JET

机译：在射流下的RF加速氘核的空间解决测量

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摘要

An understanding of fast (supra-thermal) ion behavior is of great importance in tokamak physics and is a subject studied from both theoretical and experimental perspectives. This paper investigates the spatial energy and density distributions of RF accelerated deuterons using the neutron camera at the tokamak JET. Using the 19 liquid scintillator detectors available in the neutron camera system, we obtain spatial information that cannot be accessed with a single sightline. We present a spectroscopic analysis method in which a spatially resolved model of the fast ion distribution is fitted to the pulse height spectra from all 19 detectors simultaneously. The fast ion distribution is parameterized in such a way that the density, energy, and pitch-angle parts are uncoupled. The energy part is composed of a Maxwellian distribution, characterized by an 'RF tail temperature,' and the spatial dependence is modeled as a two-dimensional Gaussian distribution on the poloidal plane of the tokamak. From this parameterized model, we can calculate the spectrum of fusion born neutrons originating from reactions involving RF accelerated deuterons, and by fitting this model to the measured neutron camera pulse height spectra, we obtain an estimate of the spatially resolved distribution of the fast deuterons. The method has been applied to three JET pulses using different RF heating schemes and is shown to identify several features of the fast ion distribution produced in the various scenarios. Hence, this method is able to provide quantitative information about the fast ion distribution resulting from different heating schemes, and can also be useful, e.g., to validate simulation results from RF modeling codes.
机译：对快速（超热）离子行为的理解在托卡马克物理学中具有重要意义，并且是从理论和实验视角研究的主题。本文研究了RF加速氘核在Tokamak Jet的中子摄像机的空间能量和密度分布。使用中子摄像机系统中可用的19个液体闪烁体探测器，我们获得无法使用单个视线访问的空间信息。我们介绍了一种光谱分析方法，其中快速离子分布的空间分辨模型与所有19个探测器同时安装在脉冲高度光谱上。快速离子分布以这样的方式参数化，使得密度，能量和俯仰角部件是未耦合的。能量部分由最大位居分布组成，其特征在于“射频尾部温度”，并且空间依赖性被建模为托卡马克的面色平面上的二维高斯分布。从该参数化模型中，我们可以计算源自涉及RF加速氘核的反应的融合出生中子的频谱，并且通过将该模型拟合到测量的中子摄像机脉冲高度光谱，我们获得了快速氘核的空间分辨分布的估计。该方法已经应用于使用不同的RF加热方案的三个喷射脉冲，并且被示出以识别在各种场景中产生的快速离子分布的若干特征。因此，该方法能够提供关于由不同加热方案产生的快速离子分布的定量信息，并且也可以是有用的，例如，用于验证来自RF建模代码的仿真结果。

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  • 来源
    《Nuclear fusion》 |2021年第3期|036025.1-036025.17|共17页
  • 作者

    A. Sahlberg; J. Eriksson; S. Conroy; G. Ericsson; M. Nocente; Ye.O. Kazakov;

  • 作者单位

    Department of Physics and astronomy Uppsala University Sweden;

    Department of Physics and astronomy Uppsala University Sweden;

    Department of Physics and astronomy Uppsala University Sweden;

    Department of Physics and astronomy Uppsala University Sweden;

    Dipartimento di Fisica Universita di Milano-Bicocca Milan Italy;

    Laboratory for Plasma Physics LPP-ERM/KMS Brussels Belgium;

  • 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

    neutron spectroscopy; fast ions; tokamak; ICRF; JET; plasma diagnostics; nuclear fusion;

    机译：中子光谱;快速离子;Tokamak;ICRF;喷射;等离子体诊断;核聚变;

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