Characterisation of a BC501A compact neutron spectrometer for fusion research.
Characterisation of a BC501A compact neutron spectrometer for fusion research.
复制标题
用于聚变研究的 BC501A 紧凑型中子能谱仪的表征。
DOI：
10.1063/1.4964375
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发表时间：
2016
影响因子：
1.6
通讯作者：
A. Zimbal
中科院分区：
文献类型：
--
作者：
G. Tardini;F. Gagnon;A. Zimbal
对ASDEX升级托卡马克装置使用的紧凑型中子谱仪进行了表征，以获得其响应矩阵。本文描述了基于PTB离子加速器设施(PIAF)的一次运动和随后对来自具有广泛能量分布的场的中子的飞行时间(TOF)分析的表征过程和所导出的响应矩阵。用PIAF产生的单能中子的响应作为TOF分析的参考。利用最大熵变换对模拟响应进行高斯展宽以拟合实验结果，得到探测器对光谱去卷积的响应函数。通过这种方式，响应函数足够平滑，以确保脉冲高度谱可靠地展开为中子发射谱，从而提供关于中性束加热托卡马克等离子体中快离子速度分布的信息。
The compact neutron spectrometer used at the ASDEX Upgrade tokamak is characterised to obtain its response matrix. This paper describes the characterisation procedure and the derived response matrix, based on a campaign at the PTB ion accelerator facility (PIAF) and on the subsequent time-of-flight (TOF) analysis of neutrons from a field with a broad energy distribution. The response of mono-energetic neutrons generated at the PIAF is used as reference for the TOF analysis. The detector's response functions for spectrum deconvolution are obtained by Gaussian broadening of the simulated responses to fit the experimental ones, using a maximum-entropy ansatz. In this way, the response functions are smooth enough to ensure a reliable unfolding of pulse height spectra into neutron emission spectra, which provide information on the fast ion velocity distribution in neutral beam heated tokamak plasmas.