利用Magic- $μ$技术进行磁场成像的第一个案例研究的模拟
Simulation of a first case study for magnetic field imaging with the Magic-$μ$ technique
摘要：
到目前为止，大多数的muography（或宇宙射线μ子射线照相术）的发展都是基于初级宇宙射线和地球大气核之间的核相互作用产生的宇宙射线μ子的散射或吸收。muography在各个学科中的应用越来越多。我们小组最近提出了一种新的使用这种技术来测量磁场的方法。这种新的应用利用了宇宙射线μ子的电荷，由于磁场产生的洛伦兹力，它们会改变轨道。在这项研究中，我们提出了一个可行性研究所提出的技术，通过模拟一个简单的偶极磁铁使用三维有限元解决方案包AMaze，连同PHITS蒙特卡罗模拟工具。在AMaze中计算磁体周围的磁场通量密度分布，并输入PHITS代码。正负宇宙射线μ子是基于PHITS分析辐射模型（PARMA）产生的。利用PHITS研究了磁场开启和关闭时两种位置灵敏闪烁体探测器上μ子计数率图的比较。模拟结果显示了磁体对计数率图的影响，并有望用于新提出的宇宙射线μ子的应用，磁场的成像。
英文摘要：
So far, most of the developments in muography (or cosmic-ray muon radiography) have been based on either the scattering or the absorption of cosmic-ray muons produced by the nuclear interactions between primary cosmic-rays and the nuclei of the Earth's atmosphere. Applications of muography are increasing in various disciplines. A new use of this technique to measure a magnetic field has recently been proposed by our group. This new application takes advantage of the electric charge of cosmic-ray muons, which causes them to change their trajectory due to the Lorentz force generated by a magnetic field. In this study, we present a feasibility study of the proposed technique by simulating a simple dipole magnet using the three-dimensional finite element solution package AMaze, together with the PHITS Monte Carlo simulation tools. The distribution of magnetic field flux densities around the magnet was calculated in AMaze and entered into the PHITS code. Positive and negative cosmic-ray muons were generated based on the PHITS-based analytical radiation model (PARMA). A comparison of the count rate maps of the detected muons on two position-sensitive scintillator detectors for the magnetic field ON and OFF was studied using PHITS. The simulation results show the effect of the magnet on the count rate maps and are promising for the newly proposed application of cosmic-ray muons, the imaging of a magnetic field.
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