Understanding the physics of fast ions in a fusion plasma is widely considered as one of the crucial tasks for the reliable operation of fusion tokamak reactors. Measurements on tokamaks have shown that gamma rays are produced when fast ions react with either plasma fuel ions or with the plasma impurities such as beryllium, carbon and oxygen. The spectroscopy of these gamma rays can be used for measurement of fusion rates in plasma or behaviour and confinement of fusion reaction products, such as the alpha particles. To computationally support experiments a methodology has been developed for creation of a realistic plasma gamma ray source for Monte Carlo simulations. The methodology presented in this paper consists of several steps. First the generation of realistic plasma parameters with the code TRANSP on the basis of experimental measurements. Second the generation of sampling distribution functions from the calculated plasma parameters such as the calculation of the source position distribution function based on the rate densities for the gamma ray emitting reaction. Third the creation of realistic plasma gamma ray source for the code MCNP gamma ray transport simulation. The developed methodology was analysed on a MCNP tokamak model to demonstrate that the methodology generates a realistic plasma gamma ray source for Monte Carlo simulations.

理解聚变等离子体中快速离子的物理学被广泛认为是聚变托卡马克反应堆可靠运行的关键任务之一。对托卡马克的测量表明，当快速离子与等离子体燃料离子或与诸如铍，碳和氧的等离子体杂质反应时，会产生伽马射线。这些伽马射线的光谱学可用于测量血浆中的融合速率或行为以及融合反应产物（例如α粒子）的限制。为了在计算上支持实验，已经开发了一种方法，用于创建用于蒙特卡洛模拟的逼真的等离子伽马射线源。本文介绍的方法包括几个步骤。首先，在实验测量的基础上使用代码TRANSP生成实际的等离子体参数。第二，从计算出的等离子体参数生成采样分布函数，例如基于伽马射线发射反应的速率密度来计算源位置分布函数。第三，为代码MCNP伽马射线传输模拟创建现实的等离子体伽马射线源。在MCNP托卡马克模型上对开发的方法进行了分析，以证明该方法为蒙特卡洛模拟生成了真实的等离子体伽马射线源。