Monte Carlo radiation transport simulations were used to calculate the slow positron yields from tungsten foil positron moderators at a reactor-based slow positron source. The slow positron generation rates were coupled to a simple electrostatic extraction model to estimate the yield of extractable slow positrons from the source. These calculations were used to optimize the foil thicknesses, length, pitch, and extraction voltages.

中文翻译：

---

优化基于反应堆的慢正电子源的慢化剂几何形状和厚度

蒙特卡罗辐射传输模拟用于计算基于反应堆的慢正电子源中钨箔正电子慢化剂的慢正电子产率。缓慢的正电子生成速率与简单的静电提取模型耦合，以估算可从源中提取的缓慢的正电子的产量。这些计算被用来优化箔的厚度，长度，间距和引出电压。