论文标题
用于研究高级低温气体阻止器中空间电荷效应的细胞粒子技术
Particle-in-Cell Techniques for the Study of Space Charge Effects in the Advanced Cryogenic Gas Stopper
论文作者
论文摘要
线性气体阻止者被广泛用于将高能，稀有异位素束和反应产物转化为具有较小的横向发射和能量扩散的低能束。高能离子的停止是通过与缓冲气体的互动（通常是氦气）来实现的，产生了大量的HE $^+$/e $^ - $ $ pairs。晚期的低温气体阻止器（ACG）是为高强度，稀有异位束束的快速，有效停止和提取而设计的。作为设计过程的一部分，开发了一项全面的粒子代码，以优化在存在空间充电的情况下从ACG中从ACG中提取和提取稀有同位素的运输，包括He $^+$/e $^ - $ $^ - $ dynamics，包括气体流量，RF地毯，RF地毯以及通过喷嘴或孔口提取离子的缓冲气体相互作用。与实验相比，介绍了模拟的详细信息。
Linear gas stoppers are widely used to convert high-energy, rare-isotope beams and reaction products into low-energy beams with small transverse emittance and energy spread. Stopping of the high-energy ions is achieved through interaction with a buffer gas, typically helium, generating large quantities of He$^+$/e$^-$ pairs. The Advanced Cryogenic Gas Stopper (ACGS) was designed for fast, efficient stopping and extraction of high-intensity, rare-isotope beams. As part of the design process, a comprehensive particle-in-cell code was developed to optimize the transport and extraction of rare isotopes from the ACGS in the presence of space charge, including He$^+$/e$^-$ dynamics, buffer gas interactions including gas flow, RF carpets, and ion extraction through a nozzle or orifice. Details of the simulations are presented together with comparison to experiment when available.
