DARHT- II尾场最小化的RF单元模拟与实验
RF Cell Modeling and Experiments for Wakefield Minimization in DARHT-II
摘要：
直线感应加速器的电子束会受到有限尺寸加速腔产生的射频场的偏转力。当组装由相同单元组成的长直线加速器时，这些力可以显著地影响束流。最近的技术在计算建模，模拟和实验20兆电子伏DARHT-II（双轴射线流体动力学测试）加速器细胞被发现，以减少尾场阻抗的细胞从800欧姆/米到350欧姆/米和实验结果证实了建模工作的结果。通过对加速器结构、材料、材料调谐和几何形状的参数研究，获得了电池的性能增加。作为这项工作的结果，人们发现，厚度调谐铁氧体产生了50%的扣除尾场阻抗在低频带，很容易调谐的基础上的材料厚度。还发现，成形的金属部分允许高Q谐振被失谐，从而降低谐振的幅度并提高电池的性能。对于用于该单元的几何形状，大约45度角在影响尾场模式方面具有最佳性能。
英文摘要：
Electron beams of linear induction accelerators experience deflective forces caused by RF fields building up as a result of accelerating cavities of finite size. These forces can significantly effect the beam when a long linac composed of identical cells is assembled. Recent techniques in computational modeling, simulation, and experiments for 20 MeV DARHT-II (Dual Axis Radiographic Hydrodynamic Test) accelerator cells were found to reduce the wakefield impedance of the cells from 800 ohms/meter to 350 ohms/meter and experimental results confirm the results of the modeling efforts. Increased performance of the cell was obtained through a parametric study of the accelerator structure, materials, material tuning, and geometry. As a result of this effort, it was found that thickness-tuned ferrite produced a 50% deduction in the wakefield impedance in the low frequency band and was easily tunable based on the material thickness. It was also found that shaped metal sections allow for high-Q resonances to be de-tuned, thus decreasing the amplitude of the resonance and increasing the cell s performance. For the geometries used for this cell, a roughly 45 degree angle had the best performance in affecting the wakefield modes.
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