Beam breakup calculations for the second axis of DARHT

W. Fawley, Y. Chen, T. Houck
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引用次数: 1

Abstract

The accelerator for the second axis of the Dual Axis Radiographic Hydrodynamic Test (DARHT) facility will produce a 4-kA, 20-MeV, 2-/spl mu/s output electron beam with a design goal of less than 1000 /spl pi/ mm-mrad normalized transverse emittance and less than 0.5-mm beam centroid motion. In order to meet this goal, the beam transport must have excellent optics and the beam breakup instability (BBU) must be limited in growth. Using a number of simulation codes such as AMOS and BREAKUP, we have modeled the transverse impedances of the DARHT-II accelerator cells and the electron beam response to different transverse excitations such as injector RF noise, magnetic dipole fields arising from the 90-degree bend between the cathode stalk and insulator column, and downstream solenoid alignment errors. The very low Q (/spl sim/2) predicted for the most important TM dipole modes has prompted us to extend the BREAKUP code to be able to use the dipole wakefields calculated by AMOS in addition to the most usual discrete frequency BBU mode model. We present results for the predicted BBU growth and the empirical sensitivity to various machine parameters.
DARHT第二轴的光束破裂计算
双轴射线成像流体动力测试(DARHT)设备的第二轴加速器将产生4 ka, 20 mev, 2-/spl μ s输出电子束,其设计目标是标准化横向发射率小于1000 /spl pi/ mm-mrad,光束质心运动小于0.5 mm。为了实现这一目标,光束输运必须具有优异的光学性能,并且必须限制光束破裂不稳定性(BBU)的增长。利用AMOS和短句来源等多个仿真代码,模拟了DARHT-II加速器单元的横向阻抗和电子束在注入器射频噪声、阴极杆与绝缘体柱之间90度弯曲产生的磁偶极子场以及下游螺线管对准误差等不同横向激励下的响应。对于最重要的TM偶极子模式预测的非常低的Q (/spl sim/2)促使我们扩展了分解代码,以便能够使用AMOS计算的偶极子尾流场,以及最常见的离散频率BBU模式模型。我们给出了预测BBU生长和对各种机器参数的经验灵敏度的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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