基于并行特征解算器Omega3p的JLC/NLC RDDS结构设计
Design of the JLC/NLC RDDS Structure Using Parallel Eigensolver Omega3p
摘要：
JLC/NLC主直线加速器的圆形阻尼失谐结构（RDDS）的复杂性是由射频效率和偶极子尾场抑制的考虑驱动的。作为JLC/NLC的时间和成本节省措施，3D RDDS单元的尺寸通过计算机建模确定到制造精度内，使得一旦组装结构就不需要调谐。RDDS结构的频率误差容限对于基模约为1 MHz，对于偶极模约为几MHz。在X波段频率，这些对应于主要单元尺寸上的微米级误差。这样的分辨率水平需要高度精确的场解算器和大量的计算机资源。并行有限元特征解算器Omega 3 P是在SLAC开发的，可在NERSC的Cray T3 E等大规模并行计算机上运行。该代码被应用于RDDS单元尺寸的设计，精确到制造精度。我们将提出使用这些代码来确定RDDS尺寸的数值方法，并将数值预测与使用这些尺寸金刚石车削的RDDS原型的冷测试测量进行比较。
英文摘要：
The complexity of the Round Damped Detuned Structue (RDDS) for the JLC/NLC main linac is driven by the considerations of rf efficiency and dipole wakefield suppression. As a time and cost saving measure for the JLC/NLC, the dimensions of the 3D RDDS cell are being determined through computer modeling to within fabrication precision so that no tuning may be needed once the structures are assembled. The tolerances on the frequency errors for the RDDS structure are about one MHz for the fundamental mode and a few MHz for the dipole modes. At the X-band frequency, these correspond to errors of a micron level on the major cell dimensions. Such a level of resolution requires highly accurate field solvers and vast amount of computer resources. A parallel finite-element eigensolver Omega3P was developed at SLAC that runs on massively parallel computers such as the Cray T3E at NERSC. The code was applied in the design of the RDDS cell dimensions that are accurate to within fabrication precision. We will present the numerical approach of using these codes to determine the RDDS dimensions and compare the numerical predictions with the cold test measurements on RDDS prototypes that are diamond-turned using these dimensions.
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