Design and multiphysics analysis of a 176 MHz continuous-wave radio-frequency quadrupole
Design and multiphysics analysis of a 176 MHz continuous-wave radio-frequency quadrupole
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DOI：
10.1103/physrevstab.17.072001
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发表时间：
2014-07
影响因子：
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通讯作者：
S. Kutsaev;B. Mustapha;P. Ostroumov;A. Barcikowski;D. Schrage;J. Rodnizki;D. Berkovits
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文献类型：
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作者：
S. Kutsaev;B. Mustapha;P. Ostroumov;A. Barcikowski;D. Schrage;J. Rodnizki;D. Berkovits
我们已经为SARAF升级项目开发了一种176 MHz连续波射频四极杆（cw）的新设计。在该频率下，所提出的设计是传统的四叶片结构。主要设计目标是提供最高可能的分流阻抗，同时将所需的射频功率限制为约120 kW，以实现可靠的连续波操作，并将长度限制为约4米。如果按设计建造，拟议的cw将是第一个四叶片cw建造作为一个单一的腔（不需要谐振耦合），不需要π模稳定环或偶极杆。为此，我们依赖于对结构的各个方面进行非常详细的3D模拟，以及在最近开发的ATLAS升级版上实现的加工精度水平。一个完整的三维模型的结构，包括叶片调制。使用电磁和多物理场模拟优化了设计。在选择叶片类型和几何形状之后，优化叶片底切，以沿结构沿着产生平场。最终设计具有良好的模式分离，如果按照设计建造，则不需要偶极杆，但在制造误差的情况下研究了它们的效果。调谐器也被设计和优化，以调整主模式，而不影响场的平坦度。在电磁优化设计的基础上，对该结构进行了多物理场工程分析。多物理场分析是一个耦合的电磁，热和机械分析。根据极限温度和变形要求，对冷却通道的路径和尺寸进行了优化。为了将其用于频率微调，仔细研究了频率对涡轮体和叶片冷却水温度的灵敏度。最后，设计了一个基于ATLAS耦合器的电感式射频功率耦合器，并进行了仿真。电磁设计优化是使用cst微波工作室和结果进行了验证，使用hfss和ansys。工程分析使用hfss和ansys进行，大部分的结果是使用新开发的cst Multiphysics软件包进行验证。
We have developed a new design for a 176 MHz cw radio-frequency quadrupole (RFQ) for the SARAF upgrade project. At this frequency, the proposed design is a conventional four-vane structure. The main design goals are to provide the highest possible shunt impedance while limiting the required rf power to about 120 kW for reliable cw operation, and the length to about 4 meters. If built as designed, the proposed RFQ will be the first four-vane cw RFQ built as a single cavity (no resonant coupling required) that does not require π -mode stabilizing loops or dipole rods. For this, we rely on very detailed 3D simulations of all aspects of the structure and the level of machining precision achieved on the recently developed ATLAS upgrade RFQ. A full 3D model of the structure including vane modulation was developed. The design was optimized using electromagnetic and multiphysics simulations. Following the choice of the vane type and geometry, the vane undercuts were optimized to produce a flat field along the structure. The final design has good mode separation and should not need dipole rods if built as designed, but their effect was studied in the case of manufacturing errors. The tuners were also designed and optimized to tune the main mode without affecting the field flatness. Following the electromagnetic (EM) design optimization, a multiphysics engineering analysis of the structure was performed. The multiphysics analysis is a coupled electromagnetic, thermal and mechanical analysis. The cooling channels, including their paths and sizes, were optimized based on the limiting temperature and deformation requirements. The frequency sensitivity to the RFQ body and vane cooling water temperatures was carefully studied in order to use it for frequency fine-tuning. Finally, an inductive rf power coupler design based on the ATLAS RFQ coupler was developed and simulated. The EM design optimization was performed using cst Microwave Studio and the results were verified using both hfss and ansys . The engineering analysis was performed using hfss and ansys and most of the results were verified using the newly developed cst Multiphysics package.