标题： TTF-III 输入耦合器的射频热和新冷部分设计研究 for Project-X 显示英文标题

标题： RF thermal and new cold part design studies on TTF-III input coupler for Project-X

摘要： 射频功率耦合器是超导（SC）直线加速器中的关键组件。它为SC腔提供射频功率，并连接不同的温度层（1.8K、4.2K、70K和300K）。TTF-III耦合器是项目X的高能（HE）直线加速器中最有前景的候选之一，但由于温暖内导体的温升相对较高，无法满足平均功率要求，因此需要进行一些设计修改。在本文中，我们描述了对具有RRR值为10和100的温暖内导体上的铜涂层厚度的仿真研究。我们的目的是重新平衡动态和静态负载，最终降低温暖内导体的温升。此外，为了获得更强的耦合、更好的功率处理能力和更少的多路径概率，提出了一种新的冷部件设计，使用60mm同轴线；相应的多路径仿真研究也已进行了调查。 显示英文摘要

摘要： RF power coupler is one of the key components in superconducting (SC) linac. It provides RF power to the SC cavity and interconnects different temperature layers (1.8K, 4.2K, 70K and 300K). TTF-III coupler is one of the most promising candidates for the High Energy (HE) linac of Project X, but it cannot meet the average power requirements because of the relatively high temperature rise on the warm inner conductor, some design modifications will be required. In this paper, we describe our simulation studies on the copper coating thickness on the warm inner conductor with RRR value of 10 and 100. Our purpose is to rebalance the dynamic and static loads, and finally lower the temperature rise along the warm inner conductor. In addition, to get stronger coupling, better power handling and less multipacting probability, one new cold part design was proposed using 60mm coaxial line; the corresponding multipacting simulation studies have also been investigated.