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孙虹  赵升初  葛明骐 《中国物理 C》2005,29(10):989-992
简要介绍空间磁场对纯铌超导加速腔性能的影响,以及在超导腔垂直测量时对空间磁场进行有效屏蔽的方法.由于多数磁性材料对应力和温度变化非常敏感,而且国内缺乏在低温下相关磁屏蔽材料性能的数据,为此对8种国产铁磁和软磁材料在低温下的初始磁导率进行了测量,并给出了相应的测试结果.最后介绍了作者研制的1.3GHz超导腔垂直测量低温恒温器内置式磁屏蔽装置及其性能.  相似文献   
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As part of the international research program on the superconducting cavity for the International Linear Collider (ILC) R&;D on the 1.3 GHz low loss superconducting cavities has been carried out at the Institute of High Energy Physics (IHEP) since 2005. A design of 1.3 GHz low loss cavity shape was proposed and six single-cell cavities of different niobium material were successfully fabricated with standard technology. In this study our priority was on large grain (LG) cavities. The two LG cavities were treated with complete procedures of surface treatments based on chemical polishing (CP) without electro polishing (EP) at IHEP. The two LG cavities and a fine grain cavity were sent to KEK for vertical testing. All the three cavities reached accelerating gradients higher than 35 MV/m and the maximum gradient of 40.27 MV/m was achieved in the LG cavity. This paper presents the process of the vertical RF tests and the comparison of the LG and fine grain cavities's performance.  相似文献   
3.
着重论述了超导腔的洛伦兹力失谐,并对704MHz/β=0.45单cell纯铌超导腔进行了静态洛伦兹力失谐分析和动态洛伦兹力失谐分析,对增加其机械稳定性的方式方法进行了讨论和计算,给出了其相应的加固方案.  相似文献   
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Large grain niobium has the potential of simplifying the production sequence and consequently reducing the cost of the superconducting RF cavities for ILC. To investigate the feasibility of fabrication and the possibility to achieve high gradient by large grain cavities, two 1.3GHz cavities were made of China large grain niobium and a series of vertical tests were carried out following several different surfaces treatment procedures. Two cavities have both reached the high gradient of more than 43MV/m repeatedly and the maximum accelerating field of 47.9MV/m has been achieved by China large grain niobium. This paper introduces the features of the fabrication and surface treatments on the large grain cavities and presents the preliminary results of the research.  相似文献   
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计划中的国际直线对撞机(简称 ILC), 已确定采用低温超导技术. 研究表明, ILC的整体造价与超导腔的加速梯度密切相关, 因此新型高梯度超导腔的研制, 已成为目前ILC的热门课题. 目前超导腔加速梯度的提高受限于超导体射频临界磁场(Hcrf), 希望通过腔形的优化设计, 来减小超导腔表面峰值磁场与加速梯度的比值(Hp/Eacc), 进而提高超导腔的加速梯度, 以满足ILC的要求. 目前, 具有代表性的高梯度超导腔新腔形有两种, 即低损耗超导腔(LLSCC)和重入式超导腔(RESCC). LLSCC相对于RESCC而言, 具有较低的Hp/Eacc, 因此在理论上LLSCC更易于达到较高的梯度. 作者对1.3GHz单cell高梯度低损耗超导腔的腔形进行了详细的研究, 给出了相应低损耗超导腔腔形, 并对这一设计结果进行了分析比较.  相似文献   
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