325 MHz中<i>β</i>超导Spoke腔的腔型对比和选择

张蒙; 贺斐思; 潘卫民

doi:10.11884/HPLPB201931.190081

325 MHz中β超导Spoke腔的腔型对比和选择

doi: 10.11884/HPLPB201931.190081

张蒙^{1, 2,},
贺斐思²,
潘卫民^{1, 2}

1.
中国科学院大学, 北京 100049
2.
中国科学院粒子加速物理与技术重点实验室, 北京 100049

基金项目:

国家重点基础研究发展计划项目 2014CB845505

详细信息

作者简介:
张蒙(1993－), 男，硕士，主要从事加速器超导高频Spoke腔的计算仿真方面研究; zhangmeng@ihep.ac.cn

中图分类号: TN815
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出版历程
- 收稿日期: 2019-03-28
- 修回日期: 2019-05-28
- 刊出日期: 2019-11-15

Design and selection of 325MHz medium β Spoke cavity

Zhang Meng^{1, 2
,},
He Feisi²,
Pan Weimin^{1, 2}

1.
University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Particle Acceleration Physics &Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 中国科学院高能物理研究所一直在研究频率为325 MHz、中低β Spoke超导加速腔，以应用在加速器驱动的次临界系统(ADS)的强流质子直线加速器中。通过对超导腔设计方法和设计原则的研究，使用CST仿真软件设计了单Spoke腔、双Spoke腔、三bar Spoke腔三种Spoke腔型。其中三bar Spoke腔和双Spoke腔一样，都有着三个加速间隙，但是Spoke柱的结构不同。在腔型设计中，对三种Spoke腔的模型均作了参数化处理。然后通过CST的参数化扫描来优化腔体形状以使得峰值电场与加速梯度的比值最小，同时使峰值磁场与加速梯度的比值处于较低范围。本文对三种腔型进行了高频结构优化和参数分析，选用了双Spoke腔型作为设计方案，并对电磁场等进行了优化设计。
- 质子加速器 /
- 单Spoke腔 /
- 双Spoke腔 /
- 三bar Spoke腔 /
- 中β
Abstract: A 325 MHz Spoke cavity at medium and low β is developed in institute of High Energy Physics (IHEP) for the CiADS linac. Through the study on the principle of designing a superconducting cavity, three kinds of Spoke cavities including single Spoke cavity, double Spoke cavity and 3-bar Spoke cavity, were designed by the CST MWS.Although both the 3-bar Spoke and the double Spoke have a 3-gap structure, their Spoke bars are different. In the process of cavity design, parametric modeling was used to construct the cavity shape. Then the cavity shape was optimized by the parametric sweep in the CST MWS to minimize ratio of peak electric field to accelerating gradient (E_P/E_acc) while keeping ratio of peak magnetic field to accelerating gradient (B_P/E_acc) at a reasonably low range. Through the comparison of RF performance parameters, a double Spoke structure was selected as the design, and further optimization for electromagnetic field of double Spoke cavity is carried out.
- proton accelerator /
- single Spoke cavity /
- double Spoke cavity /
- 3-bar Spoke cavity /
- medium β

HTML全文

图 1 CST中建立的三种Spoke腔

Figure 1. Spoke cavities established in CST

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图 2 CST中建立的Spoke柱模型

Figure 2. poke bar models established in CST

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图 3 Spoke腔对应的LC谐振电路

Figure 3. LC resonant circuit corresponding to Spoke cavity

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图 4 CST中建立的Spoke腔模型的切面视图及其主要参数

Figure 4. Cut-away views of the Spoke cavity model in CST and the main geometric parameters

下载: 全尺寸图片幻灯片

图 5 Spoke腔的空间电场分布和空间磁场分布

Figure 5. The distribution of electric field and magnetic field

下载: 全尺寸图片幻灯片

图 6 双Spoke腔芯棒中心的尺寸与峰值电场比和R/Q关系的优化曲线

Figure 6. E_P/E_acc and R/Q vs dimensions of the Spoke aperture

下载: 全尺寸图片幻灯片

图 7 双Spoke腔芯棒基部的尺寸与峰值磁场比和R/Q关系的优化曲线

Figure 7. B_P/E_acc and R/Q vs dimensions of the Spoke base

下载: 全尺寸图片幻灯片

图 8 双Spoke腔端盖尺寸与峰值电磁场比和R/Q关系的优化曲线

Figure 8. (a) B_P/E_acc and R/Q vs D₁, (b) B_P/E_acc and R/Q vs D₂

下载: 全尺寸图片幻灯片

表 1 三种腔型高频参数对比

Table 1. Major RF performance parameters of three kinds of Spoke cavities

	F/MHz	E_P/(MV/m)	B_P/mT	E_acc/(MV/m)	E_P/E_acc	(B_P/E_acc)/[mT/(MV·m^-1)]	R/Q/Ω	G/Ω	TTF_max
single Spoke cavity	325.11	5.40	12.54	1.56	3.46	8.03	258	113	0.82
double Spoke cavity	325.24	4.37	12.09	1.33	3.29	9.10	412	120	0.78
3-bar cavity	325.09	3.94	7.52	1.03	3.30	6.30	340	127	0.81

下载: 导出CSV

表 2 双Spoke腔的详细几何参数

Table 2. Main geometric parameters of the double Spoke cavity (mm)

D_cav	L_iris	L_cav	D	D₂	H_e	H₁	T₁	W₁	R₁	T₂	W₂	R₂
551	565	748	166	306	91.5	68	51	95	26	167	218	55

下载: 导出CSV

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