Medium-temperature furnace baking of 1.3 GHz 9-cell superconducting cavities at IHEP

被引：25

作者：

He, Feisi ^{[1
,2
,3
,4
]}

Pan, Weimin ^{[1
,2
,3
,4
]}

Sha, Peng ^{[1
,2
,3
,4
]}

Zhai, Jiyuan ^{[1
,2
,3
,4
]}

Mi, Zhenghui ^{[1
,2
,3
,4
]}

Dai, Xuwen ^{[1
,3
]}

Jin, Song ^{[1
,2
,3
,4
]}

Zhang, Zhanjun ^{[1
,3
]}

Dong, Chao ^{[1
,2
,3
]}

Liu, Baiqi ^{[1
,2
,3
]}

Zhao, Hui ^{[1
,3
]}

Ge, Rui ^{[1
,2
,3
,4
]}

Zhao, Jianbing ^{[1
,3
]}

Mu, Zhihui ^{[1
,3
]}

Du, Lei ^{[1
,2
,3
]}

Sun, Liangrui ^{[1
,2
,3
]}

Zhang, Liang ^{[1
,3
]}

Yang, Conglai ^{[1
,3
]}

Zheng, Xiaobing ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Accelerat Phys & Technol, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Ctr Superconducting RF & Cryogen, Inst High Energy Phys, Beijing 100049, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2021年 / 34卷 / 09期

关键词：

superconducting cavity; quality factor; gradient; medium-temperature furnace baking; vertical test;

D O I：

10.1088/1361-6668/ac1657

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Recently, heat treatment in the range of 250 degrees C-500 degrees C has been attempted with the aim of improving the quality factor (Q) of superconducting radio-frequency (SRF) cavities worldwide. Herein, medium-temperature (mid-T) furnace baking experiments were conducted at the Institute of High Energy Physics to obtain higher Q values. First, 1.3 GHz 1-cell cavities received mid-T furnace baking at different temperatures, resulting in not only the improvement of Q but also an anti-Q-slope behavior. Furthermore, mid-T furnace baking was applied to six 1.3 GHz 9-cell cavities, all of which indicated higher Q and anti-Q-slope behavior. The average Q was 3.8 x 10(10) at 16 MV m(-1). The maximum gradients of the 9-cell cavities were 22.7-26.5 MV m(-1). Finally, the mid-T furnace baked 1.3 GHz 9-cell cavities were welded with helium vessel, with no degradation in the vertical tests. In addition, the mid-T furnace baking process was simplified in comparison with European X-ray Free Electron Laser and Linear Coherent Light Source because of the cancellation of light electro-polishing. This simplification is beneficial in the mass production of SRF cavities with high Q, which are widely adopted in free electron lasers and high-energy colliders.

引用

页数：7