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射频超导腔的低温烘烤研究

Researches on Bake Effect on RF Superconducting Cavities
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摘要 射频超导腔在高场下的Q-slope严重影响到高加速梯度的获得.研究表明100-150℃低温烘烤(Bake)对改善超导腔的Q-slope有比较好的效果.本文在大量超导腔Bake实验的基础上,对Bake进行了系统的研究。研究结果显示,电抛光(EP)超导腔经过Bake后,平均加速梯度和高Q值(1×1010)时的加速梯度均增加3.5MV/m以上,最大加速梯度时的Q值得到增加,Q-slope得到改善.对Bake温度的研究表明,在最佳Bake温度范围内,高的Bake温度能得到相对高的Q值.对比化学抛光(BCP)和EP超导腔可知,要得到好的加速性能,需要60～80μm的EP.超过10-15μm的BCP会使EP超导腔品质下降.用氧扩散模型对Bake作出了解释. The Q-slope at high gradient affects the performance of superconducting cavity greatly. Recent researches show that low temperature （100-150）℃ heat treatment （bake） has positive effects on the performance of superconducting cavities. A lot of cavity tests are analyzed based on bake treatment. The average gradient Eacc,max and Eacc at Q=1×10^10 are increased by more than 3.5MV/m. Q at Eacc,max is increased and the Q-slope is improved. Analysis on bake temperature shows that higher bake temperature leads to higher Q value. Comparison of BCP and EP cavities shows that at least 60-80μm EP is needed for BCP surface. More than 10-15μm removal of the surface by BCP will degrade the performance of an EP cavity. Oxygen diffusion model is used to illustrate bake effect.
作者 郝建奎 赵夔 朱凤
机构地区 重离子物理教育部重点实验室北京大学重离子物理研究所
出处 《高能物理与核物理》 EI CSCD 北大核心 2005年第9期918-922,共5页 High Energy Physics and Nuclear Physics
关键词 超导腔 Q-slope BAKE 电抛光 低温烘烤 射频 加速梯度 温度范围 高Q值 化学抛光 superconducting cavity, Q-slope, Bake, electropolishing
分类号 TL503.2 [核科学技术—核技术及应用]
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参考文献14

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高能物理与核物理
2005年 第9期

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