用加压电子管调谐多室超导加速腔
Tuning of Multicell Superconducting Accelerating Cavities using Pressurized Balloons
摘要：
多腔超导加速腔的塑性调谐是粒子加速器腔研制过程中的关键环节。腔体在排列在低温恒温器串中之前，必须满足关于操作模式频率、场平坦度和偏心率的严格要求。在用氦容器装饰裸腔之后，焊接容器防止进入单个腔室，从而不允许任何进一步的局部调谐。目前，除了切割血管然后调整裸腔并将其修整回来之外，没有直接的方法来调整修整的腔，这将显著影响成本和进度。在本文中，我们提出了一种新的调谐技术已经夹套腔，是非侵入性和成本效益。所提出的方案采用加压气球暂时部署在腔体内作为一种手段，以局部化特定细胞中的机械变形。所提出的调谐技术被成功地利用，以恢复一个9细胞的1.3 GHz泰斯拉式腔。
英文摘要：
Plastic tuning of multicell superconducting accelerating cavities is crucial in the development cycle of cavities for particle accelerators. Cavities must meet stringent requirements regarding the operating mode frequency, field flatness, and eccentricity before lining them up in a cryomodule string. After dressing bare cavities with helium vessels, the welded vessel prevents access to individual cavity cells disallowing any further localized tuning. Currently, there is no straightforward way to tune dressed cavities other than cutting the vessel and then tuning the bare cavity and dressing it back, which would significantly impact cost and schedule. In this paper, we present a novel tuning technique for already jacketed cavities that is non-invasive and cost-effective. The proposed scheme employs pressurized balloons to be temporarily deployed inside the cavity as a means to localize mechanical deformation in specific cells. The proposed tuning technique was successfully utilized to recover a 9-cell 1.3 GHz tesla-style cavity.
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