论文标题
使用加压气球调整多细胞超导加速腔
Tuning of Multicell Superconducting Accelerating Cavities using Pressurized Balloons
论文作者
论文摘要
多细胞超导加速腔的塑料调节在颗粒加速器的空腔发育周期中至关重要。在将它们在冷冻模块串中衬上之前，腔必须满足操作模式频率，场平平和偏心率的严格要求。在用氦气容器将裸露的腔体涂抹后，焊接容器可防止进入单个空腔细胞，从而不允许任何进一步的局部调节。目前，除了切割船只，然后对裸腔调整并将其重新调整以外，还没有直接调整穿着腔的直接方法，这将极大地影响成本和时间表。在本文中，我们介绍了一种新颖的调整技术，适用于已经不创和具有成本效益的已经是外套的腔。所提出的方案采用加压气球暂时部署在腔体内，以此来定位特定细胞中的机械变形。所提出的调整技术已成功地用于恢复9细胞1.3 GHz Tesla风格的腔。
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.
