论文标题
首次演示冷冻机传导冷却在实用CW加速梯度下运行的超导射频腔
First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients
论文作者
论文摘要
我们在超导射频（SRF）加速器腔中表现出实用的加速梯度，并使用冷冻机传导冷却冷却，这是一种冷却技术，不涉及常规液态氦浴的复杂性。首先提出设计，以使传导冷却椭圆形SRF腔。实施此设计，单个单元格650 MHz NB3SN腔使用高纯度铝热链路连接到4 K脉冲管冷冻机生成的加速度梯度在100％占空比时产生高达6.6 mV/m的加速梯度。实验是在简单的真空容器中用腔晶体组件进行的，完全没有循环的液体冷冻剂。我们预计，这种冷冻技术将使缺乏访问全堆栈氦气低温系统的感兴趣的加速器研究人员可以使用SRF技术。此外，该技术可以导致基于SRF的高平均电力电子光束的紧凑来源，用于环境保护和工业应用。提出了这种SRF紧凑型加速器的概念。
We demonstrate practical accelerating gradients on a superconducting radiofrequency (SRF) accelerator cavity with cryocooler conduction cooling, a cooling technique that does not involve the complexities of the conventional liquid helium bath. A design is first presented that enables conduction cooling an elliptical-cell SRF cavity. Implementing this design, a single cell 650 MHz Nb3Sn cavity coupled using high purity aluminum thermal links to a 4 K pulse tube cryocooler generated accelerating gradients up to 6.6 MV/m at 100% duty cycle. The experiments were carried out with the cavity-cryocooler assembly in a simple vacuum vessel, completely free of circulating liquid cryogens. We anticipate that this cryocooling technique will make the SRF technology accessible to interested accelerator researchers who lack access to full-stack helium cryogenic systems. Furthermore, the technique can lead to SRF based compact sources of high average power electron beams for environmental protection and industrial applications. A concept of such an SRF compact accelerator is presented.
