Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures
Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures
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DOI：
10.1088/0953-2048/26/10/102001
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发表时间：
2013-10-01
影响因子：
3.6
通讯作者：
Barkov, F.
中科院分区：
文献类型：
--
作者：
Grassellino, A.;Romanenko, A.;Barkov, F.
我们报告了一种表面处理，它系统地提高了Nb射频腔的品质因数，超出了对Nb的预期限制。在氮气或Ar气体的分压下进行热处理和随后对Nb腔表面进行电抛光相结合，可获得前所未有的低微波表面阻值，并将加速结构的效率提高到原来的3倍，从而降低了超导腔在脉冲和连续占空比下的低温负荷。与标准处理的Nb相比，表面电阻的场依赖性是相反的。
We report a surface treatment that systematically improves the quality factor of niobium radio frequency cavities beyond the expected limit for niobium. A combination of annealing in a partial pressure of nitrogen or argon gas and subsequent electropolishing of the niobium cavity surface leads to unprecedented low values of the microwave surface resistance, and an improvement in the efficiency of the accelerating structures up to a factor of 3, reducing the cryogenic load of superconducting cavities for both pulsed and continuous duty cycles. The field dependence of the surface resistance is reversed compared to standardly treated niobium.