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首页> 外文期刊>Physical Review. Accelerators and Beams >Thermocurrents and their role in high span class="aps-inline-formula"math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"miQ/mi/math/span cavity performance
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Thermocurrents and their role in high span class="aps-inline-formula"math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"miQ/mi/math/span cavity performance

机译：热电流及其在高 class =“ aps-inline-formula”> Q < / mi> 腔体性能

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摘要

Over the past years it became evident that the quality factor of a superconducting cavity is not only determined by its surface preparation procedure, but is also influenced by the way the cavity is cooled down. Moreover, different data sets exist, some of which indicate that a slow cooldown through the critical temperature is favorable while other data states the exact opposite. Even though there were speculations and some models about the role of thermocurrents and flux-pinning, the difference in behavior remained a mystery. In this paper we will present a consistent theoretical model which we confirmed by data that describes the role of thermocurrents, driven by temperature gradients and material transitions. We will clearly show how they impact the quality factor of a cavity, discuss our findings, relate it to findings at other labs and develop mitigation strategies which especially address the issue of achieving high quality factors of so-called nitrogen doped cavities in horizontal tests.
机译：在过去的几年中，很明显，超导腔的品质因数不仅由其表面制备程序决定，而且还受腔冷却方式的影响。此外，存在不同的数据集，其中一些表明通过临界温度的缓慢冷却是有利的，而其他数据则恰好相反。尽管有关于热电流和助焊剂作用的推测和一些模型，但行为差异仍然是个谜。在本文中，我们将提供一个一致的理论模型，我们已通过描述温度梯度和材料转变驱动的热电流作用的数据证实了这一模型。我们将清楚地显示它们如何影响型腔的品质因数，讨论我们的发现，将其与其他实验室的发现联系起来并制定缓解策略，这些策略特别解决在水平测试中实现所谓的氮掺杂型腔的高质量因数的问题。

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