铌低温焙烧过程中的空位-氢相互作用
Vacancy-Hydrogen Interaction in Niobium during Low-Temperature Baking
摘要：
最近发现的一种改进的低温烘烤方法可以降低TESLA形超导腔的表面损耗，提高腔体的加速梯度。我们将表明，在低温烘烤的空位-氢复合物的动力学导致在2K下的有损纳米粒子的抑制，从而显着提高加速器性能。利用多普勒展宽正电子湮没谱、正电子湮没寿命谱和纳米压痕仪对欧洲XFEL铌片样品进行了研究。我们研究了{ \it in-situ}和{ \it ex-situ}退火过程中，在不同温度下，体样品和亚表面区域中空位的演化及其与氢的相互作用。
英文摘要：
A recently discovered modified low-temperature baking leads to reduced surface losses and an increase of the accelerating gradient of superconducting TESLA shape cavities. We will show that the dynamics of vacancy-hydrogen complexes at low-temperature baking lead to a suppression of lossy nanohydrides at 2\,K and thus a significant enhancement of accelerator performance. Utilizing Doppler broadening Positron Annihilation Spectroscopy, Positron Annihilation Lifetime Spectroscopy and instrumented nanoindentation, samples made from European XFEL niobium sheets were investigated. We studied the evolution of vacancies in bulk samples and in the sub-surface region and their interaction with hydrogen at different temperature levels during {\it in-situ} and {\it ex-situ} annealing.
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