二次离子质谱学研究进展
Advances in secondary ion mass spectroscopy
AI总结：
本文针对下一代超导射频加速腔工艺对铌中氮含量测量精度的需求，研究了影响二次离子质谱相对灵敏度因子的因素，实现了 SRF 腔典型材料中不同深度氮浓度优于 10% 的测量精度。
摘要：
铌中氮的精确二次离子质谱（SIMS）测量依赖于使用离子注入制备的高度等效标样，通过测定相对灵敏度因子（RSF）将氮信号强度转换为氮含量。ppm 级氮含量的准确 RSF 值愈发关键，因为下一代超导射频（SRF）加速腔的工艺正追求更高精度。本文研究了影响 RSF 值测量的因素，目标是在块体内部不同深度的氮浓度测量中可靠地达到优于 10% 的精度。针对 SRF 腔的典型材料，通过对各环节的严格把控，已实现这一目标。
英文摘要：
Accurate SIMS measurement of nitrogen in niobium relies on the use of closely equivalent standards, made by ion implantation, to convert nitrogen signal intensity to nitrogen content by determination of relative sensitivity factors (RSF). Accurate RSF values for ppm-range nitrogen contents are increasingly critical, as more precision is sought in processes for next-generation superconducting radio-frequency (SRF) accelerator cavities. Factors influencing RSF value measurements were investigated with the aim of reliably attaining better than 10% accuracy in N concentrations at various depths into the bulk. This has been accomplished for materials typical of SRF cavities at the cost of great attention to all aspects.
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