Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada.
TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
Rev Sci Instrum. 2023 Feb 1;94(2):023305. doi: 10.1063/5.0137368.
A new high field spectrometer has been built to extend the capabilities of the β-detected nuclear magnetic resonance (β-NMR) facility at TRIUMF. This new beamline extension allows β-NMR spectroscopy to be performed with fields up to 200 mT parallel to a sample's surface (perpendicular to the ion beam), allowing depth-resolved studies of local electromagnetic fields with spin polarized probes at a much higher applied magnetic field than previously available in this configuration. The primary motivation and application is to allow studies of superconducting radio frequency (SRF) materials close to the critical fields of Nb metal, which is extensively used to fabricate SRF cavities. The details of the design considerations and implementation of the ultra-high vacuum (UHV) system, ion optics, and beam diagnostics are presented here. Commissioning of the beamline and spectrometer with radioactive ions are also reported here. Future capabilities and applications in other areas are also described.
已建造了一个新的高磁场光谱仪，以扩展 TRIUMF 中β-探测核磁共振（β-NMR）设施的功能。这条新的束流线扩展允许在高达 200 mT 的磁场中进行β-NMR 光谱学实验，该磁场与样品表面平行（垂直于离子束），允许使用自旋极化探针在比以前更高的外加磁场下进行局部电磁场的深度分辨研究。这种配置。主要动机和应用是允许在接近铌金属临界场的情况下研究超导射频（SRF）材料，铌金属被广泛用于制造 SRF 腔。本文介绍了超高真空（UHV）系统、离子光学和束流诊断的设计考虑因素和实现细节。本文还报告了放射性离子束对谱仪和谱仪的调试情况。还描述了其他领域的未来功能和应用。
