A New High Parallel-Field Spectrometer at TRIUMF's $\beta$-NMR Facility

Abstract

A new high field spectrometer has been built to extend the capabilities of the $\beta$-detected nuclear magnetic resonance ($\beta$-NMR) facility at TRIUMF. This new beamline extension allows $\beta$-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, 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.

Co-authors' misspelled names are fixed to conform with their ORCiD. Typho in eq. (1) is fixed

References in corpus (5)

• Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects
• Giant Vortices Below the Surface of NbSe${}_2$ Detected Using Low Energy $\beta$-NMR
• Microscopic Dynamics of Li${}^{+}$ in Rutile TiO${}_2$ Revealed by ${}^8$Li $\beta$-detected NMR
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Cited by in corpus (5)

• Depth-resolved measurements of the Meissner screening profile in surface-treated Nb
• Mid-T Heat Treatments on BCPed Coaxial Cavities at TRIUMF
• Depth-resolved measurement of the Meissner screening profile in a niobium thin film from spin-lattice relaxation of the implanted $\beta$-emitter ${}^8$Li
• Depth-resolved Characterization of Meissner Screening Breakdown in Surface Treated Niobium
• Superconducting properties of thin film $\mathrm{N}{\mathrm{b}}_{1-\mathrm{x}}\mathrm{T}{\mathrm{i}}_{\mathrm{x}}\mathrm{N}$ studied via the NMR of implanted ${}^8$Li