High Field Diamond Magnetometry Towards Tokamak Diagnostics

• URL: http://arxiv.org/abs/2601.13413v1
• Date: Mon, 19 Jan 2026 21:49:03 GMT
• Title: High Field Diamond Magnetometry Towards Tokamak Diagnostics
• Abstract summary: Nitrogen vacancy centres (NVC) in diamond have been widely used for near-dc magnetometry.<n>An NVC magnetometer placed in a tokamak will need to operate within a $geq$ 1 T magnetic field.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Nitrogen vacancy centres (NVC) in diamond have been widely used for near-dc magnetometry. The intrinsic properties of diamonds make them potential candidates for tokamak fusion power diagnostics, where radiation-hard magnetometers will be essential for efficient control. An NVC magnetometer placed in a tokamak will need to operate within a $\geq$ 1 T magnetic field. In this work, we demonstrate fibre-coupled ensemble NVC optically detected magnetic resonance (ODMR) and magnetometry measurements at magnetic fields up to 1.2 T. Sensitivities of approximately 240 to 600 nT/$\sqrt{\textrm{Hz}}$ and 110 nT/$\sqrt{\textrm{Hz}}$ are achieved in a (10-150) Hz frequency range, for non-degenerate and near-$\langle$111$\rangle$ field alignments respectively.

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