Magnetic Field Vector Measurements Using Doppler-Free Saturation Spectroscopy

Knowing the magnetic field inside a fusion device is essential for understanding and validating performance, but measuring the magnetic field without perturbing it is exceedingly challenging. This Capability Team will build a non-perturbative, portable diagnostic to measure the topology of the equilibrium magnetic field vector in potentially transformative, magnetically confined fusion devices. The technique to be used, Doppler-free saturation spectroscopy (DFSS), is a pump/probe laser-based technique that has demonstrated magnetic field measurement accuracy of