Resilience of Fiber-Bragg Grating Optical Sensors Under Neutron Irradiation At 77 K

Optical fiber sensors are promising candidates for quench protection systems in superconducting magnets. When these magnets are used for nuclear fusion devices, the optical fibers will experience high radiation doses and dose rates of neutron radiation. Here we focus on fiber-Bragg gratings - passive optical temperature and strain sensors. We show that under cryogenic neutron irradiation up to
$4.2 \times 10^{14} \textrm {n/cm}^{2}$
at 77K, the Bragg reflections from the gratings show negligible drift.