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This paper reports in-pile testing of multiplexed Type-II fiber Bragg gratings by femtosecond laser in radiation-hardened fibers in MIT research reactor with a total neutron fluence of 1020 n/cm2 at temperature up to 560 ℃.

This paper proposed accurate in-core distributed temperature predictions by random forest modeling based on optical measurements. The prediction error is within 3.6% of the temperature swing in the extremely harsh environment.