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As optical clocks are improved to reach the frequency uncertainty below the10$^{-17}$ level, the frequency shift due to the blackbody radiation (BBR) hasbeen one of the major systematic effects hindering further improvement. Toevaluate the BBR shift of an Yb optical lattice clock at KRISS, we installed anin-vacuum BBR shield and made radiation thermometry using a black-coated-spherethermal probe. After we quantitatively measured the conduction loss of thethermal probe and the effects of all the external radiation sources, wedetermined the temperature at the atom trap site with an uncertainty of 13 mK,which corresponds to an uncertainty of 0.22 mHz in the clock frequency (afractional frequency of $4.2\times10^{-19}$). The total uncertainty of the BBRshift including the atomic response is $9.5\times10^{-19}$.

Evaluation of the blackbody radiation shift of an Yb optical lattice clock at KRISS