  Fluctuations of conserved quantities such as baryon number (B), electric
charge number (Q), and strangeness number (S), are sensitive to the correlation
length and can be used to probe non-gaussian fluctuations near the critical
point. Experimentally, higher moments of the multiplicity distributions have
been used to search for the QCD critical point in heavy-ion collisions. In this
paper, we report the efficiency-corrected cumulants and their ratios of mid-
rapidity (|y| < 0.5) net-kaon multiplicity distributions in Au+Au collisions at
7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV collected in 2010, 2011, and
2014 with STAR at RHIC. The centrality and energy dependence of the cumulants
and their ratios, are presented. Furthermore, the comparisons with baseline
calculations (Poisson) and non-critical-point models (UrQMD) are also
discussed.
