Comparison of sawtooth heat pulses across confinement regimes in Alcator C-Mod plasmas

Prior studies of heat pulses from sawteeth in TFTR and DIII-D experiments found that the thermal conductivities derived from heat pulses ($\chi^{hp}$) are increased by a factor of a few to an order of magnitude over the thermal conductivities derived from power balance ($\chi^{pb}$) and suggest a strong dependence of $\chi$ on the local temperature gradient $[1]$. This may have important consequences for turbulence modeling that ignores the role of sawteeth by using profiles representative of the mean. In this study, we investigate Alcator C-Mod experiments and apply methods similar to those used in {{ref.} [1]} to model the evolution of heat pulses propagating outward from the core. Calculations of thermal conductivities derived from sawtooth heat pulses will be presented as a function of density and confinement regime and compared with those derived from power balance. This work is supported by USDoE awards DE-FC02-99ER54512, DE-AC02-09CH11466 and DE-FG03-96ER-54373. \\[4pt] [1] E. Fredrickson \textit{et al.}, Physics of Plasmas \textbf{7}, 5051 (2000).