Quasilinear critical gradient model for the intermittency of Alfven eigenmode transport of energetic particles}$^{\mathrm{1}}$

The critical gradient model (CGM) for the time-average transport of energetic particles (EP) by Alfven eigenmodes (AEs) has been verified by local nonlinear GYRO gyrokinetic simulations [1], validated by DIII-D experiments [2], and used to predict ITER EP confinement loss [3]. High intermittency of even low time-average EP transport loses at the edge of ITER could cause significant wall erosion. Here we explore the nature of intermittent AE-EP transport with a simplified quasilinear critical gradient model (QLCGM) using the time dependent EP density transport code ALPHA [3]. In agreement with DIII-D experiments [4] the intermittency is found to increase with the EP source strength. \\ \\ $[1]$ E. M. Bass and R. E. Waltz, \textit{Phys. Plasmas} \textbf{17}, 112319 (2010)\\ \\ $[2]$ R.E. Waltz, E.M. Bass, W.W. Heidbrink, and M.A. VanZeeland, \textit{Nucl. Fusion} \textbf{55} 123012 (2015)\\ \\ $[3]$ R. E. Waltz and E. M. Bass, \textit{Nucl. Fusion} \textbf{54}, 104006 (2014)\\ \\ $[4]$ C. S. Collins et al, \textit{Phys. Rev. Lett.} \textbf{116}, 095001 (2016)