Schematic illustration of energy-cascade behavior for different injection and truncation scales. For injection at k₀d_i = 10⁻² with truncation scale at k_c = 100 k₀, the cascade could reach ion scales (kd_i ∼ 1). When the truncation scale is reduced to k_c = 10 k₀, the cascade is cut off before ion scales are reached. For a higher energy injection wavenumber (k₀d_i = 10⁻¹) with the same truncation scale k_c = 10 k₀, the cascade can still reach ion scales.