We used an idealized initial state in which all moments m i have initial value (0, -m o sin ϕ, m o cos ϕ), where m o is the magnitude of m i and ϕ is the initial flip angle, which was set to -1 o . The control parameter of the dipolar field effects in our simulations was the magnetization density parameter m o , which can be related to the average dipolar field ω dip at equilibrium: ω dip = γ H µ 0 2m 0 3 for a disk-shaped sample and ω dip = γ H µ 0 2m 0 6 for a cylinder. Using these numerical tools, we performed simulations of the magnetization dynamics that follows an initial period of spin DNP-hyperpolarization ending by a small trigger pulse, for models (A) and (B) above that pertain to different experimental conditions, namely, DNP samples composed of a mixture of 1 H/ 2 H, or of protons only.