Physical Requirements for fusion – overcoming the Coulomb Barrier
Note: center of the Sun has T~15 X 106 K, r ~100 g cm-3
In an ablation-driven capsule implosion with a shock velocity of 300 km s-1, a hot spot with an areal mass of >0.1 g cm-2 and a temperature of several keV can ignite (alpha particle energy deposition exceeds losses).  Taken from Lindl, Physics of Plasmas, 2, 3933, 1995.