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If the electrons in a plasma are suddenly heated, the resulting change inDebye shielding causes the ion kinetic energy to quickly increase. For thefirst time, this correlation heating, which is much faster than collisionalenergy exchange, is rigorously derived for a moderately coupled, electron-ionplasma. The electron-ion mass ratio is taken to be the smallest parameter inthe BBGKY hierarchy, smaller even than the reciprocal of the plasma parameter.This ordering differs from conventional kinetic theory by making the electroncollision rates faster than the ion plasma frequency, which allows strongercoupling and makes the ion heating a function only of the total energy suppliedto the electrons. The calculation uses known formulas for correlations in atwo-temperature plasma, for which a new, elementary derivation is presented.Suprathermal ions can be created more rapidly by this mechanism than byion-electron Coulomb collisions. This means that the use of a femtosecond laserpulse could potentially help to achieve ignition in certain fast ignitionapproaches to ICF.

Fast Correlation Heating in Moderately Coupled Electron-Ion Plasmas