Expansion of two-ion-species spherical plasmas as a source of mono-energetic ions

The problem of collisionless expansion of two-species spherical plasma into vacuum is solved numerically by using of a spherical coordinate electrostatic particle code. A theoretical solution is also presented for the case of Coulomb explosion when light ions can be treated as an impurity. The expansion of the two-ion-species clusters is shown to be a source of high quality mono-energetic ions moving in the solid angle of 4π. Dependencies of the light ions parameters on the electron average energy and target composition are discussed. As example, two different target designs are compared.