Stability and symmetry requirements of electron and ion beam fusion targets

Considerations of hydrodynamic stability impose severe restrictions on the design of electron and ion beam imploded fusion targets. Furthermore, in order to obtain a sufficiently spherical implosion, many target designs require electron or ion beams having a high degree of spherical symmetry. We have studied the stability and symetry requirements of several recently proposed target designs by numerical simulation using the computer program LASNEX. The ion beam targets we have studied are more vulnerable to instability than the electron beam targets.