Essential experimental results at ambipolar (tandem) mirror traps are brief
ly reviewed. Progress on longitudinal plasma confinement by ambipolar barri
ers (plugs) and on suppression of transverse anomalous plasma losses in a s
olenoid are noted. Experimental exploration of MHD-stabilization of high pr
essure plasma (beta similar to 1) by vacuum chamber walls and of ion pumpin
g from stationary thermal barriers is emphasized. Geometry of an axisymmetr
ic trap, in which self-sustaining D-T reaction is possible, is briefly desc
ribed.