This report summarizes the results of a 3 year effort to develop long implosion time (>150 ns) z-pinch loads for use on the planned Decade Quad (DQ) pulsed power generator. Well diagnosed experiments demonstrated high quality, 200 ns implosions using argon gas puff loads. We show that solid fill and double shell mass distributions perform better than thin shells. The dual plenum, double shell load has unique diagnostic features that ...