The ultimate objective of the research effort being carried on around the world is the achievement of a useful level of power output from a thermonuclear plasma. A new scheme for a fusion device was designed. This design, beginning with the simple desire to eliminate the need for coping with plasma instabilities in an essentially static, hot compressed plasma, led to the concept of dynamic containment. In this scheme, the plasma is contained in a continuously maintained magnetic field generated by three alternating fields. Heating is accomplished through a series of successive shocks combined with ohmic heating by plasma currents. Such a cyclic device would be continuously running, meeting the Lawson criterion over a number of cycles, on the average.