[en] There are three confinement systems now in operation or under construction at LLL: the 2XIIB, the Tandem Mirror Experiment (TMX), and the Mirror Fusion Test Facility (MFTF). 2XIIB relies on magnetic fields to confine a hot, dense plasma for a short time. It features C-shaped magnetic coils that form the confining magnetic field. Their unique shape (in what is known as a yin-yang geometry) stabilizes the confined plasma by creating a magnetic field (a magnetic well) that increases in every direction from the plasma center. In 1976, we proposed a new idea: the tandem mirror concept. A tandem mirror reactor would contain a long solenoidal magnet terminated at both ends by conventional mirror cells. These cells would ace as ''end plugs'' to prevent plasma leakage out the ends of the solenoid. The TMX is being constructed to test the principles of this concept. The MFTF now being constructed will bridge the physics and engineering gaps between present experiments and an experimental fusion reactor planned for operation by 1990. The MFTF will use a superconducting magnet of yin-yang design (similar to the 2XIIB experiment). This magnet will be capable of continuous operation