Stellarator

The stellarator is a figure-8 shaped device designed to confine hot hydrogen using a magnetic field to allow controlled nuclear fusion as a source of peaceful energy. This invention aimed to harness the vast energy of nuclear fusion, which far exceeds that of fission. It was not successful.
 Lyman Spitzer, Jr. United States 1951 Stellarator

The stellarator is a figure-8 shaped device designed to confine hot hydrogen using a magnetic field to allow controlled nuclear fusion as a source of peaceful energy. This invention aimed to harness the vast energy of nuclear fusion, which far exceeds that of fission. It was not successful.