In 1991 (R. Jones, Phil J. Sci., vol 120, pg 203) I published computer simulations showing that by controlling recycling at the boundary of the plasma one could obtain flat temperature profiles and enhanced performance. The Princeton plasma lab's LTX device has now produced such plasmas experimentally (D. P. Boyle, et al, Phys. Rev. Lett's.,on line 5 July, 2017).