An excellent quantity that indicates progress on fusion and how far designs are from breakeven is the triple product. Here is an EXCELLENT review of fusion prog

An excellent quantity that indicates progress on fusion and how far designs are from breakeven is the triple product. Here is an EXCELLENT review of fusion progress so far. (https://www.fusionenergybase.com/article/measuring-progress-in-fusion-energy-the-triple-product/ https://www.fusionenergybase.com/article/measuring-progress-...)