A team of fusion researchers succeeded in proving that energetic ions with energy in mega electron volt (MeV) range are superiorly confined in a plasma for the first time in helical systems. This promises the alpha particle (helium ion) confinement required for realizing fusion energy in a helical reactor.
source https://www.lifetechnology.com/blogs/life-technology-news-blog/demonstration-of-alpha-particle-confinement-capability-in-helical-fusion-plasmas