Credit: Images courtesy of M. Fenstermacher, Lawrence Livermore National Lab (left), and General Atomics (right).
Caption: Left: 2-D carbon radiation contour showing radiation detached from wall surfaces. Right: plasma shape and pressure contour; radial pressure profile in cyan with internal transport barrier (ITB) and edge transport barrier (ETB) labels.
Creating an efficient fusion plasma in a tokamak requires balancing the plasma’s competing temperature needs. It must be extremely hot in the core to allow fusion to occur, but cool enough at the edge to not damage the walls of the device. An international research team at the DIII-D National Fusion Facility has developed an innovative solution. It uses the active injection of gases to cool the edge region of a plasma coupled with enhanced core confinement from an internal tra...