Figure 4: Spontaneous transition during long-lived FRCs with NBI.
From: Achieving a long-lived high-beta plasma state by energetic beam injection
The time traces of a series of discharges with and without transition. Data shown are the excluded flux radius, rΔφ, the line averaged electron density, 
, at the midplane of FRC, z=0, the radiated power at z=±1 m from the midplane, Prad,end, and the length of FRC, 
. Yellow shading indicates the time when the transition occurs for shots 24014, 24049 and 24076. (The lowest limit for the line-integrated density measurement is 0.3 × 1019 m−2, and the absolute responsivity of bolometers varies between −30 and +50%, dependent on the photon energy.)
