Fig. 6: Energy transport reduction and confinement improvement.
From: Observation of a reduced-turbulence regime with boron powder injection in a stellarator
a,b, Radial profiles of heat conductivities for ions χi (a) and electrons χe (b) as a function of the normalized effective minor radius reff/a99, comparing a discharge with powder injection (red) with a reference discharge (blue). Shaded areas represent an estimated average relative error of 20% on the DYTRANS analysis results, obtained by comparing different time frames of the simulation. c, Measured energy confinement time τE during B powder injection (red squares) and for the reference shots at the same time (blue diamonds). The experimental τE is plotted against the predicted energy confinement time from the international stellarator scaling TE,ISS04 (ref. 26). Error bars represent standard deviation in time over a window of 200 ms.
