Fig. 3: Real-time wall conditioning and profile modification.
From: Observation of a reduced-turbulence regime with boron powder injection in a stellarator
a,b, Time evolution of difference of normalized gradient between a powder injection shot (#166,256) and its reference (#166,254) for electron density (a) and temperature (b). c, Peak value of divertor density measured by Langmuir probes (black, left axis) and Hα radiation (red, right axis). d, Evolution of intensity of UV radiation normalized to the electron density IUV/ne for spectroscopic lines CVI (red), FeXVI (blue) and BV (black). e, Average value of the density fluctuation amplitude measured by phase-contrast imaging 〈δn〉ρ. Solid lines are for the powder injection shot #166,256 and dotted lines are for the reference #166,254. Periodic oscillations at 3.33 Hz are due to the pulsed operation of the diagnostic neutral beam.
