Fig. 1: Time traces of discharges with improved performances during boron powder injection.
From: Observation of a reduced-turbulence regime with boron powder injection in a stellarator
a–d, From top to bottom: line-averaged density ne,av; input power Pin separated by different sources: ion and electron cyclotron resonant heating (ICH, ECH), tangential neutral beam (NB) and perpendicular diagnostic beam (pNB); electron (solid) and ion (dotted) temperature Te and Ti; stored energy Wp; injected boron mass rate (dotted, left axis) and BV spectroscopic line (solid, right axis). Red colour for shots with B powder injection, blue for reference shots (no powder). Main plasma ion is D for a and b and H for c and d. The magnetic field direction for d is reversed with respect to a–c.
