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Momentum injection and repetitive CT operation experiments

Compact torus (CT) injection as a fuelling technology was proposed by Parks (1) and has been identified as the only fuelling technology that is able to directly fuel the core of the magnetic confinement fusion reactors, such as tokamaks (2). CT fuelling has several advantages including flexible control of the fuel deposition location to optimize the density profile that is best for high fraction of bootstrap current and injection of momentum to create and maintain toroidal flow in the reactor when it is injected tangentially along the toroidal direction. Toroidal flow is an important ingredient for suppression of resistive wall mode and avoidance of locked mode which may disrupt the discharge. The first disruption-free CT injection experiment was demonstrated on the TdeV tokamak (3) and followed by the injection experiments on STOR-M which triggered improved confinement (4). This paper will focus on two recent experiments carried out using the University of Saskatchewan Compact Torus Injector (USCTI). The first experiment concerns momentum injection into the STOR-M discharge and the second one is the bench test of the repetitive CT operation up to 10Hz.