Improvement of energy confinement time by continuous pellet fuelling in beam-heated Doublet III limiter discharges
- 1 October 1985
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 25 (10) , 1475-1480
- https://doi.org/10.1088/0029-5515/25/10/010
Abstract
A centrifuge injector that repetitively fires 1.3 mm deuterium pellets (1 torr⋅L per pellet) at a rate of 32 pellets per second was used to build up and maintain a Doublet III 2.4 MW neutral-beam-heated limiter discharge at a line-averaged density of 1 × 1014 cm−3. When compared to a conventional gas-fuelled plasma at similar density, the pellet-fuelled plasma was characterized by a factor-of-three reduction in edge neutral density and limiter recycling, a centrally peaked profile, a 70% increase in global energy confinement, and a tenfold increase in the fusion reaction rate.Keywords
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