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Improvement of energy confinement time by continuous pellet fuelling in beam-heated Doublet III limiter discharges

1985; IOP Publishing; Volume: 25; Issue: 10 Linguagem: Inglês

10.1088/0029-5515/25/10/010

1741-4326

S. Sengoku, M. Nagami, Mitsushi Abe, K. Hoshino, A. Kameari, A. Kitsunezaki, S. Konoshima, T. Matoba, Akira Oikawa, M. Shimada, Norio Suzuki, H. Takahashi, K. Tani, Masao Washizu, C.A. Foster, S. L. Milora, S.E. Attenberger, R. E. Stockdale,

Particle accelerators and beam dynamics

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.