Phys. Rev. Lett. 84, 495–498 (2000)H-Mode Operation in the START Spherical TokamakReceived 23 August 1999; published in the issue dated 17 January 2000 H-mode operation has been achieved in high current (Ip>200kA) plasmas in the START spherical tokamak for both neutral-beam-injection-heated and Ohmic discharges. The transition to H mode features the development of well-defined edge pedestals in density and temperature, which signifies the formation of an edge-transport barrier, and associated edge-localized modes. Recent operation at plasma currents exceeding 250 kA shows that these features are accompanied by increases in energy confinement time. This is the first clear demonstration of the H-mode regime in a spherical tokamak. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.495
DOI:
10.1103/PhysRevLett.84.495
PACS:
52.55.Fa
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