# H-Mode Operation in the START Spherical Tokamak

## H-Mode Operation in the START Spherical Tokamak

H-Mode Operation in the START Spherical Tokamak 150 150 Mathew

# H-Mode Operation in the START Spherical Tokamak

H -mode operation has been achieved in high current I p . 200 kA 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.

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Published date:
17/01/2000