TJ-II Results from Helical Axis Stellarators - ICPP 2000 TJ-II Heliac, CIEMAT, Spain R = 1.5 m, a < 0.22 m, 4 periods B 0 < 1.2 T P ECRH < 600 kW from.

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Presentation transcript:

TJ-II Results from Helical Axis Stellarators - ICPP 2000 TJ-II Heliac, CIEMAT, Spain R = 1.5 m, a < 0.22 m, 4 periods B 0 < 1.2 T P ECRH < 600 kW from 2 ECH systems P NBI < 3 MW under installation helium and hydrogen plasma T e ~ 2keV, low radiated powers (<20%) wall desorption rate limits operation in He at P< 600 kW Helical/central conductor

TJ-II Results from Helical Axis Stellarators - ICPP 2000 Configuration Scan (iota) iota ~ 1.28 – 2.24, up to 1.2 x m -3 and 2.0 keV Iota = 2 When corrected for volume changes, a positive dependence on iota is revealed in helium, (less in H) (tendency sim. to ISS95)

TJ-II Results from Helical Axis Stellarators - ICPP 2000 Thomson scattering Helium plasmas with injected power of 300 kW Internal transport barrier at low density, iota~1.51 (ECE also) Inferred positive ambipolar E, confinement time ~ 5ms ~ ISS95

TJ-II Results from Helical Axis Stellarators - ICPP 2000 Turbulence/Fluctuation studies ExB sheared flows observed near edge rational surfaces (8/5, 4/2) Spectra mainly <200kHz, 10-40% (edge?), correlation time 10ms Fluctuations increase with magnetic hill near edge MHD (ELM-like) events - magnetic activity - spike in the H  signal.