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Sökning: WFRF:(Hawkes N. C.) > Konferensbidrag

  • Resultat 1-10 av 15
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1.
  • Hobirk, J., et al. (författare)
  • Improved confinement in JET hybrid discharges
  • 2009
  • Ingår i: 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts. - 9781622763368 ; , s. 150-153
  • Konferensbidrag (refereegranskat)
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  • Challis, C. D., et al. (författare)
  • High βN JET H-modes for steady-state application
  • 2007
  • Ingår i: 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts. - : European Physical Society. - 9781622763344 ; , s. 2118-2121
  • Konferensbidrag (refereegranskat)
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  • Conway, N. J., et al. (författare)
  • The MAST motional Stark effect diagnostic
  • 2010
  • Ingår i: REVIEW OF SCIENTIFIC INSTRUMENTS. - Melville, NY : AMER INST PHYSICS. - 1089-7623. ; , s. 10D738-
  • Konferensbidrag (refereegranskat)abstract
    • A motional Stark effect (MSE) diagnostic is now installed and operating routinely on the MAST spherical tokamak, with 35 radial channels, spatial resolution of similar to 2.5 cm, and time resolution of similar to 1 ms at angular noise levels of similar to 0.5 degrees. Conventional (albeit very narrow) interference filters isolate pi or sigma polarized emission. Avalanche photodiode detectors with digital phase-sensitive detection measure the harmonics of a pair of photoelastic modulators operating at 20 and 23 kHz, and thus the polarization state. The pi component is observed to be significantly stronger than sigma, in reasonably good agreement with atomic physics calculations, and as a result, almost all channels are now operated on pi. Trials with a wide filter that admits the entire Stark pattern (relying on the net polarization of the emission) have demonstrated performance almost as good as the conventional channels. MSE-constrained equilibrium reconstructions can readily be produced between pulses.
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  • Hawkes, N. C., et al. (författare)
  • Ion transport barrier formation with low injected torque in JET
  • 2007
  • Ingår i: 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts. - 9781622763344 ; , s. 504-507
  • Konferensbidrag (refereegranskat)abstract
    • Ion temperature ITB trigger events have been provoked on JET with very low levels of injected torque using a 3He minority ion heating scheme. The evidence indicates that E x B shear driven by toroidal rotation is not important in these ITB triggers, however the ITBs which form are weak and short lived. Evidence from other experiments [4], suggests that higher torque is necessary to establish and maintain strong ITBs. Future experiments with the increased RF power of the new JET ICRH antenna will be made to explore whether 'strong' ITBs can be created at high power and low applied torque.
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  • Resultat 1-10 av 15

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