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Steady-state, fully bootstrap-sustained discharges in the TCV tokamak

Steady-state, fully bootstrap-sustained discharges in the TCV tokamak. with O. Sauter, M.A. Henderson, T.P. Goodman and the TCV team. Centre de Recherches en Physique des Plasmas. EPFL, Association Euratom-F é d é ration Suisse, Lausanne, Switzerland. S. Coda. The steady-state tokamak.

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Steady-state, fully bootstrap-sustained discharges in the TCV tokamak

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  1. Steady-state, fully bootstrap-sustained discharges in the TCV tokamak with O. Sauter, M.A. Henderson, T.P. Goodmanand the TCV team Centre de Recherches en Physique des Plasmas EPFL, Association Euratom-Fédération Suisse, Lausanne,Switzerland S. Coda S. Coda, MHD workshop, PPPL, 22 Nov. 2004

  2. The steady-state tokamak • inductive operation is always pulsed inherently limiting for a reactor • “advanced tokamak” alternative: • external non-inductive current drive (difficult!) • tailor current profiles to create low-transport core (possibly transport barrier)  steep gradients  high bootstrap S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  3. j p jbs r=1 r=0 Bootstrap alignment can do away with external current drive altogether? need exact alignment • necessary for high bootstrap fraction • appears good (several AT experiments) S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  4. j p jbs Bootstrap alignment can do away with external current drive altogether? need exact alignment and stable equilibrium r=1 r=0 S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  5. j p jbs Bootstrap alignment steady state = stable aligned state r=1 r=0 S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  6. TCV 3.0 MW X2 ECRH power, 6 steerable launchers R = 0.88 m, a = 0.25 m Ip < 1 MA, BT < 1.54 T S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  7. 100% bootstrap with balanced co- and counter-ECCD Beams matched locally for zero nominal ECCD Pre-existing steady-state reversed shear and eITB S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  8. bootstrap overdrive 100% bootstrap with balanced co- and counter-ECCD non-inductive no net ECCD S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  9. 100% bootstrap without ECCD: ramp-up eITB evolves to steady state S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  10. Equilibrium state: narrow barrier H factor ~4-6 H factor ~2.5-3 S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  11. Equilibrium state:negative central shear S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  12. Steady state found at different powers S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  13. Spontaneous bootstrap overdrive Current ramp-up with no external sources S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  14. MHD survival: avoid Ip<0 injection S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  15. Conclusions and outlook • achieved steady-state discharges with fully self-sustained plasma current • stable and quiescent bootstrap current alignmentrequires a narrow ITB • systematic exploration of parameter space (especially density, power) remains to be performed S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

  16. Bootstrap current density jbs S. Coda, 34th EPS Conf. on Plasma Physics, Warsaw, 5 July 2007

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