Power transmission of the neutral beam heating beams at TJ-II

Fuentes, C.; Liniers, M.; Guasp, J.; Botija, J.; Doncel, J.; Sarasola, Xabier; Wolfers, G.; Alonso, Javier; Carrasco, R. C.; Marcon, Gianluca; Acedo, M.; Sánchez, E.; Weber, M.; Medrano, M.; Soleto, A.; Tera, J.; Ćirić, D.

doi:10.1016/j.fusengdes.2007.07.054

Cited by 6 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Global energy confinement times were obtained from the diamagnetic loop diagnostic after correction for the plasma current [19]. Total injected powers by the NBI system were measured by calorimetry and corrected by shine-through and ion losses effects [20,24]. Total radiated power was determined from absolutely calibrated bolometer arrays located at several toroidal and poloidal locations [21].…”

Section: Energy Confinementmentioning

confidence: 99%

Plasma performance and confinement in the TJ-II stellarator with lithium-coated walls

Tabarés

Ochando²,

Medina³

et al. 2008

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

In the last campaign, the TJ-II heliac has been operated under lithium-coated walls, representing the first stellarator ever working under these boundary conditions. Enhanced density control and discharge reproducibility, leading to the drastic enlargement of the operational window, have been obtained. A strong decrease in recycling together with changes in the shot by shot fuelling characteristics and in the wall particle inventory have been recorded. These changes, associated with the new wall scenario, had led to a long-lasting good density control. The new conditions were also mirrored in the plasma profiles under NBI heating scenarios with increased peaking of the electron density profiles. Fuelling rates corresponding just to the nominal beam current were obtained for the first time, and transitions from bell to dome-type plasma profiles, with different collapsing limits, were observed and tentatively ascribed to changes in the local edge power balance. ELM-type activity was observed in concomitance to reduced fluctuation levels and confinement improvement. Record values of plasma energy content were measured at central densities up to 8 × 10 19 m −3 under Li-coated walls.

show abstract