Influence of the electric and magnetic shears on tokamak transport

Autor(es)

Rosalem, K. C. ^[1] ; Roberto, M. ^[1] ; Caldas, I. L. ^[2]

Afiliação do(s) autor(es)

^[1] Inst Tecnol & Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NUCLEAR FUSION; v. 54, n. 6 JUN 2014.
• Citações Web of Science: 3

Resumo

We applied a non-integrable drift-kinetic model, valid for large aspect ratio tokamaks, to investigate plasma edge particle transport driven by drift waves. Particle transport is obtained from the chaotic trajectories obtained by numerically integrating the canonical equations of motion, for the total flow formed by the equilibrium sheared flow and few dominant resonant drift waves propagating in the sheared equilibrium magnetic field. Thus, we investigate the transport dependence on the radial profiles of the electric and magnetic fields and show that radial particle transport at the plasma edge can be reduced by properly modifying the electric and magnetic shear profiles. For non-monotonic radial electric fields, we also observe non-twist transport barriers with shearless invariants identified by extremum values of the rotation number profiles of the invariant curves. The observed non-twist barriers are modified by the magnetic shear and persist for magnetic shear variations expected in present tokamaks. (AU)

• Processo FAPESP: 11/19296-1 - Dinâmica não linear
• Beneficiário: Iberê Luiz Caldas
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/03401-6 - Transporte de linhas de campo magnético e de partículas em tokamaks e modelagem de plasmas para estudo de deposição e corrosão
• Beneficiário: Marisa Roberto
• Linha de fomento: Auxílio à Pesquisa - Regular