Laser blow-off injection of metal impurities in Tore Supra
The results obtained on Tore Supra during the 1992 campaign by means of the laser blow-off impurity injection technique are presented. Ni and Mn puffs are injected in ohmic plasmas and in plasmas heated simultaneously by ion cyclotron resonance heating and lower hybrid radio frequency systems. Using an impurity transport simulation code the radius dependent transport parameters D and V (respectively, diffusion coefficient and inward convection velocity) are determined for both regimes. The simulations show a reduced transport in the central region and a confinement degradation with additional power. Three particular injections are considered in detail, chosen with quite different sawtooth stabilisation periods. Comparison of the experimental values of D and V with the predictions of neo-classical theory is described. The Appendix discusses the regularly updated atomic physics subroutines.
Bibliographic Reference: Report: EUR-CEA-FC-1491 EN (1993) 35 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199311123 / Last updated on: 1994-11-29
Original language: en
Available languages: en