Toroidal cartography of the high-m magnetic islands in tokamak plasma

A toroidally viewing soft x-ray imaging system and an orthogonal matrix arr ay of soft x-ray diodes are designed for identification of the small-scale plasma perturbations in the T-10 tokamak. Numerical modeling of the helical perturbations with high longitudinal wave numbers (m=5-30) is used for spe cification of the basic design of the system (optimal position of the diagn ostic, field of view, and spatial and mode resolutions) in the T-10 tokamak . A system of external windings is designed for controllable excitation of the low-m magnetic islands and for studies of their effect on small-scale m odes. (C) 1999 American Institute of Physics. [S0034-6748(99)62101-3].