Feasibility of application of impurity pellets to diagnoses in ITER

New design details for the International Thermonuclear Experimental Reactor, ITER-FEAT, have been completed. The α particle diagnostics is one of the key issues for controlling the operation of fusion reactor. Based on the two dimensional kinetic ablation theory of hydrogenic pellet developed by Kuteev, a new algorithm for erosion speed and ablation rate calculations of the impurity pellets in reactor-relevant-plasma has been derived. Preliminary exploration for the feasibility of application of impurity pellet injection to the α particle diagnostics in future ITER device has been performed. Comparisons and analysis of the numerical integral calculation results show that the lithium pellet injection possesses much more compatibilities. It might be feasible to apply this technique to both α particle diagnosis and safety factor q(r) profile measurement in the future ITER device. (authors)