Abstract
In tokamaks a radiation from impurities (light and metal elements) is a large and direct energy loss from a plasma. In order to find methods of control and reduction of impurities, species, quantity, transport and source of an impurity have been investigated by time-and space-resolved spectroscopic measurements of emission from intrinsic and tracer impurities. In this report, recent topics of an impurity transport study. a Doppler ion temperature measurement in tokamak plasmas and a study of atomic and molecular data by using a tracer impurity are summarized.
