Recent development of hard carbon films formed by discharge decomposition of hydrocarbon gases has been reviewed. The correlation of deposition conditions to film properties and structures are presented, in view of diamond film synthesis and carbon coating of the first wall of fusion devices.
A ceramic coating technology is attracting strong attentions as one of advanced technologies for surface modification, ceramic synthesis, etc.. An application of plasma processes to the ceramic coating technology can strengthen attractive features of the ceramic coating technology by lowering synthesis temperatures, improving properties of synthesized ceramics, and synthesizing ceramics having abnormal structures. This paper is describing some roles of plasma process in ceramic coating technology by taking a titanium carbide coating as an example.
The method to analyze the dynamics of 2D plasma equilibrium was formulated. By this method, we can examine the plasma shape control of the noncircular tokamak. Effective plasma position, ellipticity and current control by the conventional PI control law was obtained in computer simulations for a tokamak with a major radius of 0.4 m which had a hybrid poloidal coil system with 3 pairs of coils.
Multivariate-analysis methods have been applied to plasma-data analyses. Many parameters obtained in plasma experiments are strongly coupled with each other, and are generally difficult to be resolved into simple physics laws. Multivariate-analysis methods are to find simple relations lying in data and to create scaling laws, which we may use, for example, to optimize operation parameters of devices. This paper introduces the factor-analysis method and describes an example of its applications to the REPUTE-1 RFP experiments.
The possibility of producing the H-mode in the limiter discharge of tokamaks is discussed. Except for the large magnetic shear of divertor configurations, the limiters placed vertically appear to mimic the diverted configuration.