Interfacing Video Capture, Editing and Publication in a Tangible Environment

Abstract. The paper presents a novel approach to collecting, editing and performing visual and sound clips in real time. The cumbersome process of capturing and editing becomes fluid in the improvisation of a story, and accessible as a way to create a final movie. It is shown how a graphical interface created for video production informs the design of a tangible environment that provides a spontaneous and collaborative approach to video creation, selection and sequencing. Iterative design process, participatory design sessions and workshop observations with 10-12 year old users from Sweden and Ireland are discussed. The limitations of interfacing video capture, editing and publication in a self-contained platform are addressed

Physics Study of EC-Excited Current Generation via Current Jump in the Compact Plasma-Wall-Interaction Experimental Device

"Non-inductive current start-up experiments by using electron cyclotron heating and current drive (ECH/ECCD) technique has been conducted in the Compact Plasma-wall-interaction experimental Device (CPD), which is a small spherical tokamak device. By applying 8.2 GHz RF under steady external fields, plasma currents are generated and closed flux surface configurations are formed spontaneously. Two discharge modes are found. The first one is the “current jump” discharge, in which the closed flux configuration is formed via the rapid increase of the plasma current under relatively high vertical magnetic field. The second one is a slow current increase discharge under lower vertical field, in which the closed flux surfaces are formed during a slow current increase with the slow increase of microwave power. Since the higher plasma currents under higher vertical fields can be obtained only via the current jumps, the current jump phenomena seems to be essential for the non-inductive start-up scenario based on ECH/ECCD technique. By comparing the co-directional O-mode injection and the normal X-mode injection in the current jump discharges, the current jump occurred at lower RF power in the co-directional O-mode than that in the normal X-mode. However, the values of plasma current just before and after current jumps did not depend on the injection mode.