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In this paper, an atmospheric plasma jet with long flame has been developed. The plasma jet is covered with a cylindrical glass container, where the inner volume is purged by the working gas. The flame of N2 plasma jet has been elongated to about 200 mm, while the conventional plasma jet has a flame of only 10-20-mm length. It has been confirmed that the long-flame plasma jet can modify polymer film with a work distance of over 200 mm. This plasma-jet device could be applicable for treating and cleaning objects having deep channels or large structures and could be used in the wider application fields.