Device (10) for generating a plasma jet (P), comprising a first conduit (1 1 ), which comprises a first outlet (13), and a second conduit (12), which comprises at least one second outlet (14), wherein the first conduit (1 1 ) is arranged inside the second conduit (12), such that a first flow channel (15) is provided inside the first conduit (1 1 ), and a second flow channel (16) is provided in the space between the first conduit (1 1 ) and the second conduit (12), and wherein the device (10) comprises a first
electrode (17) and a second electrode (18) for generating an electric field in a feed gas flow (F) provided in the first flow channel (15) in order to generate a plasma jet (P) from the feed gas flow (F), wherein the device (10) is adapted to provide a curtain gas flow (C) at the second outlet (14) surrounding the plasma jet (P) emerging from the first outlet (13), wherein the first electrode (17) is positioned radially outside of the first flow channel (15),
characterized in that
the radial distance of the second electrode (18) from a longitudinal axis (I) of the first conduit (1 1 ) is larger than the radial distance of the first electrode (17) from said longitudinal axis (I).
Device (10) for generating a plasma jet (P) according to claim 1 , characterized in that the first electrode (17) is positioned between the first flow channel (15) and the second flow channel (16).
Device (10) for generating a plasma jet (P) according to claim 1 or 2, characterized in that the second outlet (14) is arranged coaxially around the first outlet (13).
Device (10) for generating a plasma jet (P) according to one of the claims 1 to 3, characterized in that at least a part of the second conduit (12) comprises a flexible section (19), wherein the bending stiffness of the flexible section (19) is such that the flexible section (19) can be bent by a bending radius in the range of 10 mm to 100 mm.
Device (10) for generating a plasma jet (P) according to one of the claims 1 to 4, characterized in that the maximum radial extension of the second conduit (12) is 10 mm or less, particularly 4 mm or less.
Device (10) for generating a plasma jet (P) according to one of the claims 1 to 5, characterized in that a. the first electrode (17) is arranged at a distance from the first outlet (13), wherein the distance equals at least the maximum radial extension of the first conduit (1 1 ), and/ or b. an electrically insulating material (20) is positioned between the first electrode (17) and the first outlet (13).
