Abstract: The invention relates to a method and to a device for producing vacuum tubes for solar thermal installations, wherein the vacuum tube comprises an outer tube and an inner tube arranged within the outer tube, and the gap between the outer tube and the inner tube is sealed with respect to the exterior and evacuated. An outer tube (4) is coated in a first vacuum unit (1) and an inner tube (5) is coated in a second vacuum unit (2). The coated outer tube (4) and the coated inner tube (5) are assembled in a third vacuum unit (3) and fused together at the ends. The third vacuum unit is connected to the first vacuum unit (1) and to the second vacuum unit (2), such that the outer tube (4) and the inner tube (5) are not exposed to the atmosphere throughout the entire production of the vacuum tubes.

Abstract: A device for plasma-assisted coating the inner side of tubular components by a high frequency magnetic field. At least two receiving bodies accommodating a tubular component by the ends, supporting and sealing the inside of the tubular component, an inflatable seal on the receiving body that is arranged about the outer side and/or the front side of a tubular component, the seal sealing the transition between the receiving body and the tubular component in relation to the surroundings, a high frequency circuit for producing a high frequency magnetic field, a coil of the high frequency circuit; the windings being coaxial to the longitudinal axis of said device. The longitudinal axis is a straight line extending through both receiving bodies, and a drive for the coil and/or the receiving body, the drive displacing the coil in relation to the receiving bodies or the receiving body in relation to the coil.