The invention relates to a travelling wave tube with a cylindrical vacuum sleeve (4), surrounding a delay line, which is closely surrounded by a permanent magnet system (1, 2), consisting of annular pole discs (1) and magnet rings (2) which are arranged in each case between the pole discs (1) and are polarised alternately in the opposite sense in the axial direction, the permanent magnet system (1, 2) being inserted in a positively locking manner in an outer sleeve (6). It is intended to produce a means of securing the position of the focusing elements in this travelling wave tube which is resistant to temperature shocks. To this end, the invention provides that the permanent magnet system (1, 2) is bonded on its external jacket surface and that the bonding (3) consists of a mixture of an epoxy resin with adhesive properties and randomly positioned glass fibres provided therein. The travelling wave tube according to the invention is used in the case of extreme temperature fluctuations, particularly in the region from -60 DEG C to +95 DEG C. IMAGE
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