Abstract: In a rotor (1) for thermal turbomachines, in particular a compressor part (2), center part (3) and turbine part (4) arranged on one shaft, the rotor (1) mainly consisting of individual rotary bodies welded to one another, the geometrical form of which leads to the formation of axially symmetrical hollow spaces (5) between the respectively adjacent rotary bodies, there are provided a further, cylindrical hollow space (7) extending around the center axis (6) of the rotor (1) and reaching from the downstream end of the rotor (1) up to the last hollow space (5h) upstream and at least two tubes (8, 9) having different diameters and lengths from one another, which tubes (8, 9) overlap at least partly and are placed in the cylindrical hollow space (7), in which arrangement the tubes (8, 9) are each firmly anchored to at least one fixed point and the fixed points of the tubes (8, 9) lie at axially different locations.