Abstract: The present disclosure relates to a rotor for a gas turbine having a plurality of rotor disks arranged one behind the other in a rotor axis and connected to one another, where the geometrical form of the disks leads to the formation of cavities between adjacent disks. The rotor extends from a compressor part to a turbine part and has a central part between the compressor part and the turbine part, wherein the first turbine disk, the last compressor disk and the central part enclose a central cavity. A cooling system extends at least partially through the rotor with a central cooling section disposed between at least one inlet pipe and at least one outlet pipe, at least partially through the first turbine disk and/or the last compressor disk.