Method for generating a CO2 snow jet, wherein liquid CO2 is fed into an expansion channel via an inlet opening, wherein the liquid CO2 is expanded in the expansion channel such that the liquid CO2 is at least partially converted into a CO2 gas/CO2 snow mixture, wherein the CO2 gas/CO2 snow mixture is discharged from an outlet opening of the expansion channel, wherein, in order to generate a sheath jet, which surrounds the CO2 gas/CO2 snow mixture discharged from the outlet opening of the expansion channel in a circumferential direction and accelerates said mixture in a jet direction, a carrier gas is fed into a sheath jet nozzle which, preferably concentrically, surrounds the expansion channel, wherein, in order to generate a pulsating CO2 snow jet, a CO2 valve unit, which selectively unblocks or blocks the supply of the liquid CO2 into the expansion channel, is periodically opened for an opening duration and closed for a closing duration, and wherein the opening duration and/or the closing duration are selected separately from one another and the opening duration and the closing duration are then used to control the CO2 valve unit, characterized in that a carrier gas valve unit which selectively unblocks or blocks the supply of the carrier gas into the sheath jet nozzle is periodically opened for an opening duration and closed for a closing duration, and in that the opening duration and/or the closing duration are selected separately from one another and the opening duration and the closing duration are then used to control the carrier gas valve unit, and in that the opening duration or the closing duration of the CO2 valve unit and the opening duration or the closing duration of the carrier gas valve unit are selected such that the opening duration or the closing duration of the CO2 valve unit is the same length as the opening duration or the closing duration of the carrier gas valve unit, respectively, and in that the opening or closing of the CO2 valve unit and the opening or closing of the carrier gas valve unit take place by opening or closing a common valve unit, respectively. wherein liquid CO2 is fed into an expansion channel via an inlet opening, wherein the liquid CO2 is expanded in the expansion channel such that the liquid CO2 is at least partially converted into a CO2 gas/CO2 snow mixture, wherein the CO2 gas/CO2 snow mixture is discharged from an outlet opening of the expansion channel, wherein, in order to generate a sheath jet, which surrounds the CO2 gas/CO2 snow mixture discharged from the outlet opening of the expansion channel in a circumferential direction and accelerates said mixture in a jet direction, a carrier gas is fed into a sheath jet nozzle which, preferably concentrically, surrounds the expansion channel, wherein, in order to generate a pulsating CO2 snow jet, a CO2 valve unit, which selectively unblocks or blocks the supply of the liquid CO2 into the expansion channel, is periodically opened for an opening duration and closed for a closing duration, and wherein the opening duration and/or the closing duration are selected separately from one another and the opening duration and the closing duration are then used to control the CO2 valve unit, characterized in that a carrier gas valve unit which selectively unblocks or blocks the supply of the carrier gas into the sheath jet nozzle is periodically opened for an opening duration and closed for a closing duration, and in that the opening duration and/or the closing duration are selected separately from one another and the opening duration and the closing duration are then used to control the carrier gas valve unit, and in that the opening duration or the closing duration of the CO2 valve unit and the opening duration or the closing duration of the carrier gas valve unit are selected such that the opening duration or the closing duration of the CO2 valve unit is the same length as the opening duration or the closing duration of the carrier gas valve unit, respectively, and in that the opening or closing of the CO2 valve unit and the opening or closing of the carrier gas valve unit take place by opening or closing a common valve unit, respectively.