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A method to temporally tailor the properties of X-ray radiation carryingOrbital Angular Momentum (OAM) is presented. In simulations, an electron beamis prepared with a temporally modulated micro-bunching structure which, whenradiating at the second harmonic in a helical undulator, generates OAM lightwith a corresponding temporally modulated intensity. This method is shown togenerate attosecond pulse trains of OAM light without the need for anyadditional external optics, making the wavelength range tunable. In addition tothe OAM pulse train, the method can be adapted to generate radiation where thehandedness of the OAM mode may also be temporally modulated (flipped).

X-ray pulse generation with ultra-fast flipping of its orbital angular momentum