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This paper presents a modified reverse tapering method to generate a polarized soft x ray in x-ray freeelectron lasers (XFELs) with a higher photon power and a shorter undulator length than the simple linear reverse tapering method. In the proposed method, a few untapered planar undulators are added before the simple linear reverse tapering section of the undulator line. This simple modification prevents the frequency shift of the radiation that occurs when the simple linear reverse taperingdoi:10.1103/physrevaccelbeams.20.030703 fatcat:wlg7behpvrhadkpy54vd5zogk4