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Soft x-ray calibration for the NeXT x-ray telescope

We present a plan on soft X-ray calibration for the New Exploration X-ray Telescope (NeXT). Two hard and two soft X-ray telescopes (HXTs/SXTs: see Ogasaka et al. 2008 in this volume) provide images up to 80 keV with a large effective area. Following to the Suzaku X-ray telescope, the mirrors on SXTs are tightly nested to maximize the aperture efficiency. To illuminate the mirrors at all, we plan to adopt a raster scan system using a pencil beam collimated from an X-ray generator. We summarize a current status of the soft X-ray ground calibration system at ISAS/JAXA. We also review the calibration of the Suzaku XRTs since the optics are very similar to the NeXT SXTs.