MIRRORCLE generates brilliant far‐infrared, extreme ultraviolet, and hard X‐ray beams in a body of tabletop electron storage ring (ESR). In this paper, we report the most recent development of the 4‐ and 1‐MeV, 8‐cm orbit radius ESR. X‐rays are generated in Bremsstrahlung mechanism by a micron‐order ball shape target placed in the ESR electron orbit. Nature of the source is different from either X‐ray tubes or synchrotron light sources (SLS). MIRRORCLE generates high‐density photons such as SLS, but the emitter size is much smaller than that. The X‐ray angular distribution is 1/γ determined by the normalized electron energy γ, thus is much wider than of SLS with the MeV electrons. The energy spectrum is polychromatic like SLS but continues up to MeV range. MIRRORCLE has advantages in magnified phase contrast X‐ray 2D and 3D imaging for light as well as heavy materials. It has an advantage in fluorescent analysis of micron‐sized objects because focus size is in microns. It is advanced in an ultrasmall‐angle scattering experiment by its micron‐order focus point. Extended X‐ray absorption fine structure is carried out in an energy dispersive mode because of the white spectrum and the wide angular spread of radiation. Copyright © 2012 John Wiley & Sons, Ltd.