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A method to achieve High-Brightness Self-Amplified Spontaneous Emission(HB-SASE) in the Free Electron Laser (FEL) is described. The method usesrepeated non-equal electron beam delays to de-localise the collective FELinteraction and break the radiation coherence length dependence on the FELcooperation length. The method requires no external seeding or photon opticsand so is applicable at any wavelength or repetition rate. It is demonstratedusing linear theory and numerical simulations that the radiation coherencelength can be increased by approximately two orders of magnitude over SASE witha corresponding increase in spectral brightness. Examples are shown of HB-SASEgenerating transform-limited FEL pulses in the soft X-ray and neartransform-limited pulses in the hard X-ray. Such pulses may greatly benefitexisting applications and may also open up new areas of scientific research.

Transform-Limited X-Ray Pulse Generation from a High Brightness Self-Amplified Spontaneous Emission Free-Electron Laser