The stellatron accelerator

A stellatron is a high current accelerator concept which combines the magnetic field configuration of a stellarator and a betatron. Such a oonfiguration can be designed by adding a ℓ=2 stellarator winding to a betatron accelerator. The stellarator field provides a twisted quadrupole configuration which is analogous to an alternategradient, strong-focusing systeme This oonfiquration can easily tolerate a mismatch between the average particle energy and the vertical maqnetic field of 50% at injection, with multi-kiloamp electron beams. The allowed energy mismatch of a conventional or rrodified betatron is typically 2 to 3%. There is a family of potentially interesting high current accelerators which consist of a betatron augmented by stellarator fields of various ℓ-number. we will present a comparison of energy bandwidth for various ℓ-number stellatron oonfigurations.