Challenges for Beams in an ERL Extension to CESR

Challenges for Beams in an ERL Extension to CESR,G. H. Hoffstaetter,I. V. Bazarov,S. A. Belomestnykh,D. H. Bilderback,M. G. Billing,G. W. Codner,J. A.

Challenges for Beams in an ERL Extension to CESR   (Citations: 3)
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G. H. Hoffstaetter, I. V. Bazarov, S. A. Belomestnykh, D. H. Bilderback, M. G. Billing, G. W. Codner, J. A. Crittenden, B. M. Dunham, M. P. Ehrlichman, K. D. Finkelstein, M. J. Forster, S. Greenwald
Cornell University is planning to build an Energy- Recovery Linac (ERL) X-ray facility. In this ERL de- sign, a 5 GeV superconducting linear accelerator extends the CESR ring. Currently CESR is used for the Cornell High Energy Synchrotron Source (CHESS). The very small electron-beam emittances would produce an x-ray source that is signicantly better than any existing storage-ring light source. However, providing, preserving, and deceler- ating a beam with such small emittances has many issues. We describe our considerations for challenges such as op- tics, space charge, dark current, coupler kick, ion accumu- lation, electron cloud, intra beam scattering, gas scattering, radiation shielding, wake elds including the CSR wake, and beam stabilization. existing CESR storage ring, and it is planned to reuse much of the equipment in CESR. The spectral brightness of x-ray ERL light sources can be larger than that of ring-based light sources because each bunch experiences radiative emittance growth for one pass, and not for many hundreds of turn as in a storage ring. Fur- thermore the electron beam's energy spread can be smaller in an ERL, so that undulators with more poles can be used, and the optics can be very e xible, because in a one pass accelerator nonlinear resonances are generally not impor- tant. However, ERLs have some specic beam dynamics problems, most of which are associated with the deceler- ation of particles. This deceleration is needed to recover the beam energy and to use it for the acceleration of new particles. But any energy deviation produced at high en- ergy, for example by scattering, increases strongly relative the be beam's energy, and transverse oscillation amplitudes are anti-damped by the square root of the deceleration ra- tio. Here we present the status of Cornell's approach to beam-dynamics issues of x-ray ERLs.
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