Abstract
In this paper we present the design of a 50 MeV compact electron storage ring with 4.8-meter circumference for the Tsinghua Thomson scattering x-ray source. The ring consists of four dipole magnets with properly adjusted bending radii and edge angles for both horizontal and vertical focusing, and a pair of quadrupole magnets used to adjust the horizontal damping partition number. We find that the dynamic aperture of compact storage rings depends essentially on the intrinsic nonlinearity of the dipole magnets with small bending radius. Hamiltonian dynamics is found to agree well with results from numerical particle tracking. We develop a self-consistent method to estimate the equilibrium beam parameters in the presence of the intrabeam scattering, synchrotron radiation damping, quantum excitation, and residual gas scattering. We also optimize the rf parameters for achieving a maximum x-ray flux.
Highlights
Inverse Compton scattering (ICS) between high power infrared laser and medium energy electron beams is a promising source of intense tunable x rays for various applications [1,2]
Huang and Ruth proposed a scheme for an ICS x-ray source [4], in which electron beams are stored in a compact ring, while laser pulses are stored in an optical cavity
We find that a 4.8 meter storage ring provides satisfactory beam dynamics for the Thomson scattering x-ray source (TTX), including dynamic aperture, momentum aperture, error analysis, intrabeam scattering, space charge effects, and rf beam dynamics
Summary
Inverse Compton scattering (ICS) between high power infrared laser and medium energy electron beams is a promising source of intense tunable x rays for various applications [1,2]. Huang and Ruth proposed a scheme for an ICS x-ray source [4], in which electron beams are stored in a compact ring, while laser pulses are stored in an optical cavity. The flux of x-ray photons reduces continuously in one storage period as the laser pulse interacts with the continually diffusing electron beam [6]. This mode of operation suffers from the pulse-by-pulse jitter of the linac. A single electron bunch circulates for about one million turns in the ring of CLS before being dumped It succeeds in producing photons over 10 keV by storing about 25 MeV electron beams in the ring [8].
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