Abstract
As the development of nuclear physics and atomic sciences progresses, monochromatic and high-flux gamma-ray light sources are highly demanded by many experiments in these fields. We have designed a compact storage ring for gamma-ray source generation based on the Compton backscattering technique. The energy range of the electron beam stored in the ring will be from 500 to 800 MeV, with the capability of generating a gamma ray with an energy range from about 4 to 10 MeV. The maximum energy loss for an electron could be more than 1% for one scattering event, which could have a significant impact on electron beam dynamics. To study this impact, a 6D macroparticle tracking code has been developed by including the Compton scattering, damping, quantum excitation, and synchrotron radiation in the storage ring. The equilibrium states have been studied with this code, and the results show good agreement with theoretical predictions. The electron beam loss rate induced by Compton scattering has also been investigated by varying the input laser beam parameters. This study allows us to optimize the storage ring operation for a stable, high-flux, and narrow-bandwidth gamma-ray beam generation.
Highlights
III, we briefly summarize the formula proposed by Chaikovska [32] to evaluate the equilibrium energy spread and emittance of an electron beam for the storage ring aiming to generate an x- or gamma-ray source based on the Compton backscattering (CBS) technique
ΔEcomp ≪ ΔESR (ΔESR 1⁄4 2.89 keV, ΔEcomp is ∼eV to tens of eV varying with the luminosity), while σcomp ≫ σSR, a rough estimation for the equilibrium energy sppreffiaffiffidffiffiffiffiffiffioffiffifffiffiffiffiffitffihffiffiffieffiffiffiffiffieffiffilffiffieffifficffiffitron beam can be simplified to σE ∼ C þ A Ã Elaser=λL, where C is related to storage ring parameters, A is related to electron parameters and the rms size of the laser, and Elaser is the energy of one laser pulse
A parallel 6D particle tracking code based on the TRACY library with flexible settings for laser or electron parameters and the location of the interaction point has been developed by taking into account all of the effects associated with beam dynamics in terms of damping, quantum excitation, synchrotron radiation, and Compton scattering
Summary
With excellent properties in terms of high flux, monochromaticity, high brightness, and high repetition rate but requiring only relatively moderate electron beam energy, the x- and gamma-ray sources produced from Compton backscattering (CBS) have broad applications in the fields of phase contrast imaging [1,2], medical science [3,4], and nondestructive detection [5]. Huang and Ruth proposed a compact laser-electron storage ring for electron beam cooling or x-ray generation [6] in 1998 based on the Compton backscattering technique [7,8,9,10,11,12,13,14]. Many pioneering works in gamma-ray generation based on CBS have been carried out at Duke University, NewSUBARU, and Extreme Light Infrastructure— Nuclear Physics (ELI-NP) [20,21,22]. Many experimental activities and dynamic investigations have been completed [27,28,29,30,31] in those facilities, so far there is no dedicated storage ring for gamma-ray generation based on the CBS technique
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