Abstract
A novel magnetic spectrometer for Inverse-Compton X-ray source is proposed. Compton recoil electrons are generated by a lithium converter, and then confined by a complex collimator and spectrally resolved by a sector-shaped double-focusing magnet. A method of optimization for the converter is investigated, and the dependence of the best energy resolution on converting efficiency is quantitatively revealed. The configuration of the magnet is specially designed to cover a wide range of electron energy and to achieve a large collecting solid angle. The efficiency and relative energy resolution of the designed spectrometer, according to Monte-Carlo simulation using Geant4, are 10-4 e/p and about 5% respectively for 3 MeV photons.
Highlights
Inverse-Compton or Thomson scattering[1] is widely investigated to generate high-brightness and quasi-monochromatic X-rays in the MeV region thanks to the advent of high-intensity laser
It is an important supplement to the light sources which opens the era of nuclear photonics.[2]
The energy spectrum of the X-rays should be measured to facilitate the development of light sources and scientific application
Summary
Inverse-Compton or Thomson scattering[1] is widely investigated to generate high-brightness and quasi-monochromatic X-rays in the MeV region thanks to the advent of high-intensity laser. Based on the deep-in research of the underlying physics of converters, the dependence of the best energy resolution on the converting efficiency is quantitatively revealed. It shows that optimum parameters are strongly related to the process of Coulomb scattering. A sector-shaped double-focusing magnet with a large collecting solid angle is chosen to co-operate with the optimum converter to guarantee a large efficiency and a high resolution. The efficiency and the relative energy resolution of the designed spectrometer, according to Monte-Carlo simulation using Geant[4,17] are 10-4 e/p and about 5% respectively for 3 MeV photons. Based on Monte-Carlo simulations, the main properties of the spectrometer will be presented
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