Abstract
Nowadays, generation of energy-tunable, monochromatic γ-rays is needed to establish a nondestructive assay method of nuclear fuel materials. The γ-rays are generated by collision of laser photons stored in a cavity and relativistic electrons. We propose a configuration of an enhancement cavity capable of performing polarization control fabricated by a combination of a four-mirror ring cavity with a small spot inside a cavity and a three-mirror of reflective optics as an image inverter for polarization-selectable γ-rays. The image inverter introduces a phase shift of specific polarization which can be used to generate an error signal to lock an optical cavity at a resonance condition.
Highlights
A resonantly enhanced optical pulse inside the cavity, namely enhancement cavity, has recently received broad attention because of high harmonic generation (HHG) inside a cavity with a multimegahertz repetition rate [1,2,3,4]
In the field of accelerator physics, the generation of hard X-ray or even γ-ray via inverse Compton scattering of laser photons stored in a cavity by a relativistic electron beam, which is produced by Energy Recovery Linac (ERL), is expected in many scientific and industrial applications
We propose the enhancement of optical pulses inside the cavity performing polarization control fabricated by a combination of a four-mirror ring cavity with a small spot inside a cavity and a three-mirror of reflective optics as an image inverter for polarization-selectable laser Compton scattering (LCS) γ-rays
Summary
A resonantly enhanced optical pulse inside the cavity, namely enhancement cavity, has recently received broad attention because of high harmonic generation (HHG) inside a cavity with a multimegahertz repetition rate [1,2,3,4]. In the field of accelerator physics, the generation of hard X-ray or even γ-ray via inverse Compton scattering of laser photons stored in a cavity by a relativistic electron beam, which is produced by Energy Recovery Linac (ERL), is expected in many scientific and industrial applications. Nuclear fuel materials are detected using nuclear resonance fluorescence with laser Compton scattering (LCS) γ-rays [8]. The angular distribution of nuclear resonance fluorescence γ-ray via multipole transitions is dependent on the polarization of LCS γ-ray. In the nondestructive assay for nuclear materials, this polarization control enables us to distinguish between the signal from the nuclear resonance fluorescence and background γ-rays. We propose the enhancement of optical pulses inside the cavity performing polarization control fabricated by a combination of a four-mirror ring cavity with a small spot inside a cavity and a three-mirror of reflective optics as an image inverter for polarization-selectable LCS γ-rays
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