Abstract
Narrow-bandwidth photon beams in the x-ray and γ-ray energy ranges are expected to be applied in various fields. An energy recovery linac (ERL)-based laser Compton scattering (LCS) source employing a laser enhancement cavity can produce a high-flux and narrow-bandwidth photon beam. We conducted the first experiment of an ERL-based LCS source in combination with a laser enhancement cavity. We obtained LCS photons with an energy of 6.95±0.01 keV by colliding an electron beam of 20 MeV with a laser of 1064 nm wavelength. The photon flux at the interaction point was evaluated to be (2.6±0.1)×107 photons/s with an average beam current of 58 μA and an average laser power of 10 kW. The energy bandwidth was evaluated to be 0.4% (rms) with an opening angle of 0.14 mrad. The technologies demonstrated in this experiment are applicable for future ERL-based LCS sources.23 MoreReceived 30 June 2016DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.114701Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasOptics & lasersX-ray beams & opticsPhysical SystemsEnergy recovery linacsTechniquesCompton scatteringAccelerators & Beams
Highlights
When a relativistic electron beam collides with a laser beam, a high-energy photon beam is generated through laser Compton scattering (LCS) [1]
In the design and construction of the compact ERL (cERL), we primarily focused on the generation and acceleration of a small-emittance electron beam with a high repetition rate, that is, high average current
From the viewpoint of a Monte Carlo simulation study, we show that an accurate and precise HKED measurement is possible by using a narrow-bandwidth photon beam based on the energy recovery linac (ERL) combined with the laser enhancement cavity [34]
Summary
When a relativistic electron beam collides with a laser beam, a high-energy photon beam is generated through laser Compton scattering (LCS) [1]. The duty factor of a linac-based source is limited to ∼10−4, it can realize a tightly focused electron beam It can achieve better performance than a storage-ring-based source in terms of the bandwidth, spectral density, and photon flux in a specific energy width of the γ-ray beam. In [20], a 350-MeV ERL was designed to generate a 2-MeV γ-ray beam for nuclear industrial applications In these LCS sources, laser enhancement cavities were used for the highrepetition and high-density collision of electron and laser beams. This research was conducted using an ERL test accelerator at KEK, the compact ERL (cERL), and covered a wide range of subjects including generation and transportation of a small-emittance electron beam, design and fabrication of a high-finesse optical cavity, alignment and synchronization of electron and laser beams at collision, and management of electron beam halo to reduce radiation background downstream of the LCS beam line.
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