Abstract
Quasimonochromatic x rays are difficult to produce above 100 keV, but have a number of uses in x-ray and nuclear science, particularly in the analysis of transuranic species. Inverse Compton scattering (ICS) is capable of fulfilling this need, producing photon beams with properties and energies well beyond the limits of typical synchrotron radiation facilities. We present the design and predicted output of such an ICS source at CBETA, a multiturn energy-recovery linac with a top energy of 150 MeV, which we anticipate producing x rays with energies above 400 keV and a collimated flux greater than 108 photons per second within a 0.5% bandwidth. At this energy, the anticipated flux exceeds that attainable from storage ring sources of synchrotron radiation, even though CBETA is a significantly smaller accelerator system. We also consider the consequences of extending the CBETA ICS source performance to higher electron energies, exploring achievable parameters and applications for MeV-scale photons. We foresee that future energy-recovery linacs may serve as ICS sources, capable of providing high energy photons unavailable at synchrotron radiation facilities or photon beams above approximately 300 keV which outperform sources at synchrotron radiation facilities in both flux and average brilliance.5 MoreReceived 8 September 2020Accepted 27 April 2021DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.050701Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International 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 AreasBeam dynamicsBeam opticsPhysical SystemsSynchrotron radiation facilitiesTechniquesCompton scatteringGamma-ray techniquesX-ray techniquesAccelerators & Beams
Highlights
Intense sources of high-energy photons above 1 keV can be obtained in the laboratory in one of four practical ways: discrete line gamma sources from radioactive decay, bremsstrahlung of electrons within a solid target, synchrotron radiation (SR), and inverse Compton scattering (ICS)
V compares the anticipated performance of the CBETA ICS to existing radiation sources, including ICS and storage ring sources, demonstrates how modestly extending the CBETA parameters provides a realistic design for MeV-scale photons through ICS, and explores potential applications
Whilst line sources provide photons in the MeV scale, they are not tunable, emit isotropically and are difficult to handle. Synchrotron radiation sources such as undulators are presently the primary method to generate intense, tunable radiation in the keV to MeV range. It was already pointed out by Krafft and Priebe [12] that the flux and brilliance offered by ICS sources are not competitive at the photon energies produced by synchrotron radiation facilities; many of the recent ICS source designs are intended to compromise between typical laboratory-scale xray sources, such as rotating cathode tubes, and synchrotron radiation facilities in terms of size, cost, access, availability, and x-ray quality [20]
Summary
Intense sources of high-energy photons above 1 keV can be obtained in the laboratory in one of four practical ways: discrete line gamma sources from radioactive decay, bremsstrahlung of electrons within a solid target, synchrotron radiation (SR), and inverse Compton scattering (ICS). Electron storage rings at the higher practicable stored bunch energies around 6–8 GeV (such as the national facilities ESRF [4], APS [5], and SPRING-8 [6]) can generate intense, monochromatic photons up to approximately 200 keV; while higher energies are possible, they are not typical These sources are hardly compact (the storage rings are around 1 km in circumference), and their output does not readily extend to the MeV scale. V compares the anticipated performance of the CBETA ICS to existing radiation sources, including ICS and storage ring sources, demonstrates how modestly extending the CBETA parameters provides a realistic design for MeV-scale photons through ICS, and explores potential applications
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