The TUNL-FELL inverse Compton γ-ray source as a nuclear physics facility

Carman, T. S.; Litveninko, V.; Madey, J. M. J.; Neuman, C. P.; Norum, B.; O’Shea, P.G.; Roberson, N. R.; Scarlett, C.; Schreiber, Eric; Weller, H. R.

doi:10.1016/0168-9002(95)01486-1

Cited by 28 publications

(6 citation statements)

References 18 publications

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“…At the HIγS facility [44][45][46], nearly monoenergetic photon beams were produced by the intra-cavity Compton backscattering of linearly polarized Free-Electron Laser photons with a high energy electron beam. Polarization is conserved in this Compton scattering process, so intense, fully polarized photon beams can be produced with this technique.…”

Section: Methodsmentioning

confidence: 99%

Dipole response of76Se above 4 MeV

et al. 2013

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The dipole response of 76 34 Se in the energy range from 4 to 9 MeV has been analyzed using a ( γ, γ ) polarized photon scattering technique, performed at the High Intensity γ-Ray Source facility, to complement previous work performed using unpolarized photons. The results of this work offer both an enhanced sensitivity scan of the dipole response and an unambiguous determination of the parities of the observed J = 1 states. The dipole response is found to be dominated by E1 excitations, and can reasonably be attributed to a pygmy dipole resonance. Evidence is presented to suggest that a significant amount of directly unobserved excitation strength is present in the region, due to unobserved branching transitions in the decays of resonantly excited states. The dipole response of the region is underestimated when considering only ground state decay branches. We investigate the electric dipole response theoretically, performing calculations in a 3D cartesianbasis time-dependent Skyrme-Hartree-Fock framework.

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Section: Methodsmentioning

confidence: 99%

Dipole response of76Se above 4 MeV

et al. 2013

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“…(2) Design and development of the storage cavity and experimental demonstration of the increased intensities of tunable x-rays and gamma rays made possible through the use of an optical storage cavity to provide the high level of circulating optical power required for efficient x-and gamma-ray generation via inverse Compton scattering. Fundamental differences between our approach and other projects such as the Duke HIGS Laboratory [13] are discussed in Sec. IV B.…”

Section: B Scientific Goalmentioning

confidence: 99%

“…The basic design of our system is fundamentally constrained by the macropulse structure of our electron and optical beams. In facilities that employ cw pulse trains, such as the Duke HIGS Laboratory [13], maximum circulating power is achieved by maximizing the finesse, and the cw pulse train can build up to this maximum steadystate power independent of the length of the cavity. In contrast, our system uses macropulses of finite duration, and the number of passes in the storage cavity is thus finite.…”

Section: B Optical Storage Cavitymentioning

confidence: 99%

Free-electron laser inverse-Compton interaction x-ray source

Niknejadi

Kowalczyk²,

Hadmack³

et al. 2019

Phys. Rev. Accel. Beams

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Free-electron lasers (FEL) and synchrotron sources of high brilliance x-rays have proven to be of tremendous value in basic and applied research. Inverse-Compton sources (ICS) can achieve brilliance matching the requirements of many applications pioneered at those FEL and synchrotron facilitiesincluding phase contrast imaging, macromolecular x-ray crystallography, and x-ray microscopy-but with size, cost, and complexity compatible with a small laboratory. The free-electron laser inverse-Compton interaction compact x-ray source at the University of Hawaii at Manoa is a unique approach to an ICS which employs an FEL as the laser source. We have measured a total average flux of 3.0 × 10 5 photons=second with an average brilliance of 2.0 × 10 7 photons=s mm 2 mrad 2 0.1% of bandwidth (BW) with a peak energy of 10.9 keV from the source. While these results are modest in comparison to the standards set by other IC sources, upgrades to the system have the potential to increase the total average flux to 9.2 × 10 11 photons=second with an average brilliance of 1.9 × 10 12 photons=s mm 2 mrad 2 0.1% BW: comparing more favorably to other sources. We discuss the scientific program, the progress made in design and development, and the achievements of the source to date. We also outline future upgrades and integration needed to yield an enabling source for emerging high brilliance x-ray applications.

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“…The Inverse Compton Scattering (ICS) of laser light off high-energy electron beams is a well-established source of X-and gamma-rays for applications in medical, biological, nuclear, and material sciences [1][2][3][4][5][6][7][8][9]. One of the main advantages of ICS photon sources is the possibility to generate narrowband MeV photon beams, as opposed to a broad continuum of Bremsstrahlung sources, for instance.…”

mentioning

confidence: 99%

Optimizing Laser Pulses for Narrow-Band Inverse Compton Sources in the High-Intensity Regime

2019

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Scattering of ultraintense short laser pulses off relativistic electrons allows one to generate a large number of X-or gamma-ray photons with the expense of the spectral width-temporal pulsing of the laser inevitable leads to considerable spectral broadening. In this Letter, we describe a simple method to generate optimized laser pulses that compensate the nonlinear spectrum broadening, and can be thought of as a superposition of two oppositely linearly chirped pulses delayed with respect to each other. We develop a simple analytical model that allow us to predict the optimal parameters of such a two-pulse-the delay, amount of chirp and relative phase-for generation of a narrowband γ-ray spectrum. Our predictions are confirmed by numerical optimization and simulations including 3D effects.

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The TUNL-FELL inverse Compton γ-ray source as a nuclear physics facility

Cited by 28 publications

References 18 publications

Dipole response of76Se above 4 MeV

Dipole response of76Se above 4 MeV

Free-electron laser inverse-Compton interaction x-ray source

Optimizing Laser Pulses for Narrow-Band Inverse Compton Sources in the High-Intensity Regime

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