A route to the brightest possible neutron source?
ABSTRACT We review the potential to develop sources for neutron scattering science and propose that a merger with the rapidly developing field of inertial fusion energy could provide a major step-change in performance. In stark contrast to developments in synchrotron and laser science, the past 40 years have seen only a factor of 10 increase in neutron source brightness. With the advent of thermonuclear ignition in the laboratory, coupled to innovative approaches in how this may be achieved, we calculate that a neutron source three orders of magnitude more powerful than any existing facility can be envisaged on a 20- to 30-year time scale. Such a leap in source power would transform neutron scattering science.
SourceAvailable from: Koichi Yamakawa[Show abstract] [Hide abstract]
ABSTRACT: Recent progress in high power lasers enables us to access a regime of high-energy-density and/or ultra-strong fields that was not accessible before, opening up a fundamentally new physical domain which includes laboratory astrophysics and laser nuclear physics. In this article, new applications of high-energy and ultra-intense laser will be reviewed.Journal of the Optical Society of Korea 09/2008; 12(3):178-185. DOI:10.3807/JOSK.2008.12.3.178 · 0.96 Impact Factor
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ABSTRACT: Neutron yields of the nuclear reactions induced by accelerated deuterium or carbon ions when solid deuterated targets (CD or CD2) are irradiated by ultra-intense lasers have been investigated. The energies of the accelerated ions have been calculated at different laser intensities. Nuclear reactions that have threshold energies less than the maximum ion acceleration, in each case, have been studied in detail. The mechanisms of these reactions, at different ion energies, have been discussed and the relevant cross sections have been calculated to compare the neutron yield of each reaction with that of the fusion reaction D(d,n)3He. The study indicates that at a certain value of laser intensity, when the accelerated ion energy is sufficient, the energy spectrum of the neutron yields of the reactions D(d,np)D, 12C(d,n)13N, 12C(d,np)12C and D(12c,n)13N will overlap with the spectrum of the neutron yield of the D(d,n)3He reaction. Then, it is impossible to distinguish the different neutron yields experimentally despite the fact that the total neutron yield can be measured. However, by calculating the relative importance of the neutron yield of each reaction, the contribution of the fusion reaction to the total neutron yield can be estimated. Our calculations point out that the total neutron yield of the reactions 12C(d,n)13N and D(12c,n)13N can exceed the neutron yield of the D(d,n)3He reaction. Also, the total neutron yield of the breakup reactions D(d,np)D and 12C(d,np)12C is comparable with the neutron yield of the D(d,n)3He reaction and the produced neutrons will overlap the 2.45 MeV neutrons.Physica Scripta 12/2012; 87(1):015501. DOI:10.1088/0031-8949/87/01/015501 · 1.30 Impact Factor
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ABSTRACT: It was suggested more than three decades ago that the three-dimensional structure of one particle may be determined using the simultaneous x-ray scattering from many randomly oriented copies ab initio , without modelling of a priori information. This may be possible, provided sufficiently brief and intense x-ray pulses that can ‘outrun’ the effects of radiation damage and simultaneously produce significant signal within ‘snapshot’ diffraction patterns. Because the ensemble of particles is static throughout the snapshot exposure, solution scattering patterns contain angular intensity fluctuations and thus differ from conventional isotropic scattering patterns. X-ray free-electron lasers may be able to provide the x-ray source properties that are required to make such experiments feasible. In this tutorial we discuss how structures might be determined through correlated x-ray scattering measurements, with an emphasis on dilute suspensions of identical bioparticles.Journal of Physics B Atomic Molecular and Optical Physics 11/2012; 45(22):223001. DOI:10.1088/0953-4075/45/22/223001 · 1.92 Impact Factor