Applicability of semiclassical methods for modeling laser-enhanced fusion rates in a realistic setting

Bekx, John Jasper; Lindsey, Martin Louis; Glenzer, S. H.; Schlesinger, Karl-Georg

doi:10.1103/physrevc.105.054001

Cited by 13 publications

(4 citation statements)

References 49 publications

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“…As the world's first hard x-ray freeelectron laser (xFEL), its ultra-short x-ray pulses, shorter than typical periods for most molecular vibrations, allow its international research users to peer into the inner workings of some of nature's key chemical reactions [1]. The very high peak brightness of these x-ray pulses also allow for imaging of the interior structure of material in extreme conditions of heat and density to elucidate the inner working of planets [2] and are helping expose the workings of fusion energy [3]. The breadth of scientific discovery opened by such a facility impacts fields from novel material designs to biological function, even helping drug design for SARS-CoV-2 [4].…”

Section: Introductionmentioning

confidence: 99%

EdgeAI: Machine learning via direct attached accelerator for streaming data processing at high shot rate x-ray free-electron lasers

Kraus¹,

Layad

Liu

et al. 2022

Front. Phys.

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We present a case for low batch-size inference with the potential for adaptive training of a lean encoder model. We do so in the context of a paradigmatic example of machine learning as applied in data acquisition at high data velocity scientific user facilities such as the Linac Coherent Light Source-II x-ray Free-Electron Laser. We discuss how a low-latency inference model operating at the data acquisition edge can capitalize on the naturally stochastic nature of such sources. We simulate the method of attosecond angular streaking to produce representative results whereby simulated input data reproduce high-resolution ground truth probability distributions. By minimizing the mean-squared error between the decoded output of the latent representation and the ground truth distributions, we ensure that the encoding layers and resulting latent representation maintains full fidelity for any downstream task, be it classification or regression. We present throughput results for data-parallel inference of various batch sizes, some with throughput exceeding 100 k images per second. We also show in situ training below 10 s per epoch for the full encoder–decoder model as would be relevant for streaming and adaptive real-time data production at our nation’s scientific light sources.

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Section: Introductionmentioning

confidence: 99%

EdgeAI: Machine learning via direct attached accelerator for streaming data processing at high shot rate x-ray free-electron lasers

Kraus¹,

Layad

Liu

et al. 2022

Front. Phys.

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“…On the other hand, Xray free-electron lasers already allow to generate coherent light of up 20 keV in frequency, thereby covering some of the low-energy nuclear excited states [28]. These intense light fields provide an alternative scheme to manipulate the nuclear process [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], in which the nonperturbative effects of intense light-matter interaction are expected to be essential. For example, theoretical treatments have been made on the possibility of using intense light to excite isomeric 229 Th [35][36][37][38], and to influence α decay [39][40][41][42], proton radioactivity [34], nuclear fission [43], or deuteron-triton fusion processes [44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

“…These intense light fields provide an alternative scheme to manipulate the nuclear process [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], in which the nonperturbative effects of intense light-matter interaction are expected to be essential. For example, theoretical treatments have been made on the possibility of using intense light to excite isomeric 229 Th [35][36][37][38], and to influence α decay [39][40][41][42], proton radioactivity [34], nuclear fission [43], or deuteron-triton fusion processes [44][45][46][47][48][49][50][51]. Moreover, these intense light fields may provide a new experimental platform for studies of atomic physics and nuclear physics on the femto-to nanometer scale [52].…”

Section: Introductionmentioning

confidence: 99%

Intense X-ray laser-induced proton emission from halo nuclei

Wu¹,

Liu²

2022

Preprint

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We investigate the intense X-ray laser-induced proton emission from halo nuclei within the framework of a nonperturbative quantum S-matrix approach. We have analytically deduced the angular differential as well as the total multi-photon rates of the proton emissions. For a linearly polarized X-ray laser field, we find that the angular distributions of proton emission sensitively depend on the laser frequency and show an interesting petal structure with increasing the laser frequency as well as the number of absorbed photons. Meanwhile, we find the Coulomb repulsion potential between the proton and the remainder nucleus has a strong hindering effect on the total multi-photon rates of the proton emissions, and leads to the blue shifts of the multi-photon transition frequency. Moreover, the polarization effects of laser fields on total rates of proton emission have also been addressed. We find that the polarized ellipticity corresponding to the maximum of the total rates depend on the laser frequency showing a transition from perturbative to nonperturbative proton emission. The underlying mechanism of the above findings is uncovered, and some implications are discussed.

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“…As emphasized in a number of recent publications, high-intensity lasers, ranging from the optical to the X-ray domain, may influence various nuclear processes, e.g., nuclear transitions by electronic [1,2] or muonic transitions [3], proton emission from nuclei via the nuclear photoeffect in an intense laser field and accompanied by a γ-ray [4], modification of α- [5][6][7] and proton decay rates [8], modification of heavy ion elastic scattering differential cross-sections [9,10] or the deuteron-triton fusion probability enhancement [11,12]. However, excepting perhaps the case of elastic scattering of heavy ions, the low photon energies and the insufficiently high power of these types of laser pulses are rather weakly disturbing the quantum states of the atomic nucleus.…”

Section: Introductionmentioning

confidence: 99%

Giant Dipole Multi-Resonances Excited by High-Frequency Laser Pulses

Mișicu

2022

Particles

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The worldwide advent of new laser facilities makes possible the investigation of the nuclear response to a very strong electromagnetic field. In this paper, we inquire on the excitation of one of the most conspicuous collective excitations, the giant dipole resonance, within the hydrodynamical model for a proton-neutron fluid mixture placed in a Skyrme mean-field and interacting with an external ultra-strong electromagnetic field. The variables of this approach are: proton and neutron displacement (velocity) fields, density fluctuations, and fluctuations of the electric field due to the coupling of the laser electromagnetic field to the dynamical distortions of the baryonic system (electro-magneto-hydrodynamical effect). We point out the occurrence of a multiresonance structure of the absorption cross-section.

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Applicability of semiclassical methods for modeling laser-enhanced fusion rates in a realistic setting

Cited by 13 publications

References 49 publications

EdgeAI: Machine learning via direct attached accelerator for streaming data processing at high shot rate x-ray free-electron lasers

EdgeAI: Machine learning via direct attached accelerator for streaming data processing at high shot rate x-ray free-electron lasers

Intense X-ray laser-induced proton emission from halo nuclei

Giant Dipole Multi-Resonances Excited by High-Frequency Laser Pulses

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