Výsledky vyhledávání

Scattered and (n,2n) neutrons as a measure of areal density in ICF capsules

Autor: J.-L. Bourgade, L. Disdier, Doug Wilson, W.C. Mead, Thomas J. Murphy, M. Houry

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 488:400-409

The fraction of low-energy neutrons created from 14 MeV neutrons by elastic scattering and (n,2n) reactions on D and T has been proposed as a measure of the areal density 〈ρr〉 (radial integral of density) of ICF targets. In simple situations the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d3b711a46bae7931a8f7f7f9218db1a4
https://doi.org/10.1016/s0168-9002(02)00474-6

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Adaptive optimization and control using neural networks

Autor: W.C. Mead, P.S. Bowling, C.W. Barnes, Roger Jones, S.K. Brown

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 352:309-315

Recent work has demonstrated the ability of neural-network-based controllers to optimize and control machines with complex, non-linear, relatively unknown control spaces. We present a brief overview of neural networks via a taxonomy illustrating some

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4997f85532e66201843a1301042f904a
https://doi.org/10.1016/0168-9002(94)91530-x

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Optimization and control of a small-angle negative ion source using an on-line adaptive controller based on the connectionist normalized local spline neural network

Autor: H.E. Gibson, J.R. Goulding, P.S. Bowling, Y.C. Lee, Cris W. Barnes, Roger Jones, W.C. Mead, S.K. Brown

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 72:271-289

We have developed CTL, an on-line adaptive controller, to optimize and control a repetitively pulsed, small-angle negative ion source. CTL processes multiple diagnostics to determine the ion source operating conditions. A figure of merit is construct

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4cd8864672c0f19e2460c2228678725a
https://doi.org/10.1016/0168-583x(92)95243-k

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'Dipole Magnets'-a computer-based tutorial

Autor: R. R. Silbar, R.A. Williams, A. A. Browman, W.C. Mead

Publikováno v: Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366).

Dipole Magnets is one of a set of self-paced interactive training tutorials on particle accelerators that target a broad audience. It covers the bending and focusing properties of dipole magnets. The tutorial contains five sections, four of which are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d25bc3b91605d0743e4617fe92a5a9eb
https://doi.org/10.1109/pac.1999.792939

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Information theoretic derivation of network architecture and learning algorithms

Autor: Y. C. Lee, W.C. Mead, Roger Jones, C.W. Barnes

Publikováno v: IJCNN-91-Seattle International Joint Conference on Neural Networks.

Using variational techniques, the authors derive a feedforward network architecture that minimizes a least squares cost function with the soft constraint that the mutual information between input and output is maximized. This permits optimum generali

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2b0b82537549d576979e21f4c092149e
https://doi.org/10.1109/ijcnn.1991.155379

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Scaling of high-Z laser plasmas with energy and pulselength

Autor: W.C. Mead, S.R. Goldman

Publikováno v: Nuclear Fusion. 26:813-826

The authors have used LASNEX modelling, which matches most current experiments, to study the scaling of high-Z laser-target interactions to the higher laser energies and longer pulses appropriate to future inertial fusion targets. Results are present

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f1a58a8f244064cae8a8d0fd103dadb7
https://doi.org/10.1088/0029-5515/26/6/010

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The physics of burn in magnetized deuterium-tritium plasmas: spherical geometry

Autor: Roger Jones, W.C. Mead

Publikováno v: Nuclear Fusion. 26:127-137

There is a large region of density-temperature space in which the effects of a magnetic field on heat transport and alpha-particle mobility are significant and the magnetic pressure is small compared with the pressure of a deuterium-tritium plasma. S

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1795802cb9c9fc10742b4c3504371b51
https://doi.org/10.1088/0029-5515/26/2/001

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Mechanisms of the plasma spatial filter for high‐power lasers

Autor: J. J. Thomson, W.C. Mead, Claire E. Max

Publikováno v: Applied Physics Letters. 29:783-785

We describe mechanisms operating in the plasma spatial filter. Curvature of the critical density surface of the blow‐off plasma causes high and intermediate spatial frequencies on the incoming laser beam to be rejected. In addition, time‐dependen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::607fc1ff5630263d140c367efe57eacb
https://doi.org/10.1063/1.88947

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