29 research outputs found
Precision neutron interferometric measurements of the n-p, n-d, and n-3He zero-energy coherent neutron scattering amplitudes
We have performed high precision measurements of the zero-energy neutron
scattering amplitudes of gas phase molecular hydrogen, deuterium, and He
using neutron interferometry. We find
fm\cite{Schoen03},
fm\cite{Black03,Schoen03}, and
fm\cite{Huffman04}. When combined with the previous world data, properly
corrected for small multiple scattering, radiative corrections, and local field
effects from the theory of neutron optics and combined by the prescriptions of
the Particle Data Group, the zero-energy scattering amplitudes are:
fm, fm, and fm. The precision of
these measurements is now high enough to severely constrain NN few-body models.
The n-d and n-He coherent neutron scattering amplitudes are both now in
disagreement with the best current theories. The new values can be used as
input for precision calculations of few body processes. This precision data is
sensitive to small effects such as nuclear three-body forces, charge-symmetry
breaking in the strong interaction, and residual electromagnetic effects not
yet fully included in current models.Comment: 6 pages, 4 figures, submitted to Physica B as part of the Festschrift
honouring Samuel A. Werner at the International Conference on Neutron
Scattering 200
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Modeling 10 GeV laser-plasma accelerators and conventional accelerators using boosted computational frames
It can be computationally advantageous to perform computer simulations in a Lorentz boosted frame for a certain class of particle acceleration devices or problems such as: free electron laser, laser-plasma accelerator, particle beams interacting with electron clouds [1]. Complications arising from calculating in a Lorentz boosted frame and respective solutions have now been further analyzed, supporting more successful applications of the method to these problems. Most notably, full PIC 3D simulations of 10 GeV laser acceleration stages were enabled, with demonstrated convergence at a few percent level at various gammas, with speed-ups of 1,000 or more. Such simulations are important to the design of next generation accelerators. We will present and discuss the latest developments of the method illustrated with various examples of its application
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