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Your search keyword '"Yuan, X. H."' showing total 4 results
Start Over Author "Yuan, X. H." Topic electron transport
4 results on '"Yuan, X. H."'

1. Directed fast electron beams in ultraintense picosecond laser irradiated solid targets.

Author

Ge, X. L., Lin, X. X., Yuan, X. H., Carroll, D. C., Gray, R. J., Yu, T. P., Tresca, O., Chen, M., Liu, F., Zhuo, H. B., Zielbauer, B., Zhao, L., Neely, D., Sheng, Z. M., Li, Y. T., and McKenna, P.

Subjects
ULTRASHORT laser pulses, ELECTRON beams, ELECTRON transport, ELECTRON emission, RELATIVISTIC electrons, LIGHT propagation, OPTICAL polarization, PHOTONS
Abstract

We report on fast electron transport and emission patterns from solid targets irradiated by s-polarized, relativistically intense, picosecond laser pulses. A beam of multi-MeV electrons is found to be transported along the target surface in the laser polarization direction. The spatialintensity and energy distributions of this beam are compared with the beam produced along the laser propagation axis. It is shown that even for peak laser intensities an order of magnitude higher than the relativistic threshold, laser polarization still plays an important role in electron energy transport. Results from 3D particle-in-cell simulations confirm the findings. The characterization of directional beam emission is important for applications requiring efficient energy transfer, including secondary photon and ion source development. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Relativistic Current Dynamics Investigations By Proton Probing.

Author

Borghesi, M., Quinn, K., Wilson, P. A., Cecchetti, C. A., Ramakrishna, B., Romagnani, L., Sarri, G., Lancia, L., Fuchs, J., Pipahl, A., Toncian, T., Willi, O., Carroll, D. C., Gallegos, P., Quinn, M. N., Yuan, X. H., McKenna, P., Clarke, R. J., Evans, R. G., and Neely, D.

Subjects
ELECTROMAGNETIC fields, ELECTRIC fields, ELECTRONS, FIELD theory (Physics), PARTICLES (Nuclear physics)
Abstract

The proton probing technique has been used to investigate the incidence of a mid-1019 W cm-2 pulse with metallic wire and laminar foam targets. Electric fields ∼1010 V·m-1 are measured on the surface of the 125 μm-diameter wire in the wake of the laser interaction as it charges and discharges within a 20 ps temporal window, whilst the employment of a novel experimental technique permits the observation of the propagation of a charging front at ∼c away from the point of interaction. In the foam shots, meanwhile, the behaviour of the hot electrons generated by the interaction pulse is probed inside the target. Evidence of electric inhibition effects and filamentation is found. [ABSTRACT FROM AUTHOR]

Published
2009
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3. Injection and transport properties of fast electrons in ultraintense laser-solid interactions.

Author

Coury, M., Carroll, D. C., Robinson, A. P. L., Yuan, X. H., Brenner, C. M., Burza, M., Gray, R. J., Lancaster, K. L., Li, Y. T., Lin, X. X., MacLellan, D. A., Powell, H., Quinn, M. N., Tresca, O., Wahlström, C.-G., Neely, D., and McKenna, P.

Subjects
ELECTRON beams, ULTRASHORT laser pulses, INJECTION lasers, MAGNETIC fields, ELECTRON transport, PROTON accelerators, THICKNESS measurement, TARGETS (Nuclear physics), SIMULATION methods & models
Abstract

Fast electron injection and transport in solid foils irradiated by sub-picosecond-duration laser pulses with peak intensity equal to 4×1020 W/cm2 is investigated experimentally and via 3D simulations. The simulations are performed using a hybrid-particle-in-cell (PIC) code for a range of fast electron beam injection conditions, with and without inclusion of self-generated resistive magnetic fields. The resulting fast electron beam transport properties are used in rear-surface plasma expansion calculations to compare with measurements of proton acceleration, as a function of target thickness. An injection half-angle of ∼50°-70° is inferred, which is significantly larger than that derived from previous experiments under similar conditions. [ABSTRACT FROM AUTHOR]

Published
2013
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4. Annular Fast Electron Transport in Silicon Arising from Low-Temperature Resistivity.

Author

MacLellan, D. A., Carroll, D. C., Gray, R. J., Booth, N., Burza, M., Desjarlais, M. P., Du, F., Gonzalez-Izquierdo, B., Neely, D., Powell, H. W., Robinson, A. P. L., Rusby, D. R., Scott, G. G., Yuan, X. H., Wahlström, C.-G., and McKenna, P.

Subjects
*ELECTRON transport, *SILICON, *LOW temperatures, *LASER pulses, *ELECTRICAL resistivity, *MAGNETIC fields
Abstract

Fast electron transport in Si, driven by ultraintense laser pulses, is investigated experimentally and via 3D hybrid particle-in-cell simulations. A transition from a Gaussian-like to an annular fast electron beam profile is demonstrated and explained by resistively generated magnetic fields. The results highlight the potential to completely transform the beam transport pattern by tailoring the resistivity-temperature profile at temperatures as low as a few eV. [ABSTRACT FROM AUTHOR]

Published
2013
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