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Your search keyword '"Witte, K. J."' showing total 2 results
Start Over Author "Witte, K. J." Topic energy transfer
2 results on '"Witte, K. J."'

1. Acceleration Dynamics of Laser-Driven MeV-Ion Jets.

Author

Hegelich, M., Allen, M., Audebert, P., Blazevic, A., Cowan, T., Fuchs, J., Gauthier, J. C., Geissel, M., Guenther, W., Habs, D., Karsch, S., Kemp, A., Pretzler, G., Roth, M., and Witte, K. J.

Subjects
ENERGY transfer, CARBON, JETS (Fluid dynamics), SPECTRUM analysis
Abstract

Collimated jets of carbon and fluorine ions up to 5 MeV/nucleon (∼100MeV) are observed from the rear surface of thin foils irradiated with laser intensities of up to 5 × 10[SUP19]W/cm[SUP2]. The normally dominant proton acceleration could be suppressed by removing the hydrocarbon contaminants by resistive heating. This inhibits screening effects and permits effective energy transfer and acceleration of other ion species. The acceleration dynamics and the spatio-temporal distributions of the accelerating E-fields at the rear surface of the target are inferred from the detailed spectra. [ABSTRACT FROM AUTHOR]

Published
2003

2. Spectral properties of laser-accelerated mid-Z MeV/u ion beams.

Author

Hegelich, B. M., Albright, B., Audebert, P., Blazevic, A., Brambrink, E., Cobble, J., Cowan, T., Fuchs, J., Gauthier, J. C., Gautier, C., Geissel, M., Habs, D., Johnson, R., Karsch, S., Kemp, A., Letzring, S., Roth, M., Schramm, U., Schreiber, J., and Witte, K. J.

Subjects
LASERS, ION bombardment, PARTICLES (Nuclear physics), NUCLEAR physics, SIMULATION methods & models, ENERGY transfer
Abstract

Collimated jets of beryllium, carbon, oxygen, fluorine, and palladium ions with >1 MeV/nucleon energies are observed from the rear surface of thin foils irradiated with laser intensities of up to 5×1019 W/cm2. The normally dominant proton acceleration is suppressed when the target is subjected to Joule heating to remove hydrogen-bearing contaminant. This inhibits screening effects and permits effective energy transfer to and acceleration of heavier ion species. The influence of remnant protons on the spectral shape of the next highest charge-to-mass ratio species is shown. Particle-in-cell simulations confirming the experimental findings are presented. [ABSTRACT FROM AUTHOR]

Published
2005
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