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Characterization of electron beam propagation through foils by innershell X-ray spectroscopy

Published online by Cambridge University Press:  30 July 2001

G. PRETZLER ,
TH. SCHLEGEL  and
E. FILL
G. PRETZLER
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany Sektion Physik, Universität München, D-85748, Garching, Germany
TH. SCHLEGEL
Affiliation:
Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
E. FILL
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
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Abstract

Characteristic X-rays generated by high-intensity laser interaction with solids were investigated and used for determining the resulting hot electron populations. Spectrally as well as spatially resolved data are evaluated for this purpose. The experimental data were compared with Monte Carlo simulations to determine the electron energy distribution and geometric features of the electron beam. These results are in good agreement with PIC simulations. The self-generated low-resistivity channel of the electron beam results in a distinct difference in the generated rear-side X-ray spot when the electron beam propagates in an insulator rather than a metal. Self-generated electric fields prevent electron propagation into the vacuum. This fact is used for demonstrating photopumping of cobalt with copper Kα radiation, an experiment relevant to innershell X-ray laser schemes. The emission of cobalt is compared with that of nickel, which is not photopumped by copper Kα, and is found to be enhanced by a factor of 2.5.

Type
Research Article
Information
Laser and Particle Beams , Volume 19 , Issue 1 , January 2001 , pp. 91 - 97
Copyright
© 2001 Cambridge University Press

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