Experimental observations of transport of picosecond laser generated electrons in a nail-like target
- University of California San Diego, La Jolla, California 92093-0417 (United States)
The transport of relativistic electrons, generated by the interaction of a high intensity (2x10{sup 20} W/cm{sup 2}) laser, has been studied in a nail-like target comprised of a 20 {mu}m diameter solid copper wire, coated with {approx}2 {mu}m of titanium, with an 80 {mu}m diameter hemispherical termination. A {approx}500 fs, {approx}200 J pulse of 1.053 {mu}m laser light produced by the Titan Laser at Lawrence Livermore National Laboratory was focused to a {approx}20 {mu}m diameter spot centered on the flat face of the hemisphere. K{sub {alpha}} fluorescence from the Cu and Ti regions was imaged together with extreme ultraviolet (XUV) emission at 68 and 256 eV. Results showed a quasiexponential decline in K{sub {alpha}} emission along the wire over a distance of a few hundred microns from the laser focus, consistent with bulk Ohmic inhibition of the relativistic electron transport. Weaker K{sub {alpha}} and XUV emission on a longer scale length showed limb brightening suggesting a transition to enhanced transport at the surface of the wire.
- OSTI ID:
- 21072671
- Journal Information:
- Physics of Plasmas, Vol. 14, Issue 12; Other Information: DOI: 10.1063/1.2815790; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHARGED-PARTICLE TRANSPORT
COPPER
ELECTRONS
EV RANGE
EXTREME ULTRAVIOLET RADIATION
FLUORESCENCE
LASER-PRODUCED PLASMA
LASERS
LAWRENCE LIVERMORE NATIONAL LABORATORY
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
PULSES
RELATIVISTIC PLASMA
RELATIVISTIC RANGE
TITANIUM
WIRES