Physics – Plasma Physics
Scientific paper
2006-11-17
Physics
Plasma Physics
18 pages
Scientific paper
In Part I (physics/0405091), it was shown that it is possible to achieve efficient heating of cylindrical targets by electromagnetic beams with transverse dimensions that are several orders of magnitude greater than those of the cylinder. Part II contains derivation of the detailed conditions of efficient heating in the longitudinal geometry and establishes a broader domain of parameters providing efficient heating in the transverse geometry. One possible implementation using currently available technology is considered: a nanotube (length 1 cm, diameter 15 nm) may be heated in the transverse geometry by a 30 femtosecond pulse of a 50 GW Ti:Sapphire laser (wavelength 800 nm) to a temperature of 1 keV with heating efficiency of 16 per cent. The resulting energy density exceeds 100 MJ/cm3. An exact formula in the form of a one-dimensional integral is obtained for the amount of energy absorbed in the cylinder heated by a gaussian electromagnetic beam in the longitudinal geometry.
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