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Fourkal E , Veltchev I , Ma CM
Laser-to-proton energy transfer efficiency in laser-plasma interactions
Journal of Plasma Physics. 2009 Apr;75 :235-250
AbstractIt is shown that the energy of protons accelerated in laser matter inter-action experiments may be significantly increased through the process of splitting the incoming laser pulse into multiple interaction stages of equal intensity. From a thermodynamic point of view, the splitting procedure can be viewed as an effective way of increasing the efficiency of energy transfer from the laser light to protons, which peaks for processes having the least amount of entropy gain. It is predicted that it should be possible to achieve at least a 100% increase in the energy efficiency in a six-stage laser proton accelerator compared with a single laser target interaction scheme.
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