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Observation of ion temperatures exceeding background electron temperatures in petawatt laser-solid experiments

Norreys P. A. , Lancaster K. L., Habara H., Davies J. R., Mendonça, José Tolentino, 1965-, Clarke R. J., Dromey B., Gopal A., Karsch S., Kodama R., Krushelnick K., Moustaizis Stavros, Stoeckl C., Tatarakis, M, Tampo M., Vakakis Nikos, Wei M. S., Zepf, Markus, 1972-

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Περίληψη

Neutron time of flight signals have been observed with a high resolutionneutron spectrometer using the petawatt arm of the Vulcan laser facility atRutherford Appleton Laboratory from plastic sandwich targets containing adeuterated layer. The neutron spectra have two elements: a high-energycomponent generated by beam-fusion reactions and a thermal componentaround 2.45 MeV. The ion temperatures calculated from the neutron signalwidth clearly demonstrate a dependence on the front layer thickness andare significantly higher than electron temperatures measured under similarconditions. The ion heating process is intensity dependent and is not observedwith laser intensities on target below 1020 W cm−2. The measurements areconsistent with an ion instability driven by electron perturbations.

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