Observation of ion temperatures exceeding background electron temperatures in petawatt laser-solid experiments
| Autor: | H. Habara, Brendan Dromey, Mingsheng Wei, S. Karsch, A. Gopal, José Tito Mendonça, Christian Stoeckl, N. Vakakis, Motonobu Tampo, Michael Tatarakis, R. J. Clarke, Karl Krushelnick, S. D. Moustaizis, Kate Lancaster, Ryosuke Kodama, Peter Norreys, Matthew Zepf, J. R. Davies |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Spectrometer Capture gamma ray spectroscopy Neutron Neutron capture spectroscopy Spectroscopy Neutron capture neutron capture gamma ray spectroscopy capture gamma ray spectroscopy neutron neutron capture spectroscopy spectroscopy neutron capture Electron Condensed Matter Physics Laser law.invention Ion Time of flight Nuclear Energy and Engineering Deuterium Physics::Plasma Physics law Neutron Atomic physics Nuclear Experiment Inertial confinement fusion |
| Zdroj: | Plasma Physics and Controlled Fusion. 47:L49-L56 |
| ISSN: | 1361-6587 0741-3335 |
| DOI: | 10.1088/0741-3335/47/11/l01 |
| Popis: | Summarization: Neutron time of flight signals have been observed with a high resolution neutron spectrometer using the petawatt arm of the Vulcan laser facility at Rutherford Appleton Laboratory from plastic sandwich targets containing a deuterated layer. The neutron spectra have two elements: a high-energy component generated by beam-fusion reactions and a thermal component around 2.45 MeV. The ion temperatures calculated from the neutron signal width clearly demonstrate a dependence on the front layer thickness and are significantly higher than electron temperatures measured under similar conditions. The ion heating process is intensity dependent and is not observed with laser intensities on target below 1020 W cm−2. The measurements are consistent with an ion instability driven by electron perturbations. Presented on: Plasma Physics and Controlled Fusion |
| Databáze: | OpenAIRE |
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