D-{sup 3}He proton spectra for diagnosing shell {rho}R and fuel T{sub i} of imploded capsules at OMEGA
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 16423 (United States)
Recent work has resulted in the first high-resolution, spectroscopic measurements of energetic charged particles on OMEGA laser facility [T. R. Boehly et al., Opt. Commun. 133, 496 (1997)]. Energy spectra of charged fusion products have been obtained from two spectrometers, and have been used to deduce various physical quantities in imploded capsules. In this paper the first use of 14.7 MeV deuterium-helium3 (D-{sup 3}He) proton spectra for diagnosing shell areal density ({rho}R) and fuel ion temperature (T{sub i}) is discussed. For thick-plastic shell capsules, shell areal densities between 20 and 70 mg/cm2 and ion temperatures between 3 and 5 keV have been determined. The spectral linewidths associated with such capsules are found to be wider than the doppler widths. This effect, the focus of future study, is the result of {rho}R evolution during the burn; or is the result of an extended burn region; or results from nonuniformities in the shell. For thin-glass shell capsules, the spectral linewidths are dominated by the doppler width, and ion temperatures between 10 and 15 keV were determined. These measurements have been also compared and contrasted with the results from neutron measurements and from one-dimension hydrodynamic simulations. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20216548
- Journal Information:
- Physics of Plasmas, Vol. 7, Issue 6; Other Information: PBD: Jun 2000; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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