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Nov 2002

Volume 9, Issue 11, pp. 4427-4828

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back to top Inertially Confined Plasmas, Dense Plasmas, Equations of State

Observation of ion heating by stimulated-Brillouin-scattering-driven ion-acoustic waves using Thomson scattering

D. H. Froula, L. Divol, H. A. Baldis, R. L. Berger, D. G. Braun, B. I. Cohen, R. P. Johnson, D. S. Montgomery, E. A. Williams, and S. H. Glenzer

Phys. Plasmas 9, 4709 (2002); http://dx.doi.org/10.1063/1.1508776 (10 pages) | Cited 13 times

Online Publication Date: 23 October 2002

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Thomson-scattering measurements of the growth of ion-acoustic waves are obtained from well-characterized multi-ion-species plasmas consisting of gold and beryllium. Simultaneously, the ion temperature is accurately measured by comparing the relative amplitude of thermal ion-acoustic modes. A twofold increase in ion temperature was measured when ion-acoustic waves are excited to large amplitudes by stimulated Brillouin scattering (SBS). This increase in ion temperature is a strong indication of hot ions due to trapping. The measured SBS reflectivity is explained by nonlinear detuning of the SBS instability due to these trapping effects. © 2002 American Institute of Physics.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.38.-r Laser-plasma interactions
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)

Measurements of fuel and shell areal densities of OMEGA capsule implosions using elastically scattered protons

J. A. Frenje, C. K. Li, F. H. Séguin, S. Kurebayashi, R. D. Petrasso, J. M. Soures, J. Delettrez, V. Yu. Glebov, D. D. Meyerhofer, P. B. Radha, S. Roberts, T. C. Sangster, S. Skupsky, and C. Stoeckl

Phys. Plasmas 9, 4719 (2002); http://dx.doi.org/10.1063/1.1511196 (7 pages) | Cited 4 times

Online Publication Date: 23 October 2002

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Implosions of capsules filled with small quantities of deuterium–tritium (DT) were studied using up to seven proton spectrometers on the OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Simultaneous measurements of elastically scattered protons, i.e., “knock-on” protons generated from DT neutrons were obtained in several directions. The capsules, nominally 945 μm in diameter and with CD shells of ∼20 μm thickness, were filled to about 15 atm and irradiated with 23 kJ of UV light. The high-energy protons from these implosions were used to infer fuel areal density (6.8±0.5 mg/cm2), an average shell areal density (71±3 mg/cm2), and shell asymmetries of up to about 25 mg/cm2. In addition to presenting new results, these measurements verify and significantly improve upon the accuracy of the fuel areal density results obtained utilizing knock-on deuterons from hydrodynamically equivalent, pure DT implosions [C. K. Li et al., Phys. Plasmas 8, 4902 (2001)]. © 2002 American Institute of Physics.
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52.70.-m Plasma diagnostic techniques and instrumentation
52.80.Qj Explosions; exploding wires
28.52.Lf Components and instrumentation
52.25.Kn Thermodynamics of plasmas
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