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

Frenje, J. A.; Li, C. K.; Séguin, F. H.; Kurebayashi, S.; Petrasso, R. D.; Soures, J. M.; Delettrez, J.; Glebov, V. Yu.; Meyerhofer, D. D.; Radha, P. B.; Roberts, S.; Sangster, T. C.; Skupsky, S.; Stoeckl, C.
November 2002
Physics of Plasmas;Nov2002, Vol. 9 Issue 11, p4719
Academic Journal
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/cm[sup 2]), an average shell areal density (71±3 mg/cm[sup 2]), 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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