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Title: Advanced-Ignition-Concept Exploration on OMEGA

Abstract

Advanced ignition concepts, such as fast ignition and shock ignition, are being investigated at the Omega Laser Facility. Integrated fast-ignition experiments with room-temperature re-entrant cone targets have begun, using 18 kJ of 351 nm drive energy to implode empty 40μm thick CD shells, followed by 1.0 kJ of 1053 nm wavelength, short-pulse energy. Short pulses of 10 ps width have irradiated the inside of a hollow gold re-entrant cone at the time of peak compression. A threefold increase in the time-integrated, 2 to 7 keV x-ray emission was observed with x-ray pinhole cameras, indicating that energy is coupled from the short-pulse laser into the core by fast electrons. In shock-ignition experiments, spherical plastic-shell targets were compressed to high areal densities on a low adiabat, and a strong shock wave was sent into the converging, compressed capsule. In one experiment, 60 beams were used with an intensity spike at the end of the laser pulse, and the implosion performance was studied through neutron-yield and areal-density measurements. In a second experiment, the 60 OMEGA beams were split into a 40+20 configuration, with 40 low-intensity beams used for fuel assembly and 20 delayed beams with a short, high-intensity pulse shape (up to 1×1016more » Wcm^-2) for shock generation.« less

Authors:
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Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE
OSTI Identifier:
968016
Report Number(s):
DOE/NA/28302-915-2
2009-18; 1898
DOE Contract Number:  
FC52-08NA28302
Resource Type:
Other
Country of Publication:
United States
Language:
English

Citation Formats

Theobald, W, Anderson, K S, Betti, R, Craxton, R S, Delettrez, J A, Frenje, J A, Glebov, V Yu, Gotchev, O V, Kelly, J H, Li, C K, Mackinnon, A J, Marshall, F J, McCrory, R L, Meyerhofer, D D, Myatt, J F, Norreys, P A, Nilson, P M, Patel, P K, Petrasso, R D, Radha, P B, Ren, C, Sangster, T C, Seka, W, Smalyuk, V A, Solodov, A A, Stephens, R B, Stoeckl, C, and Yaakobi, B. Advanced-Ignition-Concept Exploration on OMEGA. United States: N. p., 2009. Web.
Theobald, W, Anderson, K S, Betti, R, Craxton, R S, Delettrez, J A, Frenje, J A, Glebov, V Yu, Gotchev, O V, Kelly, J H, Li, C K, Mackinnon, A J, Marshall, F J, McCrory, R L, Meyerhofer, D D, Myatt, J F, Norreys, P A, Nilson, P M, Patel, P K, Petrasso, R D, Radha, P B, Ren, C, Sangster, T C, Seka, W, Smalyuk, V A, Solodov, A A, Stephens, R B, Stoeckl, C, & Yaakobi, B. Advanced-Ignition-Concept Exploration on OMEGA. United States.
Theobald, W, Anderson, K S, Betti, R, Craxton, R S, Delettrez, J A, Frenje, J A, Glebov, V Yu, Gotchev, O V, Kelly, J H, Li, C K, Mackinnon, A J, Marshall, F J, McCrory, R L, Meyerhofer, D D, Myatt, J F, Norreys, P A, Nilson, P M, Patel, P K, Petrasso, R D, Radha, P B, Ren, C, Sangster, T C, Seka, W, Smalyuk, V A, Solodov, A A, Stephens, R B, Stoeckl, C, and Yaakobi, B. 2009. "Advanced-Ignition-Concept Exploration on OMEGA". United States.
@article{osti_968016,
title = {Advanced-Ignition-Concept Exploration on OMEGA},
author = {Theobald, W and Anderson, K S and Betti, R and Craxton, R S and Delettrez, J A and Frenje, J A and Glebov, V Yu and Gotchev, O V and Kelly, J H and Li, C K and Mackinnon, A J and Marshall, F J and McCrory, R L and Meyerhofer, D D and Myatt, J F and Norreys, P A and Nilson, P M and Patel, P K and Petrasso, R D and Radha, P B and Ren, C and Sangster, T C and Seka, W and Smalyuk, V A and Solodov, A A and Stephens, R B and Stoeckl, C and Yaakobi, B},
abstractNote = {Advanced ignition concepts, such as fast ignition and shock ignition, are being investigated at the Omega Laser Facility. Integrated fast-ignition experiments with room-temperature re-entrant cone targets have begun, using 18 kJ of 351 nm drive energy to implode empty 40μm thick CD shells, followed by 1.0 kJ of 1053 nm wavelength, short-pulse energy. Short pulses of 10 ps width have irradiated the inside of a hollow gold re-entrant cone at the time of peak compression. A threefold increase in the time-integrated, 2 to 7 keV x-ray emission was observed with x-ray pinhole cameras, indicating that energy is coupled from the short-pulse laser into the core by fast electrons. In shock-ignition experiments, spherical plastic-shell targets were compressed to high areal densities on a low adiabat, and a strong shock wave was sent into the converging, compressed capsule. In one experiment, 60 beams were used with an intensity spike at the end of the laser pulse, and the implosion performance was studied through neutron-yield and areal-density measurements. In a second experiment, the 60 OMEGA beams were split into a 40+20 configuration, with 40 low-intensity beams used for fuel assembly and 20 delayed beams with a short, high-intensity pulse shape (up to 1×1016 Wcm^-2) for shock generation.},
doi = {},
url = {https://www.osti.gov/biblio/968016}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 24 00:00:00 EST 2009},
month = {Tue Nov 24 00:00:00 EST 2009}
}