Demonstration of the shock-timing technique for ignition targets on the National Ignition Facility

Boehly, T. R.; Munro, D.; Celliers, P. M.; Olson, R. E.; Hicks, D. G.; Goncharov, V. N.; Collins, G. W.; Robey, H. F.; Hu, S. X.; Morozas, J. A.; Sangster, T. C.; Landen, O. L.; Meyerhofer, D. D.
May 2009
Physics of Plasmas;May2009, Vol. 16 Issue 5, p056302
Academic Journal
A high-performance inertial confinement fusion capsule is compressed by multiple shock waves before it implodes. To minimize the entropy acquired by the fuel, the strength and timing of those shock waves must be accurately controlled. Ignition experiments at the National Ignition Facility (NIF) will employ surrogate targets designed to mimic ignition targets while making it possible to measure the shock velocities inside the capsule. A series of experiments on the OMEGA laser facility [Boehly et al., Opt. Commun. 133, 495 (1997)] validated those targets and the diagnostic techniques proposed. Quartz was selected for the diagnostic window and shock-velocity measurements were demonstrated in Hohlraum targets heated to 180 eV. Cryogenic experiments using targets filled with liquid deuterium further demonstrated the entire timing technique in a Hohlraum environment. Direct-drive cryogenic targets with multiple spherical shocks were used to further validate this technique, including convergence effects at relevant pressures (velocities) and sizes. These results provide confidence that shock velocity and timing can be measured in NIF ignition targets, allowing these critical parameters to be optimized.


Related Articles

  • Comment on 'Species separation in inertial confinement fusion fuels' [Phys. Plasmas 20, 012701 (2013)]. Larroche, O. // Physics of Plasmas;Apr2013, Vol. 20 Issue 4, p044701 

    A recent paper presents numerical simulations of shock waves in a two-ion-component plasma, investigating how species separation occurring in the latter can affect the nuclear fusion yield of inertial confinement fusion targets. Here, it is shown that an important physical mechanism has...

  • Implosion of reactor-size, gas-filled spherical shell targets driven by shaped pressure pulses. Piriz, A. R.; Atzeni, S. // Physics of Fluids B: Plasma Physics;May93, Vol. 5 Issue 5, p1605 

    The implosion of a family of reactor-size targets for inertial confinement fusion (ICF) is studied analytically and numerically. The targets consist of a deuterium–tritium (D–T) shell filled with D–T vapor and they are imploded by a multistep pressure pulse designed in such...

  • Computational study of laser imprint mitigation in foam-buffered inertial confinement fusion.... Mason, R.J.; Kopp, R.A. // Physics of Plasmas;Jan1998, Vol. 5 Issue 1, p211 

    Focuses on the computational study of laser imprint mitigation in foam-buffered inertial confinement fusion targets. Components of the targets; Purpose of foam-buffering; Calculations of foam-buffered target dynamics.

  • Neutron penumbral imaging of inertial confinement fusion targets at Phebus. Delage, O.; Garconnet, J.-P.; Schirmann, D.; Rouyer, A. // Review of Scientific Instruments;Feb1995, Vol. 66 Issue 2, p1205 

    Reports on the neutron penumbral imaging of inertial confinement fusion targets at the Phebus laser facility at Central d'Etudes de Limeil-Valenton in France. Deconvolution of the penumbral images; Description of the penumbral imaging system; Image reconstruction; Wiener filter approximation...

  • A ring coded-aperture microscope for high-resolution imaging of high-energy x rays. Ress, D.; Ciarlo, D. R.; Stewart, J. E.; Bell, P. M.; Kania, D. R. // Review of Scientific Instruments;Oct92, Vol. 63 Issue 10, p5086 

    We use annular apertures to produce coded images of inertial-confinement fusion targets. The images are formed with 4-9-keV x rays; they are unfolded to obtain high-quality estimates of the source spatial distribution. Excellent time-integrated images have been obtained using x-ray film as a...

  • Development and characterization of a Z-pinch-driven hohlraum high-yield inertial confinement fusion target concept. Cuneo, Michael E.; Vesey, Roger A.; Porter, John L.; Chandler, Gordon A.; Fehl, David L.; Gilliland, Terrance L.; Hanson, David L.; McGurn, John S.; Reynolds, Paul G.; Ruggles, Laurence E.; Seamen, Hans; Spielman, Rick B.; Struve, Ken W.; Stygar, William A.; Simpson, Walter W.; Torres, Jose A.; Wenger, David F.; Hammer, James H.; Rambo, Peter W.; Peterson, Darrell L. // Physics of Plasmas;May2001, Vol. 8 Issue 5, p2257 

    Initial experiments to study the Z-pinch-driven hohlraum high-yield inertial confinement fusion (ICF) concept of Hammer, Tabak, and Porter [Hammer et al., Phys. Plasmas 6, 2129 (1999)] are described. The relationship between measured pinch power, hohlraum temperature, and secondary hohlraum...

  • Thermal filamentation in plasmas with nonlocal thermal conductivity. Schmitt, Andrew J. // Physics of Fluids B: Plasma Physics;Mar93, Vol. 5 Issue 3, p932 

    Thermal filamentation and self-focusing of laser light has been shown to be significantly altered in typical inertial confinement fusion (ICF)-type laser plasmas because of heat flux inhibition associated with nonlocal electron thermal conduction. The conductivity becomes appreciably nonlocal...

  • Studies of ultra-intense laser plasma interactions for fast ignition. Tanaka, K. A.; Kodama, R.; Fujita, H.; Heya, M.; Izumi, N.; Kato, Y.; Kitagawa, Y.; Mima, K.; Miyanaga, N.; Norimatsu, T.; Pukhov, A.; Sunahara, A.; Takahashi, K.; Allen, M.; Habara, H.; Iwatani, T.; Matusita, T.; Miyakosi, T.; Mori, M.; Setoguchi, H. // Physics of Plasmas;May2000, Vol. 7 Issue 5, p2014 

    Investigates laser plasma interactions in a relativistic parameter regime for the possibility of fast ignition in inertial confinement fusion. Use of ultra-intense laser systems and particle-in-cell simulation codes; Focus on energy transport of hot electrons; Concept of fast ignition.

  • Generation of high pressure shocks relevant to the shock-ignition intensity regime. Batani, D.; Antonelli, L.; Atzeni, S.; Badziak, J.; Baffigi, F.; Chodukowski, T.; Consoli, F.; Cristoforetti, G.; De Angelis, R.; Dudzak, R.; Folpini, G.; Giuffrida, L.; Gizzi, L. A.; Kalinowska, Z.; Koester, P.; Krousky, E.; Krus, M.; Labate, L.; Levato, T.; Maheut, Y. // Physics of Plasmas;Mar2014, Vol. 21 Issue 3, p1 

    An experiment was performed using the PALS laser to study laser-target coupling and laser-plasma interaction in an intensity regime ≤1016 W/cm², relevant for the "shock ignition" approach to Inertial Confinement Fusion. A first beam at low intensity was used to create an extended...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics