Observation of a reflected shock in an indirectly driven spherical implosion at the national ignition facility.
نویسندگان
چکیده
A 200 μm radius hot spot at more than 2 keV temperature, 1 g/cm^{3} density has been achieved on the National Ignition Facility using a near vacuum hohlraum. The implosion exhibits ideal one-dimensional behavior and 99% laser-to-hohlraum coupling. The low opacity of the remaining shell at bang time allows for a measurement of the x-ray emission of the reflected central shock in a deuterium plasma. Comparison with 1D hydrodynamic simulations puts constraints on electron-ion collisions and heat conduction. Results are consistent with classical (Spitzer-Harm) heat flux.
منابع مشابه
Observation of a Reflected Shock in an Indirectly Driven Spherical Implosion at the National Ignition Facility Citation
Citation Le Pape, S., L. Divol, L. Berzak Hopkins, A. Mackinnon, N. B. Meezan, D. Casey, J. Frenje, et al. “Observation of a Reflected Shock in an Indirectly Driven Spherical Implosion at the National Ignition Facility.” Physical Review Letters 112, no. 22 (June 2014). © 2014 American Physical Society As Published http://dx.doi.org/10.1103/PhysRevLett.112.225002 Publisher American Physical Society
متن کاملHot-Core Characterization of a Cryogenic D2 Target at Peak Neutron Production in a Direct-Drive Spherical Implosion
LLE Review, Volume 97 11 In inertial confinement fusion1 (ICF), a spherical shell is irradiated either directly by a large number of overlapping laser beams (direct drive) or by x rays produced in a high-Z “hohlraum” (indirect drive).2 During the laser-driven acceleration phase of an implosion, the target compresses while it converges to the center, then decelerates to peak compression as the c...
متن کاملImproved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive.
Hydrodynamic instabilities can cause capsule defects and other perturbations to grow and degrade implosion performance in ignition experiments at the National Ignition Facility (NIF). Here, we show the first experimental demonstration that a strong unsupported first shock in indirect drive implosions at the NIF reduces ablation front instability growth leading to a 3 to 10 times higher yield wi...
متن کاملVelocity and timing of multiple spherically converging shock waves in liquid deuterium.
The fuel entropy and required drive energy for an inertial confinement fusion implosion are set by a sequence of shocks that must be precisely timed to achieve ignition. This Letter reports measurements of multiple spherical shock waves in liquid deuterium that facilitate timing inertial confinement fusion shocks to the required precision. These experiments produced the highest shock velocity o...
متن کاملThe saturn target for polar direct drive on the national ignition facility.
A new target design concept is proposed for direct-drive implosions while the National Ignition Facility is in its initial, indirect-drive configuration. It differs from earlier "polar-direct-drive" designs by adding a low-Z ring around the capsule equator. Refraction in the plasma formed around this ring permits time-dependent tuning of the capsule drive uniformity. An optimized simulation sho...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 112 22 شماره
صفحات -
تاریخ انتشار 2014