Abstract
The Shock Ignition (SI) scheme (1) offers to reduce the laser requirements by relaxing the implosion phase to sub-ignition velocities and later adding an intense laser spike. Depending on laser energy, target characteristics and implosion velocity, high gains are expected (2, 3). Relevant intensities for scaled targets imploded in the velocity range from 150 to 400km/s are defined at ignition thresholds. A range of moderate implosion velocities is specified to match safe implosions. These conditions for target design are then inferred for relevant NIF and LMJ shock-ignited targets.
Highlights
In Inertial Confinement Fusion (ICF), the thermonuclear fuel is imploded and assembled by a shaped laser pulse
Relevant intensities for scaled targets imploded in the velocity range from 150 to 400 km/s are defined at ignition thresholds
The hot spot ignition conditions at stagnation time depend on both the implosion velocity set by the main drive and the laser power dedicated to the spike generation
Summary
In Inertial Confinement Fusion (ICF), the thermonuclear fuel is imploded and assembled by a shaped laser pulse This process involves high implosion velocities (350–400 km/s) in order to both compress and heat the fuel up to trigger ignition into the hot spot. The SI scheme enables the ignition to occur while relaxing the implosion phase to sub-ignition velocities (200–350 km/s) and launching a high pressure spike (100–300 TW) at the end of the main drive stage. This spike pulse will generate a shock that will converge through the precompressed target and set the final assembly on a non-isobaric configuration. The optimal implosion parameters for shock ignited target designs are discussed
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