First Hohlraum Experiments at the National Ignition Facility

Dewald, E. L.; Suter, L J; Landen, O. L.; Schein, J.; Campbell, Kelly; Schneider, Marilyn; Holder, J. P.; Glenzer, S. H.; McDonald, J.; Niemann, C.; Mackinnon, A. J.; Kalantar, D. H.; Haynam, Christopher A.; Dixit, S.; Foster, J. M.

doi:10.1109/plasma.2005.359333

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“…Indirect drive inertial confinement fusion (ICF) has received a great deal of attention in the last few decades as one of the most promising schemes to reach controlled fusion in the laboratory (Lindl et al, 2004;Dewald et al, 2005) and large laser facilities such as the National Ignition Facility (Haynam et al, 2008), and laser megajoule project (Fleurot et al, 2005) aim to reach breakeven using this scheme within the next few years. In the basic scheme, a microsphere of fuel (typically a mixture of deuterium and tritium) (Cook et al, 2008;Chatain et al, 2008;Moreau et al, 2009) is placed inside a metallic cavity (hohlraum) and a large number of long and energetic laser pulses are focused onto the inner surface of the cavity.…”

Section: Introductionmentioning

confidence: 99%

“…However, diagnosing laser interaction and plasma expansion in the interior of the hohlraum presents obvious problems due to the enclosed nature of the target, and measurements have been mainly indirect, and of limited detail (Lindl et al, 2004;Dewald et al, 2005;Kauffman et al, 1998;Haan et al, 2007). Optimum conditions can therefore only be determined via an empirical, experimental approach.…”

Section: Introductionmentioning

confidence: 99%

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Progress in proton radiography for diagnosis of ICF-relevant plasmas

et al. 2010

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Proton radiography using laser-driven sources has been developed as a diagnostic since the beginning of the decade, and applied successfully to a range of experimental situations. Multi-MeV protons driven from thin foils via the Target Normal Sheath Acceleration mechanism, offer, under optimal conditions, the possibility of probing laser-plasma interactions, and detecting electric and magnetic fields as well as plasma density gradients with ps temporal resolution and 5-10 mm spatial resolution. In view of these advantages, the use of proton radiography as a diagnostic in experiments of relevance to Inertial Confinement Fusion is currently considered in the main fusion laboratories. This paper will discuss recent advances in the application of laser-driven radiography to experiments of relevance to Inertial Confinement Fusion. In particular we will discuss radiography of hohlraum and gasbag targets following the interaction of intense ns pulses. These experiments were carried out at the HELEN laser facility at AWE (UK), and proved the suitability of this diagnostic for studying, with unprecedented detail, laser-plasma interaction mechanisms of high relevance to Inertial Confinement Fusion. Non-linear solitary structures of relevance to space physics, namely phase space electron holes, have also been highlighted by the measurements. These measurements are discussed and compared to existing models.

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