Diamond Ablators for Inertial Confinement Fusion

Abstract

Diamond has a unique combination of physical properties for the inertial confinement fusion ablator application, such as appropriate optical properties, high atomic density, high yield strength, and high thermal conductivity. Here, we present a feasible concept to fabricate diamond ablator shells. The fabrication of diamond capsules is a multi-step process, which involves diamond chemical vapor deposition on silicon mandrels followed by polishing, microfabrication of holes, and removing of the silicon mandrel by an etch process. We also discuss the pros and cons of coarse-grained optical quality and nanocrystalline chemical vapor deposition diamond films for the ablator application.2

National Ignition Facility target design and fabrication

“…In closing this section it should be noted that graded, Ge-doped CH designs exist and that capsules meeting these specifications have also been successfully fabricated (Chen et al, 2006(Chen et al, , 2007Theobald et al, 2007). We also note that good progress is being made on a high density carbon capsule via diamond chemical vapor deposition techniques (Biener et al, 2006).…”

Thick Nano-Crystalline Diamond films for fusion applications

“…Diamonds have many outstanding material properties which make them interesting for many industries. Possible applications are antiwear coatings, optical windows, fusion targets and electrochemical electrodes which translates in the following physical properties: high hardness, chemical inert, high thermal conductivity, high atomic density, high yield strength and thermal stability [4,3,31,72]. For producing articial diamonds chemical vapor deposition (CVD) or High Pressure High Temperature synthesis is used.…”

“…the band with of the G band 3. the D/G integrated intensity ratio 4. the band with of the second order phonon at 2700 cm −1 Sails R. S. uses a similar technique to obtain some diamond indices in [59], which has an higher emphasis on the diamond peak.…”

Diagnosing ablator ρR and ρR asymmetries in capsule implosions using charged-particle spectrometry at the National Ignition Facility

“…3,4,[21][22][23][24][25] The first design is made of beryllium ͑Be͒, doped gradually with copper; the second design is made of CH, doped gradually with germanium; the third design, which is not discussed in this paper, is made of highdensity carbon. At least three ablator designs are under consideration.…”