Low-Density-Plastic-Foam Capsule of Resorcinol/Formalin and (Phloroglucinolcarboxylic Acid)/Formalin Resins for Fast-Ignition Realization Experiment (FIREX) in Laser Fusion Research

Abstract

Additions to the Spectra Lila, Lizb and LiZla.Six new spectral lines have been observed in the lithium spectrum between 200 nm and 600 nm. Possible classifications are given and discussed.

A review of low density porous materials used in laser plasma experiments

“…An emulsion process is used for the production of these shells. 58 Viscosity control is crucial to controlling the thinness of the walls of these shells, 114 density matching method also plays an important part to achieve these high specifications. 115,116 In order to keep such a density matching and temperature independent reaction process, the phase transfer catalyst is a useful method.…”

Recent progress of fuel layering study for FIREX cryogenic target

“…The foam shell is still under development and several prototype~500 m shells with~20 m foam layer thickness were fabricated. A resorcinol/formalin (RF) material was utilized to create a 500 m foam shell [5]. Machining of the shells to make a hole for a conical laser guide and full tube insertion has been stable [6].…”

Final report SI 08-SI-004: Fusion application targets

“…Although 20-micron-thick shells have been produced for fast-ignition experiments, they are too dense (>130 mg/cc), mechanically very unstable and thus difficult to dry, and showed large deviations from roundness. 8,10 To explore the spin-coating behavior of RF gels that is essential to our approach, we performed gelation tests in a rotating cylinder geometry. The observed formation of uniform and transparent gel layers ( Figure 4) seems to be a consequence of the 1000-fold increase of the viscosity near the gel point of the RF solution that keeps the shear forces experienced by the gelling film low.…”

“…Much effort has been directed over the last 20 years toward the development of spherical foam targets for direct-drive 1-7 and fast-ignition [8][9][10] experiments. In these targets, the spherical foam shell is used to define the shape of the cryogenic DT fuel layer, 11 or acts as a surrogate to simulate the cryogenic fuel layer.…”

“…These targets are fabricated from relatively high-density aerogels (>100 mg/cc) and coated with a few micron thick permeation barrier. With exception of the above mentioned fast ignition targets, [8][9][10] the wall of these targets is typically larger than 100 microns. In contrast, the fusion application targets for indirect-drive experiments on NIF will require a much thinner foam shell surrounded by a much thicker ablator shell.…”