Fabrication of disk-shaped, deuterated resorcinol/formaldehyde foam target for laser–plasma experiments

Abstract

Resorcinol/formaldehyde (RF) foam resin is an attractive material as a low-density target in high-power laser–plasma experiments because of its fine network structure, transparency in the visible region, and low-Z element (hydrogen, carbon, and oxygen) composition. In this study, we developed disk-shaped RF foam and deuterated RF foam targets with 40–200 μm thickness and approximately 100 mg/cm3 density having a network structure from 100 nm to a few micrometers cell size. By deuteration, the polymerization rate was drastically slowed down owing to kinetic isotope effects. These targets were used in high-power laser experiments where a megaelectronvolt proton beam was successfully generated.

Fabrication of high-concentration Cu-doped deuterated targets for fast ignition experiments

“…For this purpose, copper (II) oleate [Cu(C 18 H 33 O 2 ) 2 , Cu-oleate] microsphere targets are fabricated with Cu contents of 9.7 wt% [11]. In addition, deuterated polystyrene targets [22] can generate neutrons during IFE experiments; these allow investigation of the fusion reaction as well as the temperature of the compressed core. Cuoleate and deuterated polystyrene microsphere targets are usually fabricated by the emulsion method [23,24].…”