Speaker
Dr
Akifumi Iwamoto
(National Institute for Fusion Science)
Description
We study fuel layering for Fast Ignition Realization Experiment (FIREX) cryogenic targets according to two strategies: a foam shell and Infrared (IR) heating. Foam is a porous material and would soak up a liquid fuel uniformly by capillarity. The method has the difficulty to form void-less solid fuel because of the density difference between the liquid and solid phases. We have demonstrated the residual void fraction of ~1 % in a foam wedge. ANSYS simulations have represented that the technique would be applicable to a FIREX target. We examine the simulated process using a dummy foam shell target and succeed to form an ice layer with a reduced void fraction. The IR heating technique has originally been developed for central ignition targets, which requires spherical symmetry. We modify it for an axisymmetric FIREX target. We have developed the dedicated layering system with additional temperature control of the cone. To date, the sphericity of a formed ice layer reaches 95 %.
| Country or International Organization | Japan |
|---|---|
| Paper Number | IFE/1-5 |
Primary author
Dr
Akifumi Iwamoto
(National Institute for Fusion Science)
Co-authors
Mr
Keisuke Iwano
(Institute for Laser Engineering, Osaka University)
Dr
Kohei Yamanoi
(Institute for Laser Engineering, Osaka University)
Prof.
Ryousuke Kodama
(Institute for Laser Engineering, Osaka University)
Dr
Shinsuke Fujioka
(Institute of Laser Engineering, Osaka University)
Prof.
Takayoshi Norimatsu
(Institute of Laser Engineering, Osaka University)
