HIB Irradiation on a Direct-Driven Fuel Target in Heavy Ion Fusion

Abstract

Summary form only given. Key issues in heavy ion beam (HIB) inertial confinement fusion (ICF) include an accelerator design for an intense HIB, an efficient HIB transport, HIB space charge neutralization, a HIB-target interaction, a reactor design and so on. In this study we simulate the HIB interaction with a direct-driven target. The main purpose of this study is to clarify the multi-HIB energy deposition non-uniformity onto a direct-driven target. For fixed beam parameters and different reactor chamber radius we investigated the energy deposition non-uniformity using 32 beams irradiation system. The HIB temperature and emittance effects are also evaluated. Moreover we also investigate the pellet temperature effect on the HIB illumination non-uniformity because the temperature of the energy deposition layer increases to a few hundred eV during the HIB illumination. We also investigate the relationship between a chamber radius and the HIB illumination non-uniformity, and study the effect of the total HIB number on the HIB illumination non-uniformity. In an ICF power plant, a position of fuel pellet may shift from a reactor center, because a pellet may be injected from a pellet injection port at a reactor wall. Then the HIB illumination non-uniformity may be influenced by a little pellet displacement from the chamber center. Therefore, we also investigate the relation between the pellet displacement and the HIB illumination non-uniformity. To achieve ignition and high gain in the HIB ICF, the beam illumination non-uniformity on the target is under a few % RMS is required. Therefore we calculate the beam illumination RMS non-uniformity on the target. The calculation results demonstrate that we can realize a sufficiently low non-uniform energy deposition (less than 2%)