[en] In an actual inertial fusion reactor, a fuel target alignment error may happen; the target alignment error induces heavy ion beam illumination non-uniformity on the target. The beam illumination non-uniformity leads a degradation of fusion energy output. On the other hand, heavy ion beam accelerator provides a capability to oscillate beam axis with a high frequency. The wobbling beams may provide a new method to reduce or smooth the beam illumination non-uniformity. In this paper, we focus on the wobbler illumination non-uniformity onto a spherical target. We found that the tolerable displacement of the target illuminated by the wobbling ion beams is about 80 ∼ 90 μm in a fusion reactor. (author)

[en] A few % wobbling-beam illumination nonuniformity is realized in heavy ion inertial confinement fusion (HIF) by a spiraling beam axis motion. So far the wobbling heavy ion beam (HIB) illumination was proposed to realize a uniform implosion in HIF. However, the initial imprint of the wobbling HIBs introduces a large unacceptable energy deposition nonuniformity. In the wobbling HIBs illumination, the illumination nonuniformity oscillates in time and space. The oscillating-HIB energy deposition may contribute to the reduction of the HIBs' illumination nonuniformity. The wobbling HIBs can be generated in HIB accelerators and the oscillating frequency may be several 100 MHz ∼ 1 GHz. Three-dimensional HIBs illumination computations presented here show that the few % wobbling HIBs illumination nonuniformity oscillates successfully with the same wobbling HIBs frequency. (author)