Abstract
A few % wobbling-beam illumination nonuniformity is realized in heavy ion inertial confinement fusion (HIF) throughout the heavy ion beam (HIB) driver pulse by a newly introduced spiraling beam axis motion in the first two rotations. The wobbling HIB illumination was proposed to realize a uniform implosion in HIF. However, the initial imprint of the wobbling HIBs was a serious problem and 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 produce a time-dependent implosion acceleration, which reduces the Rayleigh-Taylor (R-T) growth [Laser Part. Beams 11, 757 (1993), Nuclear Inst. Methods in Phys. Res. A 606, 152 (2009), Phys. Plasmas 19, 024503 (2012)] and the implosion nonuniformity. The wobbling HIBs can be generated in HIB accelerators and the oscillating frequency may be several 100 MHz ∼ 1 GHz [Phys. Rev. Lett. 104, 254801 (2010)]. Three-dimensional HIBs illumination computations present that the few % wobbling HIBs illumination nonuniformity oscillates with the same wobbling HIBs frequency.
Highlights
Heavy ion beam (HIB) driver has attractive features in inertial confinement fusion (ICF), in high energy density physics and in ion cancer therapy: a heavy ion beam (HIB) pulse shape is controlled precisely to fit various requirements, a HIB axis is controllable in precise, a HIB generation energy efficiency is 30 ∼ 40%, a HIB particle energy deposition is almost classical and the deposition profile is well known
A few % wobbling-beam illumination nonuniformity is realized in heavy ion inertial confinement fusion (HIF) throughout the heavy ion beam (HIB) driver pulse by a newly introduced spiraling beam axis motion in the first two rotations
The wobbling HIB illumination was proposed to realize a uniform implosion in HIF
Summary
Heavy ion beam (HIB) driver has attractive features in inertial confinement fusion (ICF), in high energy density physics and in ion cancer therapy: a HIB pulse shape is controlled precisely to fit various requirements, a HIB axis is controllable in precise, a HIB generation energy efficiency is 30 ∼ 40%, a HIB particle energy deposition is almost classical and the deposition profile is well known. The HIB axis controllability provides a unique tool to smooth the HIB energy deposition nonuniformity, and can introduce wobbling or axis-oscillating HIBs [1, 2]. Our recent work presented that the Rayleigh-Taylor (R-T) instability growth can be reduced significantly by the sinusoidally oscillating HIBs in time and space [3, 4].
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