Overview of Russian heavy-ion inertial fusion energy program

Sharkov, B.

doi:10.1016/j.nima.2007.02.006

Cited by 27 publications

(11 citation statements)

References 23 publications

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“…5, created by rapid beam spot rotation. We expect the same multi-GHz RF modulation of ion beams as proposed by Sharkov 21 for driving cylindrical heavy-ion targets with a hollow, rotating beam spot can also be applied to provide a hollow beam for heavy-ion direct drive of spherical ablators with mostly oblique incident ion rays. A series of phased RF cavities would be used to impress a helical beam centroid variation upstream of the target before beam drift compression and focusing; this perturbation maps into hollow beam spots on the target with radii controlled by the RF amplitude.…”

Section: Summary and Discussion Of Future Work Neededmentioning

confidence: 93%

Direct drive heavy-ion-beam inertial fusion at high coupling efficiency

2008

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Issues with coupling efficiency, beam illumination symmetry, and Rayleigh-Taylor instability are discussed for spherical heavy-ion-beam-driven targets with and without hohlraums. Efficient coupling of heavy-ion beams to compress direct-drive inertial fusion targets without hohlraums is found to require ion range increasing several-fold during the drive pulse. One-dimensional implosion calculations using the LASNEX inertial confinement fusion target physics code shows the ion range increasing fourfold during the drive pulse to keep ion energy deposition following closely behind the imploding ablation front, resulting in high coupling efficiencies (shell kinetic energy/incident beam energy of 16% to 18%). Ways to increase beam ion range while mitigating Rayleigh-Taylor instabilities are discussed for future work.

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Section: Summary and Discussion Of Future Work Neededmentioning

confidence: 93%

Direct drive heavy-ion-beam inertial fusion at high coupling efficiency

2008

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“…In laser-driven inertial fusion research, a sophisticated smoothing system using distributed phase-plate technology has been developed [3]. Recently, a similar technology using oscillating wobbler fields has been proposed for ion-beam-driven inertial fusion energy [1,[4][5][6][7][8][9][10]] to achieve the desired uniform illumination over an annular region (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Dynamic stabilization of the ablative Rayleigh–Taylor instability for heavy ion fusion

Qin

Davidson

Logan

2014

Nuclear Instruments and Methods in Physics Research Section A:

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Dynamic stabilization of the ablative Rayleigh-Taylor instability of a heavy ion fusion target induced by a beam wobbling system is studied. Using a sharp-boundary model and Courant-Synder theory, it is shown, with an appropriately chosen modulation waveform, that the instability can be stabilized in certain parameter regimes. It is found that the stabilization effect has a strong dependence on the modulation frequency and the waveform.Modulation with frequency comparable to the instability growth rate is the most effective in terms of stabilizing the instability. A modulation with two frequency components can result in a reduction of the growth rate larger than the sum of that due to the two components when applied separately.

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“…T hen less intensity would hit the target normally and one could benefit from oblique / tangential incidence. Wobblers [3,11,12] can rotate ion beams with high frequency. T he oscillatory e ect of the rotation is also assumed to mitigate the growth of instabilities [13].…”

Section: Introductionmentioning

confidence: 99%

Nonuniformity for rotated beam illumination in directly driven heavy-ion fusion

Runge

Logan

2009

Physics of Plasmas

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A bstractA key issue in heavy-ion beam inertial confinement fusion is target interaction, especially implosion symmetry. In this paper the 2D beam irradiation nonuniformity on the surface of a spherical target is studied. This is a first step to studies of 3D dynamical effects on target implosion. So far non-rotated beams have been studied. Because normal incidence may increase Rayleigh-Taylor instabilities, it has been suggested to rotate beams (to increase average uniformity) and hit the target tangentially. The level of beam irradiation uniformity, beam spill and normal incidence is calculated in this paper. In Mathematica the rotated beams are modelled as an annular integrated Gaussian beam. To simplify the chamber geometry, the illumination scheme is not a 4π system, but the beams are arranged on few polar rings around the target. The position of the beam spot rings is efficiently optimized using the analytical model. The number of rings and beams, rotation radii and widths are studied to optimize uniformity and spilled intensity. The results demonstrate that for a 60-beam system on four rings Peak-To-Valley nonuniformities of under 0.5% are possible. * Electronic address:

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Overview of Russian heavy-ion inertial fusion energy program

Cited by 27 publications

References 23 publications

Direct drive heavy-ion-beam inertial fusion at high coupling efficiency

Direct drive heavy-ion-beam inertial fusion at high coupling efficiency

Dynamic stabilization of the ablative Rayleigh–Taylor instability for heavy ion fusion

Nonuniformity for rotated beam illumination in directly driven heavy-ion fusion

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