Wobblers and Rayleigh–Taylor instability mitigation in HIF target implosion

Kawata, Shigeo; Kurosaki, T.; Noguchi, Kenta; Suzuki, Tomohiro; Koseki, Shunsuke; Barada, Daisuke; Ma, Yunlong; Ogoyski, A.I.; Barnard, J.J.; Logan, B.G.

doi:10.1016/j.nima.2013.05.066

Cited by 7 publications

(9 citation statements)

References 23 publications

(41 reference statements)

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“…On a fundamental level, the primary requirement for the RT instability is that a less dense fluid should be accelerated into a more dense fluid. 22,23 This interface destabilization between two fluids can be achieved in a number of different ways, 21 as evident by the large number of examples from an extremely diverse range of systems, including in astronomical structures such as black holes and supernova, [24][25][26] geophysical phenomenon, 27,28 fusion, [29][30][31][32] and bulk fluid-fluid interfaces. [33][34][35] The new idea proposed in this work is based on the interesting thermal behavior found when a film-fluid interface is heated rapidly by short laser pulses, with the fluid being converted into gas.…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials synthesis by a novel phenomenon: The nanoscale Rayleigh-Taylor instability

Yadavali

Kalyanaraman

2014

AIP Advances

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The Rayleigh-Taylor (RT) interfacial instability has been attributed to physical phenomenon in a wide variety of macroscopic systems, including black holes, laser generated plasmas, and thick fluids. However, evidence for its existence in the nanoscale is lacking. Here we first show theoretically that this instability can occur in films with thickness negligible compared to the capillary length when they are heated rapidly inside a bulk fluid. Pressure gradients developed in the evaporated fluid region produce large forces causing the instability. Experiments were performed by melting Au films inside glycerol fluid by nanosecond laser pulses. The ensuing nanoparticles had highly monomodal size distributions. Importantly, the spacing of the nanoparticles was independent of the film thickness and could be tuned by the magnitude of the pressure gradients. Therefore, this instability can overcome some of the limitations of conventional thin self-organization techniques that rely on film thickness to control length scales.

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Section: Introductionmentioning

confidence: 99%

Nanomaterials synthesis by a novel phenomenon: The nanoscale Rayleigh-Taylor instability

Yadavali

Kalyanaraman

2014

AIP Advances

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“…In Refs. [31,42], 32 HIBs axes oscillate spirally from the initial axis positions shown in Figure 6(a). After around one rotation, each HIB rotates along the circle trajectory.…”

Section: Energy Release In Heavy Ion Inertial Fusionmentioning

confidence: 88%

“…HIB accelerators can oscillate the HIB axis with a high frequency ~100 MHz-1 GHz [24][25][26]. The axis-oscillating or wobbling HIB also provides a unique tool to smooth the HIBs illumination non-uniformity in the HIF target implosion [31,42,43,46]. The wobbling HIBs are applied to smooth HIBs illumination non-uniformity in fuel target implosion.…”

Section: Energy Release In Heavy Ion Inertial Fusionmentioning

confidence: 99%

“…The dynamic smoothing mechanism was applied to the HIF target implosion to smooth the HIBs illumination non-uniformity by the spirally axis-oscillating HIBs [31,42]. Figure 12 shows a schematic diagram of the HIB rotation or wobbling behavior.…”

Section: Energy Release In Heavy Ion Inertial Fusionmentioning

confidence: 99%

“…The high-density fuel compression is a major challenge in ICF. HIB accelerators also provide a unique feature of the HIB axis wobbling behavior, which mitigates the HIBs illumination non-uniformity [11,31,42,43]. Multiple driver beams irradiate an ICF fuel target.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Direct-drive heavy ion beam inertial confinement fusion: a review, toward our future energy source

Kawata

2021

Advances in Physics: X

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Direct-drive heavy ion beam (HIB) inertial confinement fusion (ICF), or HIF would be a promising future energy source for society. Particle accelerators produce HIBs with precise particle energies, pulse lengths and pulse shapes with high energy efficiencies of ~30-40%. Higher energy driver efficiency means that a lower fusion energy output is required to construct a HIF power station to supply ~1 GW of electricity. A HIF power station could use about 4 to 5 MJ of HIB energy per shot at a shot rate of ~10 Hz. This review is focused on the direct-drive scheme in HIF. In directdrive fuel target HIBs deposit their energy into a shell surrounded by a denser tamping outer layer. The DT (Deuterium-Tritium) fusion fuel, with a total mass of several mg, must be compressed to about one thousand times solid density to reduce the input driver energy and to achieve an adequate burn fraction. Highdensity compression is a major challenge in ICF, requiring that non-uniformity in driver energy deposition be kept lower than a few percent. The axis of an HIB can be made to oscillate sufficiently rapidly to improve the uniformity of energy deposition.

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Review of heavy-ion inertial fusion physics

Kawata

Karino

Ogoyski

2016

Matter and Radiation at Extremes

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In this review paper on heavy ion inertial fusion (HIF), the state-of-the-art scientific results are presented and discussed on the HIF physics, including physics of the heavy ion beam (HIB) transport in a fusion reactor, the HIBs-ion illumination on a direct-drive fuel target, the fuel target physics, the uniformity of the HIF target implosion, the smoothing mechanisms of the target implosion nonuniformity and the robust target implosion. The HIB has remarkable preferable features to release the fusion energy in inertial fusion: in particle accelerators HIBs are generated with a high driver efficiency of ~ 30-40%, and the HIB ions deposit their energy inside of materials. Therefore, a requirement for the fusion target energy gain is relatively low, that would be ~50-70 to operate a HIF fusion reactor with the standard energy output of 1GW of electricity. The HIF reactor operation frequency would be ~10~15 Hz or so. Several-MJ HIBs illuminate a fusion fuel target, and the fuel target is imploded to about a thousand times of the solid density. Then the DT fuel is ignited and burned. The HIB ion deposition range is defined by the HIB ions stopping length, which would be ~1 mm or so depending on the material. Therefore, a relatively large density-scale length appears in the fuel target material. One of the critical issues in inertial fusion would be a spherically uniform target compression, which would be degraded by a non-uniform implosion. The implosion non-uniformity would be introduced by the Rayleigh-Taylor (R-T) instability, and the large density-gradient-scale length helps to reduce the R-T growth rate. On the other hand, the large scale length of the HIB ions stopping range suggests that the temperature at the energy deposition layer in a HIF target does not reach a very-high temperature: normally the about 300eV or so is realized in the energy absorption region, and that a direct-drive target would be appropriate in HIF. In addition, the HIB accelerators are operated repetitively and stably. The precise control of the HIB axis manipulation is also realized in the HIF accelerator, and the HIB wobbling motion may give another tool to smooth the HIB illumination non-uniformity. The key issues in HIF physics are also discussed and presented in the paper.

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Wobblers and Rayleigh–Taylor instability mitigation in HIF target implosion

Cited by 7 publications

References 23 publications

Nanomaterials synthesis by a novel phenomenon: The nanoscale Rayleigh-Taylor instability

Nanomaterials synthesis by a novel phenomenon: The nanoscale Rayleigh-Taylor instability

Direct-drive heavy ion beam inertial confinement fusion: a review, toward our future energy source

Review of heavy-ion inertial fusion physics

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