Studies on heavy ion fusion and high energy density physics in Japan

Kawata, Shigeo; Horioka, Kazuhiko; Murakami, M.; Oguri, Y.; Hasegawa, Jun; Takayama, Ken; Yoneda, Hitoki; Miyazawa, K.; Someya, T.; Ogoyski, A.I.; Seino, M.; Kikuchi, Takashi; Kawamura, T.; Ogawa, Masahiro

doi:10.1016/j.nima.2007.02.007

Cited by 12 publications

(6 citation statements)

References 48 publications

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“…The project overview in HIF-VNL [91] shows that they focus on the HIB accelerator physics. The FAIR (Facility for Antiprotons and Ion Research) project has started at Darmstadt, Germany [29,92]. FAIR is oriented to basic physics to understand the structure of matter, the evolution of the universe, etc.…”

Section: Hif Research Projectsmentioning

confidence: 99%

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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Section: Hif Research Projectsmentioning

confidence: 99%

Review of heavy-ion inertial fusion physics

Kawata

Karino

Ogoyski

2016

Matter and Radiation at Extremes

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“…The other is a lead-aluminum pellet structure with the same external radius, as shown in Fig. 2 [5] . Both have an external radius of 4 mm and a total layer thickness of 1 mm.…”

Section: Simulation Modelmentioning

confidence: 99%

“…Each beamlet deposits its energy on space meshes of the spherical target as shown in Figs. 3(a) and (b) [5] , then the total energy deposition is obtained and the deposition uniformity is evaluated. The deposition energy of one HIB in one mesh is calculated by [5] ,…”

Section: Deposition-energy Calculation Proceduresmentioning

confidence: 99%

Non-Uniformity of Heavy-Ion Beam Irradiation on a Direct-Driven Pellet in Inertial Confinement Fusion

Gholamzadeh

Ghasemizad

2011

Plasma Sci. Technol.

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Heavy-ion-driven fusion (HIF) is a scheme to achieve inertial confinement fusion (ICF). Investigation of the non-uniformity of heavy-ion beam (HIB) irradiation is one of the key issues for ICF driven by powerful heavy-ion beams. Ions in HIB impinge on the pellet surface and deposit their energy in a relatively deep and wide area. Therefore, the non-uniformity of HIB irradiation should be evaluated in the volume of the deposition area in the absorber layer. By using the OK1 code with some corrections, the non-uniformity of heavy-ion beam irradiation for the different ion beams on two kinds of targets were evaluated in 12-beam, 20-beam, 60-beam and 120-beam irradiation schemes. The root-mean-square (RMS) non-uniformity value becomes σRMS = 8.39% in an aluminum mono-layer pellet structure and σRMS = 6.53% in a lead-aluminum layer target for the 12-uranium-beam system. The RMS non-uniformity for the lead-aluminum layer target was lower than that for the mono-layer target. The RMS and peak-to-valley (PTV) non-uniformities are reduced with the increase in beam number, and low at the Bragg peak layer.

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“…The calculation of the stopping force, which is the force exerted by a moving charged projectile on itself through the perturbation of the surrounding plasma, is a classic problem, with applications spanning from fusion [1][2][3] to dusty plasmas [4][5][6][7][8]. In the linear perturbation approximation, the calculation of the stopping force is straightforward once the dielectric function is specified and the projectile velocity is assumed to be constant [1,9]; for a cold plasma, it results in the Bohr stopping force [1,10].…”

Section: Introductionmentioning

confidence: 99%

Stopping power: Effect of the projectile deceleration

2014

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The stopping force is the force exerted on a charged projectile by the excess charge of the wake generated by the projectile in the surrounding plasma. Since the wake does not instantly adjust to the projectile velocity, the stopping force should be affected by the projectile deceleration caused by the stopping force itself. We address this effect by deriving the corresponding correction to the stopping force in a cold plasma. We find that if the projectile is an ion, the correction is small when the stopping force is due to the plasma electrons, but can be significant when the stopping force is due to the ions.

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Studies on heavy ion fusion and high energy density physics in Japan

Cited by 12 publications

References 48 publications

Review of heavy-ion inertial fusion physics

Review of heavy-ion inertial fusion physics

Non-Uniformity of Heavy-Ion Beam Irradiation on a Direct-Driven Pellet in Inertial Confinement Fusion

Stopping power: Effect of the projectile deceleration

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