Material Issues of Blanket Systems for Fusion Reactors-Compatibility with Cooling Water-

Miwa, Yukio; Tsukada, Takashi; Jitsukawa, Shiro

doi:10.1585/jspf.80.551

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…In future work, we will investigate the existence and impacts of phase-space structures in ITG turbulence, in both theory/simulation, and in experiment with simplified geometry [69] . In particular the trapped-ion mode is a good candidate to detect phase-space structure dynamics.…”

Section: Discussionmentioning

confidence: 99%

Recent progress on phase-space turbulence and dynamical response in collisionless plasmas

Lesur

2013

Preprint

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In the presence of wave dissipation, phase-space structures emerge in nonlinear Vlasov dynamics. Their dynamics can lead to a nonlinear continuous shifting of the wave frequency (chirping). This report summarizes my personal contribution to these topics in the fiscal year 2012. The effects of collisions on chirping characteristics were investigated, with a one-dimensional beam-plasma kinetic model. The long-time nonlinear evolution was systematically categorized as damped, steady-state, periodic, chaotic and chirping. The chirping regime was sub-categorized as periodic, chaotic, bursty, and intermittent. Existing analytic theory was extended to account for Krook-like collisions. Relaxation oscillations, associated with chirping bursts, were investigated in the presence of dynamical friction and velocity-diffusion. The period increases with decreasing drag, and weakly increases with decreasing diffusion. A new theory gives a simple relation between the growth of phase-space structures and that of the wave energy. When dissipation is modeled by a linear term in the field equation, simple expressions of a single hole growth rate and of the initial perturbation threshold are in agreement with numerical simulations.

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Section: Discussionmentioning

confidence: 99%

Recent progress on phase-space turbulence and dynamical response in collisionless plasmas

Lesur

2013

Preprint

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“…Intergranular corrosion is usually associated with chemical segregation effects (impurities have a tendency to be enriched at grain boundaries) or specific phases precipitated on the grain boundaries. Such precipitation can produce zones of reduced corrosion resistance in the immediate vicinity [10]. For sensitized stainless steels, Cr has a tendency to be enriched at grain boundaries thus lead to a local depletion of Cr immediately adjacent to these Cr precipitates, which provides a selective path for intergranular corrosion by specific media, such as oxidizing (nitric, chromic).…”

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confidence: 99%

Positron microscopic analysis of crack failure in stainless steels

Maekawa

Miwa

et al. 2007

Phys. Status Solidi (c)

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Employing a focused positron beam with a lateral resolution of approximately 30 µm, we performed two dimensional scanning studies of stainless steels with stress corrosion cracking (SCC). A stainless steel with fatigued crack was also measured for comparison. Results suggest a quite unique failure mechanism for the specimen with SCC. In contrast to normal crack propagation effect associated with vacancies and dislocations, smaller Doppler broadening line shape (S) parameters were observed around the SCC crack tip than those corresponding to the undamaged area. It could be ascribed to some chemical influences, like oxidation, took place at grain boundaries.

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Effect of Hydrogen on Crack Growth Behavior in F82H Steel Using Small-Size Specimen

Ito

Saito

Abe

et al. 2014

Small Specimen Test Techniques: 6th Volume

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Material Issues of Blanket Systems for Fusion Reactors-Compatibility with Cooling Water-

Cited by 3 publications

References 24 publications

Recent progress on phase-space turbulence and dynamical response in collisionless plasmas

Recent progress on phase-space turbulence and dynamical response in collisionless plasmas

Positron microscopic analysis of crack failure in stainless steels

Effect of Hydrogen on Crack Growth Behavior in F82H Steel Using Small-Size Specimen

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