Relativistic Plasma Physics. 7. Relativistic Particle Acceleration as Origin of Cosmic Ray.

真弘, 星野

doi:10.1585/jspf.78.668

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…The IMPMC code has been developed [18], and recently it was employed in the integrated SONIC code [19]. SONIC simulation has been applied to investigate the plasma detachment in JT-60U experiments [20] and to design the divertor geometry in JT-60SA [21]. Validation of the SOLDOR/NEUT2D package was confirmed by benchmarking with the B2.5-EIREENE (SOLPS5.0) code [22].…”

Section: Sonic Simulation and Developmentsmentioning

confidence: 99%

A simulation study of large power handling in the divertor for a Demo reactor

et al. 2013

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Power exhaust for a 3 GW class fusion reactor with an ITER-sized plasma was investigated by enhancing the radiation loss from seeding impurity. The impurity transport and plasma detachment were simulated under the Demo divertor condition using an integrated divertor code SONIC, in which the impurity Monte-Carlo code, IMPMC, can handle most kinetic effects on the impurity ions in the original formula. The simulation results of impurity species from low Z (neon) to high Z (krypton) and divertor length with a plasma exhausted power of 500 MW and radiation loss of 460 MW, and a fixed core–edge boundary of 7 × 1019 m−3 were investigated at the first stage for the Demo divertor operation scenario and the geometry design. Results for the different seeding impurities showed that the total heat load, including the plasma transport and radiation , was reduced from 15–16 MW m−2 (Ne and Ar) to 11 MW m−2 for the higher Z (Kr), and extended over a wide area accompanied by increasing impurity recycling. The geometry effect of the long-leg divertor showed that full detachment was obtained, and the peak qtarget value was decreased to 12 MW m−2, where neutral heat load became comparable to and due to smaller flux expansion. Fuel dilution was reduced but was still at a high level. These results showed that a divertor design with a long leg with higher Z seeding such as Ar and Kr is not fulfilled, but will be appropriate to obtain the divertor scenario for the Demo divertor. Finally, influences of χ and D⊥ enhancement were seen significantly in the divertor, i.e. the radiation and density profiles became wider, leading to full detachment. Both qtarget near the separatrix and Te at the outer flux surfaces were decreased to a level for the conventional technology design. On the other hand, the problem of fuel dilution became worse. Extrapolation of the plasma transport coefficients to ITER and Demo, where density and temperature will be higher than ITER and edge-localized modes are mitigated, is a key issue for the divertor design.

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Section: Sonic Simulation and Developmentsmentioning

confidence: 99%

A simulation study of large power handling in the divertor for a Demo reactor

et al. 2013

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“…Various SOL-divertor plasma code packages, therefore, have been developed and benchmarked with experimental results such as SOLPS (B2-EIRENE) [1], SONIC [2,3] and UEDGE [4]. Experimental results of existing devices, however, cannot always be reproduced satisfactorily with these code packages and efforts have been made to resolve this issue from, for example, kinetic effects of a plasma [5], drifts [6,7], supersonic plasma flows [8], neutral models [5,6], impurity models [9] and plasmawall-interactions (PWI) models [7,8] points of view.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking of B2 Code with a One-Dimensional Plasma Fluid Model Incorporating Anisotropic Ion Pressures on Simple Mirror Configurations

Togo

Reiser

Börner

et al. 2018

Plasma and Fusion Research

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A plasma fluid code B2 has been benchmarked with a one-dimensional plasma fluid model incorporating the anisotropic ion pressures (AIP model) on simple mirror configurations. In a low collisionality case, profiles of plasma parameters of the B2 code deviate from those of the AIP model. The validity of the viscous-flux approximation is investigated by direct comparisons with the anisotropic part of the ion pressure indicating the invalidity of the viscous-flux approximation is considered to be responsible to deviations of profiles. In addition, supersonic plasma flows downstream from the mirror throat are observed.

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“…In this case, the ion saturation current exceeds the measurable range of the Langmuir probe for the divertor targets. Note that, although rollover and decrease of the incident ion flux to the divertor target have been observed [16][17][18], these phenomena are not reproduced using the SONIC code [19]. Hence, since the ion saturation current evaluated based on the plasma parameter obtained by SONIC code is overestimated, the ion saturation current under the detached divertor plasma condition would fall in the measurable range.…”

Section: Evaluation Of the Ion Saturation Currentmentioning

confidence: 97%

Development of Langmuir Probes on Divertor Cassettes in JT-60SA

Fukumoto

Sakurai

Asakura

et al. 2013

Plasma and Fusion Research

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Langmuir probes installed in the lower divertor region under high heat flux have been developed and manufactured for JT-60SA. A probe electrode with a head having a rooftop shape is made of a carbon fiber composite and can withstand heat fluxes of up to 10 MW/m 2 for 5 s and 1 MW/m 2 for 100 s. This has been achieved by increasing the volume of the probe electrode that is not directly exposed to the plasma. To minimize the reduction of the heat removal performance of the divertor, the Langmuir probes are installed in toroidal gaps with widths of 10 mm between the divertor cassettes, without embedding them in the divertor tiles. Aluminum oxide coatings have been applied to insulate the probe electrodes from the divertor cassettes and to limit the toroidal thickness to 8 mm. Brazing of the nickel connectors to the probe electrodes has reduced the toroidal thickness of the Langmuir probes. A minimum spatial resolution of 13.5 mm has been achieved to the Langmuir probes installed on the inner and outer divertor targets.

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Relativistic Plasma Physics. 7. Relativistic Particle Acceleration as Origin of Cosmic Ray.

Cited by 5 publications

References 36 publications

A simulation study of large power handling in the divertor for a Demo reactor

A simulation study of large power handling in the divertor for a Demo reactor

Benchmarking of B2 Code with a One-Dimensional Plasma Fluid Model Incorporating Anisotropic Ion Pressures on Simple Mirror Configurations

Development of Langmuir Probes on Divertor Cassettes in JT-60SA

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