Examples of Construction of PC Clusters

淳, 福山; 雅敏, 矢木; 裕志, 内藤

doi:10.1585/jspf.79.780

Cited by 2 publications

(1 citation statement)

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“…In the one-dimensional simulation, we used the VSIM1D code [9][10][11][12], which runs on a PC-UNIX operating system and monitors the real time behaviour of the phase space plots of charged particles, the potential profile, and other quantities on a display. In order to perform the two-dimensional simulation, which requires much more computer resources than the one-dimensional one, we were forced to construct a new PC-cluster system [13].…”

Section: Simulation Modelmentioning

confidence: 99%

Simulation of photo-detached electrons in negative ion plasmas

Naitou

Sakurai

Tauchi

et al. 2004

Plasma Phys. Control. Fusion

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The evolution of laser photo-detached and background electrons in a glow discharge plasma containing negative ions was followed using a two-dimensional particle-in-cell simulation code. Emphasis was placed on the short timescale (20 ns after photo-detachment for the parameters of a typical glow discharge plasma) behaviour because this is the timescale of the recently developed laser Thomson scattering technique combined with photo-detachment. A plasma consisting of background electrons, positive argon ions (Ar + ) and negative oxygen ions (O − ) was treated. The loss of photo-detached electrons from the photo-detachment region quickly forms a potential structure in a short time of 2 ns. The potential traps the remaining photo-detached electrons. The profile of the trapped photo-detached electrons is hollow. The loss of the photodetached electrons from the photo-detachment region is compensated by the bulk electrons coming from the ambient plasma; the sum of the photo-detached and bulk electron densities in the photo-detachment region remains unchanged for 20 ns because ions are almost immobile in this timescale. This analysis has also revealed the fractions of the photo-detached electrons remaining in the photo-detachment region during the 20 ns to be relatively insensitive to a change in laser beam size and very sensitive to the relative densities of negative ions against background electrons, and to the shape of the velocity distribution function at different angles with respect to the laser beam axis.

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Section: Simulation Modelmentioning

confidence: 99%

Simulation of photo-detached electrons in negative ion plasmas

Naitou

Sakurai

Tauchi

et al. 2004

Plasma Phys. Control. Fusion

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Current Profile Control for High Bootstrap Current Operation in ITER

Mano

Yamazaki

Oishi

et al. 2012

Plasma and Fusion Research

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For the achievement of steady-state fusion power plant, non-inductively current-driven plasma operation should be maintained in tokamak fusion reactors. Total non-inductive current is a summation of bootstrap current proportional to the plasma pressure gradient and externally driven non-inductive current such as neutral beam driven current. Especially in order to establish a commercial reactor, it is necessary to reduce the amount of external current-drive power and to maintain the majority of the plasma current with bootstrap current. Burning plasma has high autonomy, so the change in current density profile including changes in particle and heat transports should be checked. In this study time-evolution analysis of the current density profile for burning plasmas in the ITER machine has been conducted by using 2.0-dimensional equilibrium, 1.5-dimensional-transport code (TOTAL code). Here current-diffusive ballooning mode model was adopted as a heat transport model. It is concluded that external current-drive is required both in the center and near the periphery of the plasma in order to maintain steady-state profiles of temperature and density with high bootstrap current fraction.

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Examples of Construction of PC Clusters

Cited by 2 publications

References 0 publications

Simulation of photo-detached electrons in negative ion plasmas

Simulation of photo-detached electrons in negative ion plasmas

Current Profile Control for High Bootstrap Current Operation in ITER

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