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Author(s):
K. Shimizu, T. Takizuka, H. Kawashima
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Title:
Extension of IMPMC Code toward Time Evolution Simulation
Date of publication:
Aug. 2007
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Key words:
Monte Carlo Modelling, Impurity transport, Divertor modelling, JT-60U
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Abstract:
A self-consistent modelling of divertor plasma and impurity transport has
been developed. The key feature of this integrated code, SONIC, is to
incorporate the elaborate impurity Monte Carlo code, IMPMC. Monte-Carlo (MC)
approach is suitable for modelling of interactions between impurities and
walls, including kinetic effects, and the complicated dissociation process
of hydrocarbons. The MC modelling, however, has the disadvantage for long
computational time, large MC noise, and assumption of steady state. The
first and second difficulties were solved by developing a new diffusion
model and optimizing with a Message Passing Interface (MPI) on the massive
parallel computer. The third subject is solved by extension of IMPMC code
toward time evolution simulation. A time-dependent simulation with impurity
MC code involves a problem to increase number of test particles. The
particle reduction method to resolve this problem is newly developed and
validated.
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