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Descripción
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| Accurate theoretical models for current collection are necessary to use Langmuir probes as a plasma diagnostic instrument. In flowing plasmas, non-stationary numerical algorithms are needed because particle trapping is important to recover quasineutrality in the presheath [1]. The most popular is the particle-in-cell (PIC) code, which is very robust and allows for an easy parallelization. However, it introduces numerical noise and, since the probe acts as a sink, the conservation of macroparticles throughout the simulation is difficult. Recently, a direct Vlasov code, which solves the Vlasov equation by discretizing the distribution function in phase space instead of using macroparticles has been developed [2]. This code is based on finite-difference formula to approximate spatial and velocity derivatives and a Runge-Kutta method to carry out the time integration. Here we present an extension of this code that takes into account the plasma drift effect and the azimuthal dependences of the potential and the distribution functions. A parallelization strategy in both radial and azimuthal coordinates has been implemented. Numerical results in steady and flowing plasmas are presented and compared with previous theories. | |
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Internacional
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Si |
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Nombre congreso
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10th International Workshop on Electric Probes in Magnetized Plasmas (IWEP 2013) |
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Tipo de participación
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960 |
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Lugar del congreso
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Madrid, España |
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Revisores
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Si |
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ISBN o ISSN
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978-84-86402-099 |
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DOI
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Fecha inicio congreso
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09/07/2013 |
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Fecha fin congreso
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12/07/2013 |
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Desde la página
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38 |
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Hasta la página
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38 |
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Título de las actas
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Book of Abstracs of the 10-th International Workshop on Electric Probes in Magnetized Plasmas IWEP 2013, Editorial Universidad Politécnica de Madrid |