Modeling of impurity effect on drift instabilities in plasmas with many ion species

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3283390· OSTI ID:21344640

Moradi, S ^[1]; Tokar, M Z ^[2]; Weyssow, B ^[3]

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1. Department of Statistical and Plasma Physics, Universite Libre de Bruxelles, 1050 Brussels (Belgium)
2. Institute fuer Energieforschung-Plasmaphysik, Forschungszentrum Juelich, Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425 Juelich (Germany)
3. EFDA-CSU, D-85748 Garching, Muenchen (Germany)

Drift microinstabilities, being the main cause of anomalous transport of charged particles and energy in fusion plasmas, can be strongly influenced by the presence of impurities. Normally a large amount of different ion species from diverse charge states and chemical elements is present. An approach, providing a possibility to take into account an arbitrary number of ion species in analysis of instabilities, is proposed and applied to study the impurity effect on unstable modes due to ion temperature gradient and trapped electrons described in a linear fluid approximation. The method is validated by comparing with the results from direct calculations in a one impurity ion case. The dependence of instability characteristics and anomalous transport coefficients on the absolute level and radial gradient of impurity density is investigated. Plasmas with several impurity ion species, including C{sup +6}, N{sup +7}, O{sup +8}, Ne{sup +10}, and Ar{sup +18} whose density peaking factors are determined self-consistently from the impurity zero flux condition, are considered as an example of applications.

• OSTI ID: 21344640
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 17; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ARGON IONS
CARBON IONS
CHARGE STATES
CHARGED PARTICLES
DRIFT INSTABILITY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
IMPURITIES
INSTABILITY
ION TEMPERATURE
IONS
LEPTONS
NEON IONS
NITROGEN IONS
OXYGEN IONS
PLASMA
PLASMA IMPURITIES
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
SIMULATION
TEMPERATURE GRADIENTS
TRAPPED ELECTRONS