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Linear microstability analysis of a low-Z impurity doped tokamak plasma
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Romanelli, M. (Michele), Szepesi, Gabor, Peeters, A. G., Apicella, M. L., Marinucci, M., Mazzotta, C., Mazzitelli, G. and Frigione, D. (2011) Linear microstability analysis of a low-Z impurity doped tokamak plasma. Nuclear Fusion, Vol.51 (No.10). Article: 103008. doi:10.1088/0029-5515/51/10/103008 ISSN 0029-5515.
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Official URL: http://dx.doi.org/10.1088/0029-5515/51/10/103008
Abstract
Improved electron and deuterium energy and particle confinement in the presence of low-Z impurities have been observed in many tokamaks under various experimental conditions. Peaked electron density profiles have been obtained in the Frascati Tokamak Upgrade (FTU) ohmic plasmas where a high concentration of lithium has been detected following the installation of a Liquid Lithium Limiter (LLL). This paper presents the results of a gyrokinetic study on the effects of lithium and other low-Z impurities on the linear stability of deuterium and electron temperature driven modes and their associated fluxes for plasma parameters such as those found in the core of LLL-FTU plasmas.
Simulations show that a lithium concentration in excess of n(Li)/n(e) = 15%, as estimated in the initial phase of a reference FTU discharge, is found to have a strong stabilizing effect on the TEM and high-frequency ETG modes. A significant stabilization of the electron driven modes can still be observed when the lithium concentration is reduced to 3%.
In the presence of a significant impurity concentration (n(Li)/n(e) = 3-15%) the long wavelength ITG modes drive an inward electron and deuterium flux and outward lithium flux. This process may lead eventually to an increased electron and deuterium density peaking and a reduced Z(eff) (lithium density below nLi/ne = 1%).
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Tokamaks, Plasma confinement, Plasma turbulence, Lithium | ||||
| Journal or Publication Title: | Nuclear Fusion | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0029-5515 | ||||
| Official Date: | October 2011 | ||||
| Dates: |
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| Volume: | Vol.51 | ||||
| Number: | No.10 | ||||
| Page Range: | Article: 103008 | ||||
| DOI: | 10.1088/0029-5515/51/10/103008 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Research Councils UK (RCUK), European Commission (EC), Engineering and Physical Sciences Research Council (EPSRC), Culham Centre for Fusion Energy (CCFE) | ||||
| Grant number: | EP/1501045 (RCUK), EP/H002081/1 (EPSRC) |
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