The Library
Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device
Tools
Fasoli, A., Burckel, A., Federspiel, L., Furno, I., Gustafson, K., Iraji, D., Labit, B., Loizu, J., Plyushchev, G., Ricci, P., Theiler, C., Diallo, A., Mueller, S. H., Podesta, M. and Poli, F. M. (Francesca) (2010) Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device. In: 37th European-Physical-Society-Conference-on-Plasma-Physics, Univ Campus, Helix Arts Ctr, Dublin, Ireland, June 22-25, 2010. Published in: Plasma Physics and Controlled Fusion, Vol.52 (No.12 Part 1). Article: 124020. doi:10.1088/0741-3335/52/12/124020 ISSN 0741-3335.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1088/0741-3335/52/12/124020
Abstract
Electrostatic turbulence, related structures and their effect on particle, heat and toroidal momentum transport are investigated in TORPEX simple magnetized plasmas using high-resolution diagnostics, control parameters, linear fluid models and nonlinear numerical simulations. The nature of the dominant instabilities is controlled by the value of the vertical magnetic field, B-v, relative to that of the toroidal field, B-T. For B-v/B-T > 3%, only ideal interchange instabilities are observed. A critical pressure gradient to drive the interchange instability is experimentally identified. Interchange modes give rise to blobs, radially propagating filaments of enhanced plasma pressure. Blob velocities and sizes are obtained from electrostatic probe measurements using pattern recognition methods. The observed values span a wide range and are described by a single analytical expression, from the small blob size regime in which the blob velocity is limited by cross-field ion polarization currents, to the large blob size regime in which the limitation to the blob velocity comes from parallel currents to the sheath. As a first attempt at controlling the blob dynamical properties, limiter configurations with varying angles between field lines and the conducting surface of the limiter are explored. Mach probe measurements clearly demonstrate a link between toroidal flows and blobs. To complement probe data, a fast framing camera and amovable gas puffing system are installed. Density and light fluctuations show similar signatures of interchange activity. Further developments of optical diagnostics, including an image intensifier and laser-induced fluorescence, are under way. The effect of interchange turbulence on fast ion phase space dynamics is studied using movable fast ion source and detector in scenarios for which the development from linear waves into blobs is fully characterized. A theory validation project is conducted in parallel with TORPEX experiments, based on quantitative comparisons of observables that are defined in the same way in the data and in the output of numerical codes, including 2D and 3D local and global simulations.
Item Type: | Conference Item (UNSPECIFIED) | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0741-3335 | ||||
Official Date: | December 2010 | ||||
Dates: |
|
||||
Volume: | Vol.52 | ||||
Number: | No.12 Part 1 | ||||
Number of Pages: | 22 | ||||
Page Range: | Article: 124020 | ||||
DOI: | 10.1088/0741-3335/52/12/124020 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Title of Event: | 37th European-Physical-Society-Conference-on-Plasma-Physics | ||||
Type of Event: | Conference | ||||
Location of Event: | Univ Campus, Helix Arts Ctr, Dublin, Ireland | ||||
Date(s) of Event: | June 22-25, 2010 |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |