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A continuum self organized critically model of turbulent heat transport in tokamaks

Abstract

Based on the now well known and experimentally observed critical gradient length (R/L{sub Te} = RT/{nabla}T) in tokamaks, we present a continuum one dimensional model for explaining self organized heat transport in tokamaks. Key parameters of this model include a novel hysteresis parameter which ensures that the switch of heat transport coefficient {chi} upwards and downwards takes place at two different values of R/L{sub Te}. Extensive numerical simulations of this model reproduce many features of present day tokamaks such as submarginal temperature profiles, intermittent transport events, 1/f scaling of the frequency spectra, propagating fronts, etc. This model utilises a minimal set of phenomenological parameters, which may be determined from experiments and/or simulations. Analytical and physical understanding of the observed features has also been attempted. (author)
Authors:
Tangri, V; Das, A; Kaw, P; Singh, R [1] 
  1. Institute for Plasma Research, Gandhinagar (India)
Publication Date:
Sep 01, 2003
Product Type:
Conference
Report Number:
IAEA-CSP-19/CD; IAEA-CN-94
Resource Relation:
Conference: 19. IAEA fusion energy conference, Lyon (France), 14-19 Oct 2002; Other Information: 18 refs, 5 figs; Data in PDF format; PBD: Sep 2003; Related Information: In: Fusion energy 2002. 19th conference proceedings, C and S papers series no. 19/CD, 516 pages.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; ELECTRON TEMPERATURE; HEAT TRANSFER; HYSTERESIS; PLASMA SIMULATION; SCALING LAWS; TEMPERATURE GRADIENTS; TOKAMAK DEVICES
OSTI ID:
20504799
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); Commissariat a l'Energie Atomique (France)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 1562-4153; ISSN 1562-4153; TRN: XA0303809073985
Availability:
Available from INIS in electronic form; Also available on-line: http://www-pub.iaea.org/MTCD/publications/PDF/csp_019c/START.HTM; http://www.iaea.org/programmes/ripc/physics/fec2002/html/fec2002.htm; and on 1 CD-ROM from IAEA, Sales and Promotion Unit: E-mail: sales.publications@iaea.org; Web site: http://www-pub.iaea.org/MTCD/publications/publications.asp
Submitting Site:
INIS
Size:
8 pages
Announcement Date:
Sep 29, 2004

Citation Formats

Tangri, V, Das, A, Kaw, P, and Singh, R. A continuum self organized critically model of turbulent heat transport in tokamaks. IAEA: N. p., 2003. Web.
Tangri, V, Das, A, Kaw, P, & Singh, R. A continuum self organized critically model of turbulent heat transport in tokamaks. IAEA.
Tangri, V, Das, A, Kaw, P, and Singh, R. 2003. "A continuum self organized critically model of turbulent heat transport in tokamaks." IAEA.
@misc{etde_20504799,
title = {A continuum self organized critically model of turbulent heat transport in tokamaks}
author = {Tangri, V, Das, A, Kaw, P, and Singh, R}
abstractNote = {Based on the now well known and experimentally observed critical gradient length (R/L{sub Te} = RT/{nabla}T) in tokamaks, we present a continuum one dimensional model for explaining self organized heat transport in tokamaks. Key parameters of this model include a novel hysteresis parameter which ensures that the switch of heat transport coefficient {chi} upwards and downwards takes place at two different values of R/L{sub Te}. Extensive numerical simulations of this model reproduce many features of present day tokamaks such as submarginal temperature profiles, intermittent transport events, 1/f scaling of the frequency spectra, propagating fronts, etc. This model utilises a minimal set of phenomenological parameters, which may be determined from experiments and/or simulations. Analytical and physical understanding of the observed features has also been attempted. (author)}
place = {IAEA}
year = {2003}
month = {Sep}
}