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Profile constraining mechanism for T{sub e} profile invariance in tokamaks

Technical Report:

Abstract

A new model for the electron temperature profile resilience in the outer half of tokamak plasmas is proposed and investigated. It is shown that introducing a negative feedback term into the scaling of the electron heat diffusivity {chi}{sub e}(r) = {chi}{sub ee}(r)(1-{alpha}a{sup 2}/T{sub eo} d{sup 2}T{sub e}/dr{sup 2}) with {alpha} > or {approx} 3 results in the observed T{sub e} profile stiffness against variations of the density and heating profiles. In addition, the feedback by itself yields the measured approximately linear T{sub e}(r) shape for r/a > or {approx} 0.5 in contrast to previous profile constraining models. (orig.). 6 figs.
Authors:
Publication Date:
Mar 01, 1993
Product Type:
Technical Report
Report Number:
IPP-5/51
Reference Number:
SCA: 700410; PA: DEN-94:0F0658; EDB-94:027907; ERA-19:007878; NTS-94:015644; SN: 94001136105
Resource Relation:
Other Information: PBD: Mar 1993
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; ELECTRON TEMPERATURE; THERMAL DIFFUSIVITY; ELECTRONS; ELECTRON DENSITY; SCALING LAWS; SPATIAL DISTRIBUTION; JOULE HEATING; 700410; SPECIFIC FUSION DEVICES AND EXPERIMENTS
OSTI ID:
10119781
Research Organizations:
Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE94733999; TRN: DE94F0658
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
14 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Becker, G. Profile constraining mechanism for T{sub e} profile invariance in tokamaks. Germany: N. p., 1993. Web.
Becker, G. Profile constraining mechanism for T{sub e} profile invariance in tokamaks. Germany.
Becker, G. 1993. "Profile constraining mechanism for T{sub e} profile invariance in tokamaks." Germany.
@misc{etde_10119781,
title = {Profile constraining mechanism for T{sub e} profile invariance in tokamaks}
author = {Becker, G}
abstractNote = {A new model for the electron temperature profile resilience in the outer half of tokamak plasmas is proposed and investigated. It is shown that introducing a negative feedback term into the scaling of the electron heat diffusivity {chi}{sub e}(r) = {chi}{sub ee}(r)(1-{alpha}a{sup 2}/T{sub eo} d{sup 2}T{sub e}/dr{sup 2}) with {alpha} > or {approx} 3 results in the observed T{sub e} profile stiffness against variations of the density and heating profiles. In addition, the feedback by itself yields the measured approximately linear T{sub e}(r) shape for r/a > or {approx} 0.5 in contrast to previous profile constraining models. (orig.). 6 figs.}
place = {Germany}
year = {1993}
month = {Mar}
}