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Title: Comments on the kinetic dynamo

Abstract

It is conjectured that transport by parallel mass flow in a braided magnetic field, rather than hyper-resistivity, drives the dynamo effect after stochasticity is established. In this paper the authors do not attempt a rigorous proof of this conjecture, which requires showing that braiding introduces correlations analogous to those giving rise to the neoclassical bootstrap current. The authors do offer plausible arguments for the conjecture and show that it leads to interesting consequences if true. Namely, magnetic fluctuations would then scale with the magnetic Reynolds number S like {tilde B}/B {approximately} S{sup {minus}1/2} and the Rechester-Rosenbluth thermal diffusivity like {chi}e {proportional_to} S{sup {minus}1} . This scaling would explain the highest temperatures obtained in the CTX spheromak. It also suggests that a fully-bootstrapped current drive experiment could be carried out on-the DIII-D tokamak.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
114000
Report Number(s):
UCRL-ID-121728
ON: DE96001025; TRN: 95:023237
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 24 Aug 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; CTX SPHEROMAK; NEOCLASSICAL TRANSPORT THEORY; DOUBLET-3 DEVICE; STOCHASTIC PROCESSES; MASS TRANSFER; BOOTSTRAP CURRENT

Citation Formats

Fowler, T K. Comments on the kinetic dynamo. United States: N. p., 1995. Web. doi:10.2172/114000.
Fowler, T K. Comments on the kinetic dynamo. United States. https://doi.org/10.2172/114000
Fowler, T K. 1995. "Comments on the kinetic dynamo". United States. https://doi.org/10.2172/114000. https://www.osti.gov/servlets/purl/114000.
@article{osti_114000,
title = {Comments on the kinetic dynamo},
author = {Fowler, T K},
abstractNote = {It is conjectured that transport by parallel mass flow in a braided magnetic field, rather than hyper-resistivity, drives the dynamo effect after stochasticity is established. In this paper the authors do not attempt a rigorous proof of this conjecture, which requires showing that braiding introduces correlations analogous to those giving rise to the neoclassical bootstrap current. The authors do offer plausible arguments for the conjecture and show that it leads to interesting consequences if true. Namely, magnetic fluctuations would then scale with the magnetic Reynolds number S like {tilde B}/B {approximately} S{sup {minus}1/2} and the Rechester-Rosenbluth thermal diffusivity like {chi}e {proportional_to} S{sup {minus}1} . This scaling would explain the highest temperatures obtained in the CTX spheromak. It also suggests that a fully-bootstrapped current drive experiment could be carried out on-the DIII-D tokamak.},
doi = {10.2172/114000},
url = {https://www.osti.gov/biblio/114000}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Aug 24 00:00:00 EDT 1995},
month = {Thu Aug 24 00:00:00 EDT 1995}
}