Abstract
Electron thermal diffusivity studies can be carried out in two ways: static and dynamic. In the static analysis, the transport coefficients are determined from the stationary power balance, in the dynamic analysis from the propagation of a small perturbation of the stationary plasma state which can be caused by either a sawtooth generated heat pulse or modulation of the heating power. Electron thermal diffusivity [chi][sub e] is deduced from the evolution of the perturbed electron temperature T[sub e] at different locations r[sub i] in the plasma. [chi][sub e] values obtained from perturbation analysis are usually greater than those calculated from power balance. It has been pointed out that there is a principal difference between static and perturbative analysis. Whereas the static method yields the transport coefficient [chi][sub e]=q[sub e]/n[sub e][nabla]T[sub e], the perturbative method leads to an increase of the flux q[sub e] as a result of an increase in the temperature gradient [nabla]T[sub e]. The quantity determined is an incremental [chi][sub e] as defined by [chi][sub e][sup inc]=[partial derivative]q[sub e]/n[sub e][partial derivative]([nabla]T[sub e]). By varying the modulation of the heating power at different frequencies and amplitudes one can address the question whether or not this discrepancy is a function
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Hartfuss, H J;
Erckmann, V;
Giannone, L.;
Maassberg, H;
Tutter, M
[1]
- Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
Citation Formats
Hartfuss, H J, Erckmann, V, Giannone, L., Maassberg, H, and Tutter, M.
Thermal diffusivity from heat wave propagation in Wendelstein 7-AS.
Switzerland: N. p.,
1991.
Web.
Hartfuss, H J, Erckmann, V, Giannone, L., Maassberg, H, & Tutter, M.
Thermal diffusivity from heat wave propagation in Wendelstein 7-AS.
Switzerland.
Hartfuss, H J, Erckmann, V, Giannone, L., Maassberg, H, and Tutter, M.
1991.
"Thermal diffusivity from heat wave propagation in Wendelstein 7-AS."
Switzerland.
@misc{etde_6457335,
title = {Thermal diffusivity from heat wave propagation in Wendelstein 7-AS}
author = {Hartfuss, H J, Erckmann, V, Giannone, L., Maassberg, H, and Tutter, M}
abstractNote = {Electron thermal diffusivity studies can be carried out in two ways: static and dynamic. In the static analysis, the transport coefficients are determined from the stationary power balance, in the dynamic analysis from the propagation of a small perturbation of the stationary plasma state which can be caused by either a sawtooth generated heat pulse or modulation of the heating power. Electron thermal diffusivity [chi][sub e] is deduced from the evolution of the perturbed electron temperature T[sub e] at different locations r[sub i] in the plasma. [chi][sub e] values obtained from perturbation analysis are usually greater than those calculated from power balance. It has been pointed out that there is a principal difference between static and perturbative analysis. Whereas the static method yields the transport coefficient [chi][sub e]=q[sub e]/n[sub e][nabla]T[sub e], the perturbative method leads to an increase of the flux q[sub e] as a result of an increase in the temperature gradient [nabla]T[sub e]. The quantity determined is an incremental [chi][sub e] as defined by [chi][sub e][sup inc]=[partial derivative]q[sub e]/n[sub e][partial derivative]([nabla]T[sub e]). By varying the modulation of the heating power at different frequencies and amplitudes one can address the question whether or not this discrepancy is a function of the varied parameters. (author) 7 refs., 2 figs.}
journal = []
volume = {15C:Part II}
place = {Switzerland}
year = {1991}
month = {Jan}
}
title = {Thermal diffusivity from heat wave propagation in Wendelstein 7-AS}
author = {Hartfuss, H J, Erckmann, V, Giannone, L., Maassberg, H, and Tutter, M}
abstractNote = {Electron thermal diffusivity studies can be carried out in two ways: static and dynamic. In the static analysis, the transport coefficients are determined from the stationary power balance, in the dynamic analysis from the propagation of a small perturbation of the stationary plasma state which can be caused by either a sawtooth generated heat pulse or modulation of the heating power. Electron thermal diffusivity [chi][sub e] is deduced from the evolution of the perturbed electron temperature T[sub e] at different locations r[sub i] in the plasma. [chi][sub e] values obtained from perturbation analysis are usually greater than those calculated from power balance. It has been pointed out that there is a principal difference between static and perturbative analysis. Whereas the static method yields the transport coefficient [chi][sub e]=q[sub e]/n[sub e][nabla]T[sub e], the perturbative method leads to an increase of the flux q[sub e] as a result of an increase in the temperature gradient [nabla]T[sub e]. The quantity determined is an incremental [chi][sub e] as defined by [chi][sub e][sup inc]=[partial derivative]q[sub e]/n[sub e][partial derivative]([nabla]T[sub e]). By varying the modulation of the heating power at different frequencies and amplitudes one can address the question whether or not this discrepancy is a function of the varied parameters. (author) 7 refs., 2 figs.}
journal = []
volume = {15C:Part II}
place = {Switzerland}
year = {1991}
month = {Jan}
}