Abstract
The purpose of this work is to take into account and study the effect of the electric field profiles on the Lower Hybrid (LH) current drive efficiency during transient phases such as rampup. As a complement to the full ray-tracing / Fokker Planck studies, and for the purpose of optimization studies, we developed a simplified 1-D model based on the adjoint Karney-Fisch numerical results. This approach allows us to estimate the LH power deposition profile which would be required for ramping the current with prescribed rate, total current density profile (q-profile) and surface loop voltage. For rampup optimization studies, we can therefore scan the whole parameter space and eliminate a posteriori those scenarios which correspond to unrealistic deposition profiles. We thus obtain the time evolution of the LH power, minor radius of the plasma, volt-second consumption and total energy dissipated. Optimization can thus be performed with respect to any of those criteria. This scheme is illustrated by some numerical simulations performed with TORE-SUPRA and NET/ITER parameters. We conclude with a derivation of a simple and general scaling law for the flux consumption during the rampup phase.
Litaudon, X;
Moreau, D;
Bizarro, J P;
Hoang, G T;
Kupfer, K;
Peysson, Y;
[1]
Fuchs, V;
[2]
Shkarofsky, I P;
[3]
Bonoli, P
[4]
- Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 -Saint- Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
- Centre Canadien de Fusion Magnetique, Varennes, PW (Canada)
- MPB Technologies, Inc., Ste. Anne de Bellevue, PQ (Canada)
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
Citation Formats
Litaudon, X, Moreau, D, Bizarro, J P, Hoang, G T, Kupfer, K, Peysson, Y, Fuchs, V, Shkarofsky, I P, and Bonoli, P.
Adjoint optimization scheme for lower hybrid current rampup and profile control in Tokamak.
France: N. p.,
1992.
Web.
Litaudon, X, Moreau, D, Bizarro, J P, Hoang, G T, Kupfer, K, Peysson, Y, Fuchs, V, Shkarofsky, I P, & Bonoli, P.
Adjoint optimization scheme for lower hybrid current rampup and profile control in Tokamak.
France.
Litaudon, X, Moreau, D, Bizarro, J P, Hoang, G T, Kupfer, K, Peysson, Y, Fuchs, V, Shkarofsky, I P, and Bonoli, P.
1992.
"Adjoint optimization scheme for lower hybrid current rampup and profile control in Tokamak."
France.
@misc{etde_10123456,
title = {Adjoint optimization scheme for lower hybrid current rampup and profile control in Tokamak}
author = {Litaudon, X, Moreau, D, Bizarro, J P, Hoang, G T, Kupfer, K, Peysson, Y, Fuchs, V, Shkarofsky, I P, and Bonoli, P}
abstractNote = {The purpose of this work is to take into account and study the effect of the electric field profiles on the Lower Hybrid (LH) current drive efficiency during transient phases such as rampup. As a complement to the full ray-tracing / Fokker Planck studies, and for the purpose of optimization studies, we developed a simplified 1-D model based on the adjoint Karney-Fisch numerical results. This approach allows us to estimate the LH power deposition profile which would be required for ramping the current with prescribed rate, total current density profile (q-profile) and surface loop voltage. For rampup optimization studies, we can therefore scan the whole parameter space and eliminate a posteriori those scenarios which correspond to unrealistic deposition profiles. We thus obtain the time evolution of the LH power, minor radius of the plasma, volt-second consumption and total energy dissipated. Optimization can thus be performed with respect to any of those criteria. This scheme is illustrated by some numerical simulations performed with TORE-SUPRA and NET/ITER parameters. We conclude with a derivation of a simple and general scaling law for the flux consumption during the rampup phase.}
place = {France}
year = {1992}
month = {Dec}
}
title = {Adjoint optimization scheme for lower hybrid current rampup and profile control in Tokamak}
author = {Litaudon, X, Moreau, D, Bizarro, J P, Hoang, G T, Kupfer, K, Peysson, Y, Fuchs, V, Shkarofsky, I P, and Bonoli, P}
abstractNote = {The purpose of this work is to take into account and study the effect of the electric field profiles on the Lower Hybrid (LH) current drive efficiency during transient phases such as rampup. As a complement to the full ray-tracing / Fokker Planck studies, and for the purpose of optimization studies, we developed a simplified 1-D model based on the adjoint Karney-Fisch numerical results. This approach allows us to estimate the LH power deposition profile which would be required for ramping the current with prescribed rate, total current density profile (q-profile) and surface loop voltage. For rampup optimization studies, we can therefore scan the whole parameter space and eliminate a posteriori those scenarios which correspond to unrealistic deposition profiles. We thus obtain the time evolution of the LH power, minor radius of the plasma, volt-second consumption and total energy dissipated. Optimization can thus be performed with respect to any of those criteria. This scheme is illustrated by some numerical simulations performed with TORE-SUPRA and NET/ITER parameters. We conclude with a derivation of a simple and general scaling law for the flux consumption during the rampup phase.}
place = {France}
year = {1992}
month = {Dec}
}