Abstract
To know what happens to particles issued from the plasma is fundamental. The layer of plasma beyond the last closed flux surface, the SOL (Scrape off Layer), is characterized by its radial thickness, {lambda}. We established the first abaci which show the dependence of this characteristic length on different parameters of the plasma, such as density, current and magnetic field, on Tore Supra. We matched up numerical results of a code with experimental measures of surface temperatures made by infrared thermography. The main conclusion is that, on Tore Supra, {lambda} is almost independent of plasma conditions. In fact, it varies between 1 and 2 10{sup -2} m. But, the error made assuming it constant is lower than the uncertainties we have concerning material elements. This study is local. On the contrary, the code THOR we developed, takes the real geometry of all the limiters and of the magnetic equilibrium into account. It gives the image of the plasma on the walls. It combines parallel motion with perpendicular diffusion of which random character is obtained by an algorithm of Monte Carlo. Motion equations are in intrinsic coordinates whereas results are in ordinary coordinates. The code allows to disturb the initial magnetic
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Citation Formats
Seigneur, A.
Modeling of power deposition in a tokamak. Application to limiters configurations and the Ergodic Divertor on Tore Supra; Modelisation du depot de puissance dans un tokamak. Application aux configurations limiteurs et divertor ergodique dans Tore Supra.
France: N. p.,
1993.
Web.
Seigneur, A.
Modeling of power deposition in a tokamak. Application to limiters configurations and the Ergodic Divertor on Tore Supra; Modelisation du depot de puissance dans un tokamak. Application aux configurations limiteurs et divertor ergodique dans Tore Supra.
France.
Seigneur, A.
1993.
"Modeling of power deposition in a tokamak. Application to limiters configurations and the Ergodic Divertor on Tore Supra; Modelisation du depot de puissance dans un tokamak. Application aux configurations limiteurs et divertor ergodique dans Tore Supra."
France.
@misc{etde_10123467,
title = {Modeling of power deposition in a tokamak. Application to limiters configurations and the Ergodic Divertor on Tore Supra; Modelisation du depot de puissance dans un tokamak. Application aux configurations limiteurs et divertor ergodique dans Tore Supra}
author = {Seigneur, A}
abstractNote = {To know what happens to particles issued from the plasma is fundamental. The layer of plasma beyond the last closed flux surface, the SOL (Scrape off Layer), is characterized by its radial thickness, {lambda}. We established the first abaci which show the dependence of this characteristic length on different parameters of the plasma, such as density, current and magnetic field, on Tore Supra. We matched up numerical results of a code with experimental measures of surface temperatures made by infrared thermography. The main conclusion is that, on Tore Supra, {lambda} is almost independent of plasma conditions. In fact, it varies between 1 and 2 10{sup -2} m. But, the error made assuming it constant is lower than the uncertainties we have concerning material elements. This study is local. On the contrary, the code THOR we developed, takes the real geometry of all the limiters and of the magnetic equilibrium into account. It gives the image of the plasma on the walls. It combines parallel motion with perpendicular diffusion of which random character is obtained by an algorithm of Monte Carlo. Motion equations are in intrinsic coordinates whereas results are in ordinary coordinates. The code allows to disturb the initial magnetic equilibrium. So, we improved its capacities by adding perturbations induced by an ergodic divertor. Numerical results really match experimental observations. Sometimes, they question some physical models. So, we made our analytical model which explains the features of real energy deposits, numerically found, on the first wall, which do not match predictions of the classical model. The code can also be a tool to design and to test some new limiters, which should be used on Tore Supra, before their construction. (author). 31 refs., 79 figs., tabs.}
place = {France}
year = {1993}
month = {May}
}
title = {Modeling of power deposition in a tokamak. Application to limiters configurations and the Ergodic Divertor on Tore Supra; Modelisation du depot de puissance dans un tokamak. Application aux configurations limiteurs et divertor ergodique dans Tore Supra}
author = {Seigneur, A}
abstractNote = {To know what happens to particles issued from the plasma is fundamental. The layer of plasma beyond the last closed flux surface, the SOL (Scrape off Layer), is characterized by its radial thickness, {lambda}. We established the first abaci which show the dependence of this characteristic length on different parameters of the plasma, such as density, current and magnetic field, on Tore Supra. We matched up numerical results of a code with experimental measures of surface temperatures made by infrared thermography. The main conclusion is that, on Tore Supra, {lambda} is almost independent of plasma conditions. In fact, it varies between 1 and 2 10{sup -2} m. But, the error made assuming it constant is lower than the uncertainties we have concerning material elements. This study is local. On the contrary, the code THOR we developed, takes the real geometry of all the limiters and of the magnetic equilibrium into account. It gives the image of the plasma on the walls. It combines parallel motion with perpendicular diffusion of which random character is obtained by an algorithm of Monte Carlo. Motion equations are in intrinsic coordinates whereas results are in ordinary coordinates. The code allows to disturb the initial magnetic equilibrium. So, we improved its capacities by adding perturbations induced by an ergodic divertor. Numerical results really match experimental observations. Sometimes, they question some physical models. So, we made our analytical model which explains the features of real energy deposits, numerically found, on the first wall, which do not match predictions of the classical model. The code can also be a tool to design and to test some new limiters, which should be used on Tore Supra, before their construction. (author). 31 refs., 79 figs., tabs.}
place = {France}
year = {1993}
month = {May}
}