Simulation of small size divertor tokamak plasma edge under effect of toroidal magnetic field reversal
Author(s)
A. H. Bekheit
ABSTRACT
Asymmetries between the divertor legs of small size divertor (SSD) tokamak plasma edge are noticed to reverse when the direction of toroidal magnetic field is reversed. In the present paper the small size divertor tokamak plasma edge under effect of toroidal magnetic field reversal is simulated by B2SOLPS0.5.2D fluid transport code. The simulation demonstrate the following results: 1) Parallel (toroidal) flow flux and Mach number up to 0.6 at higher plasma density reverse with reverse toroidal magnetic direction in the edge plasma of small size divertor tokamak. 2) The radial electric field is toroidal magnetic direction independence in edge plasma of small size divertor tokamak. 3) For normal and reverse toroidal magnetic field, the strong ITB is located between the positions of the maximum and minimum values of the radial electric field shear. 4) Simulation result shows that, the structure of radial electric field at high field side (HFS) and low field side (LFS) is different. This difference result from the change in the parallel flux flows in the scrape off layer (SOL) to plasma core through separatrix. 5) At a region of strong radial electric field shear, a large reduction of poloidal rotation was observed. 6) The poloidal rotation is toroidal magnetic field direction dependence.
Asymmetries between the divertor legs of small size divertor (SSD) tokamak plasma edge are noticed to reverse when the direction of toroidal magnetic field is reversed. In the present paper the small size divertor tokamak plasma edge under effect of toroidal magnetic field reversal is simulated by B2SOLPS0.5.2D fluid transport code. The simulation demonstrate the following results: 1) Parallel (toroidal) flow flux and Mach number up to 0.6 at higher plasma density reverse with reverse toroidal magnetic direction in the edge plasma of small size divertor tokamak. 2) The radial electric field is toroidal magnetic direction independence in edge plasma of small size divertor tokamak. 3) For normal and reverse toroidal magnetic field, the strong ITB is located between the positions of the maximum and minimum values of the radial electric field shear. 4) Simulation result shows that, the structure of radial electric field at high field side (HFS) and low field side (LFS) is different. This difference result from the change in the parallel flux flows in the scrape off layer (SOL) to plasma core through separatrix. 5) At a region of strong radial electric field shear, a large reduction of poloidal rotation was observed. 6) The poloidal rotation is toroidal magnetic field direction dependence.
Cite this paper
Bekheit, A. (2011) Simulation of small size divertor tokamak plasma edge under effect of toroidal magnetic field reversal. Natural Science, 3, 738-742. doi: 10.4236/ns.2011.38098.
Bekheit, A. (2011) Simulation of small size divertor tokamak plasma edge under effect of toroidal magnetic field reversal. Natural Science, 3, 738-742. doi: 10.4236/ns.2011.38098.
References
[1] Bekheit, A.H. (2008) Simulation of small size divertor tokamak plasma edge including self consistent electric field, Jouenal of Fusion Energy, 27, 338-345. doi.10.1007/s10894-008-9148-z [2] LaBombard, H., Hutchinson, B., Lipshultz, McCracken, G., Snipes J. and Terry J., (1995) The effects of field reversal on the Alcator C-Mod divertor, Journal of Plasma Physics Control Fusion, 37, 1389-1406. doi.10.1088/0741-3335/37/12/004 [3] Chankin, A.V. Stangeby, P.C., K, Erents, P. and Harbour, J., Lingertat, (1994) The effect of BT reversal on the asymmetries between the strike zones in single null divertor discharges: experiment and theories, Journal of Plasma Physics Control Fusion, 37, 1853-1864. doi.10.1088/0741-3335/36/11/011 [4] Schneider, R, Rozhansky, V. and Voskoboynikov, V. (2001) Simulation of tokamak edge plasma including self-consistent electric field, Journal of Nuclear Fusion, 41, 387. doi.10.1088/0029-5515/41/4/305 [5] Murphy, S.A. (2011) Glow Discharges and Tokamaks: Principles and Application of Small Size Divertor Tokamak, Nova Science Publisher, Hauppauge. [6] Rognlien, T.D., Ryutov, D. and Mattor, N. (1999) Influence of E x B and ?B drift terms in 2-D edge /SOL transport simulation, Journal of Nuclear Materials, 266- 269, 654-659. doi.10.1016/S0022-3115(98)00835-6 [7] Wolfe, S., LaBombard, H., Hutchinson, B., Lipshultz, G., McCracken, J., Snipes and Terry, J. (1997) Experimental investigation of transport phenomena in the Scrape Off layer and divertor, Journal of Nuclear Materials, 241-243, 149-166. [8] Boedo, J. (1999) Convection in the DIII-D Divertor, Evolved Packet System, NewYork. [9] Rozhansky, V., Voskoboynikov, V. and Schneider, R (2006) Modelling of radial electric field profile for different divertor configuration, Journal of Plasma Physics Control Fusion, 48, 1425-143. doi.10.1088/0741-3335/48/9/011 [10] Ide, S., Suzuki, T., Koide, Y., Takenage, H., Kamada, Y., Fujita, T. Shirai, H. and the JT-60 Team, (2004) Properties of internal transport barrier formation in JT-60U, Journal of Nuclear Fusion, 44, 876-882. doi.10.1088/0029-5515/44/8/006 [11] Bekheit, A.H. (2010) Simulation of the radial electric field shear in the edge plasma of small size divertor tokamak, Journal of Fusion Energy, 29, 267-270. doi.10.1007/s10894-009-9271-5
[1] Bekheit, A.H. (2008) Simulation of small size divertor tokamak plasma edge including self consistent electric field, Jouenal of Fusion Energy, 27, 338-345. doi.10.1007/s10894-008-9148-z [2] LaBombard, H., Hutchinson, B., Lipshultz, McCracken, G., Snipes J. and Terry J., (1995) The effects of field reversal on the Alcator C-Mod divertor, Journal of Plasma Physics Control Fusion, 37, 1389-1406. doi.10.1088/0741-3335/37/12/004 [3] Chankin, A.V. Stangeby, P.C., K, Erents, P. and Harbour, J., Lingertat, (1994) The effect of BT reversal on the asymmetries between the strike zones in single null divertor discharges: experiment and theories, Journal of Plasma Physics Control Fusion, 37, 1853-1864. doi.10.1088/0741-3335/36/11/011 [4] Schneider, R, Rozhansky, V. and Voskoboynikov, V. (2001) Simulation of tokamak edge plasma including self-consistent electric field, Journal of Nuclear Fusion, 41, 387. doi.10.1088/0029-5515/41/4/305 [5] Murphy, S.A. (2011) Glow Discharges and Tokamaks: Principles and Application of Small Size Divertor Tokamak, Nova Science Publisher, Hauppauge. [6] Rognlien, T.D., Ryutov, D. and Mattor, N. (1999) Influence of E x B and ?B drift terms in 2-D edge /SOL transport simulation, Journal of Nuclear Materials, 266- 269, 654-659. doi.10.1016/S0022-3115(98)00835-6 [7] Wolfe, S., LaBombard, H., Hutchinson, B., Lipshultz, G., McCracken, J., Snipes and Terry, J. (1997) Experimental investigation of transport phenomena in the Scrape Off layer and divertor, Journal of Nuclear Materials, 241-243, 149-166. [8] Boedo, J. (1999) Convection in the DIII-D Divertor, Evolved Packet System, NewYork. [9] Rozhansky, V., Voskoboynikov, V. and Schneider, R (2006) Modelling of radial electric field profile for different divertor configuration, Journal of Plasma Physics Control Fusion, 48, 1425-143. doi.10.1088/0741-3335/48/9/011 [10] Ide, S., Suzuki, T., Koide, Y., Takenage, H., Kamada, Y., Fujita, T. Shirai, H. and the JT-60 Team, (2004) Properties of internal transport barrier formation in JT-60U, Journal of Nuclear Fusion, 44, 876-882. doi.10.1088/0029-5515/44/8/006 [11] Bekheit, A.H. (2010) Simulation of the radial electric field shear in the edge plasma of small size divertor tokamak, Journal of Fusion Energy, 29, 267-270. doi.10.1007/s10894-009-9271-5