Simulation of Lower Hybrid Current Drive for DEMO

Ali Asghar Molavi  Choobini; Ahmad  Naghidokht; Zahra  Karami

doi:10.4236/wjnst.2014.44024

Ali Asghar Molavi Choobini¹^*, Ahmad Naghidokht², Zahra Karami³

Abstract: Lower hybrid (LH) wave is not only convenient to generate a flat or reversed magnetic shear profiles, but also helps one to explore scenarios for steady-state tokamak operation with improved confinement. Here with LSC code (lower hybrid simulation code), we calculate density and temperature profiles, relative power of injected wave and current wave lunch for two options of DEMO at the launched LH wave frequency 5 GHz. Two plasma scenarios pertaining to two different DEMO options, known as pulsed (option 1) and steady-state (option 2) models, have been analyzed. We perceive that power deposition by using lower hybrid wave injection mainly takes place near the edge of plasma and approximately in more peripheral region for both of options but has approximately higher efficiency for option 1 compared to option 2. About current wave lunch, a major part of that is close to the plasma edge for both of options. We have some considerable parts that reach to internal layers for option 1 and then current drive mainly takes place in a wider, more peripheral region for option 1.

Keywords: Lower Hybrid Waves, Tokamak, Current Drive, Fokker-Planck Equation

Cite this paper: Choobini, A. , Naghidokht, A. and Karami, Z. (2014) Simulation of Lower Hybrid Current Drive for DEMO. World Journal of Nuclear Science and Technology, 4, 189-194. doi: 10.4236/wjnst.2014.44024.

References

[1] Decker, J., Peysson, Y., Hillairet, J., Artaud, J.F., Basiuk, V., et al. (2011) Calculation of Lower Hybrid Current Drive in ITER. Nuclear Fusion, 51, Article ID: 073025.
http://dx.doi.org/10.1088/0029-5515/51/7/073025

[2] Gormezano, C., Sips, A.C.C., Luce, T.C., Ide, S., Becoulet, A., Litaudon, X., et al. (2007) Steady State Operation. Nuclear Fusion, 47, S285.
http://dx.doi.org/10.1088/0029-5515/47/6/S06

[3] Cesario, R., amicucci, L., Cardinali, A., Castaldo, C., Marinucci, M., et al.; the FTU Team (2010) Current Drive at Plasma Densities Required for Thermonuclear Reactors. Nature Communications, 1, 274.

[4] Ceccuzzi, S., Barbato, E., Cardinal, A., et al. (2013) Lower Hybrid Current Drive for DEMO. Physics Assessment and Technology Maturity. Fusion Science and Technology, 64, 748.

[5] Pericoli, R.V., Bibet, PH., Mirizzi, F., Apicella, M.L., Barbato, E., Buratti, P., Calabro, G., et al. (2005) LHCD and Coupling Experiments with an ITER-Like PAM Launcher on the FTU Tokamak. Nuclear Fusion, 45, 1085.
http://dx.doi.org/10.1088/0029-5515/45/9/008

[6] Ekrdhal, A., delpech, L., Goniche, M., Guilhem, D., Hillairet, J., Preynas, M., et al. (2010) Validation of the ITERRelevant Passive-Active-Multijunction LHCD Launcher on Long Pulses in Tore Supra. Nuclear Fusion, 50 Article ID: 112002.
http://dx.doi.org/10.1088/0029-5515/50/11/112002

[7] Hoang, G.T., Becoulet, A., Jacquinot, J., Artaud, J.F., Bae, Y.S., Beaumont, B., et al. (2009) A Lower Hybrid Current Drive System for ITER. Nuclear Fusion, 49, Article ID: 075001.
http://dx.doi.org/10.1088/0029-5515/49/7/075001

[8] Poli, E., Tardind, G., Zohm, H., Fable, E., Farina, D., Figini, L., Marushchenko, N.B. and Porte, L. (2013) Electron Cyclotron Current Drive Efficiency in DEMO Plasmas. Nuclear Fusion, 53, Article ID: 013011.
http://dx.doi.org/10.1088/0029-5515/53/1/013011

[9] Ignat, D.W. and Redd, A.J. (2000) Lower Hybrid Simulation Code Manual. Plasma Physics Laboratory, Princeton University, Princeton.

[10] Barbato, E. and Santini, F. (1991) Quasi-Linear Absorption of Lower Hybrid Waves by Fusion-Generated Alpha Particles. Nuclear Fusion, 31, 673.
http://dx.doi.org/10.1088/0029-5515/31/4/005