An extended kinetic model for the thermal force on impurity particles in weakly collisional plasmas. Issue 6 (10th April 2018)

• Record Type: Journal Article
• Authors: Homma, Yuki; Hoshino, Kazuo; Tokunaga, Shinsuke; Yamoto, Shohei; Hatayama, Akiyoshi; Asakura, Nobuyuki; Sakamoto, Yoshiteru; Tobita, Kenji
• Other Names: Marandet Y. guestEditor.; Ciraolo G. guestEditor.; Rosato J. guestEditor.; Serre E. guestEditor.
• Is Part Of: Contributions to plasma physics. Volume 58:Issue 6/7/8(2018)
• Page Start: 629
• Page End: 637
• Publication Date: 2018-04-10
• Subjects: collisionality -- heat flux limiter -- impurity -- thermal force -- transport simulation; Plasma (Ionized gases) -- Periodicals; Electronic journals; 530.44
• DOI: 10.1002/ctpp.201700173
• Languages: English
• ISSNs: 0863-1042

Abstract

Abstract : We have developed an extended kinetic model for the thermal force F ∇ ∥ T on test impurity particles in plasmas. This model makes use of a combination of the plasma ion heat fluxq GM derived from the generalized moment equations (E. Zawaideh et al., Phys. Fluids 1988, 31) and the numerical algorithm presented earlier (Y. Homma, A. Hatayama, J. Comput. Phys .2013, 250). The applicable condition extends from collisional to weakly collisional plasmas, and F ∇ ∥ T weakens when the plasma collisionality decreases. A test simulation is performed assuming a tentative weakly collisional plasma. The results show that it can have a non‐negligible influence on transient impurity transport in a DEMO‐scale tokamak to take into account the effect of plasma collisionality in thermal force modelling.