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Effects of the Plasma Blob Nonlinear Formation/Transport on Impurity Transport in the SOL Regions

Tomoyuki MAEDA, Hiroki HASEGAWA^1,2), Seiji ISHIGURO^1,2), Kazuo HOSHINO and Akiyoshi HATAYAMA

Graduate School of Science and Technology, Keio University, Yokohama 223-8522, Japan

1)

National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences (NINS), Toki 509-5292, Japan

2)

Department of Fusion Science, SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan

(Received 28 December 2018 / Accepted 6 May 2019 / Published 24 July 2019)

Abstract

The purpose of this study is to make clear the effects of the plasma blob on the impurity transport in the Scrape-Off Layer (SOL) regions. By using the two-dimensional (2D) interchange turbulence model with plasma transport along magnetic field line, we have simulated the plasma blob formation and transport in the SOL regions. We have studied the effects of the plasma blob on the impurity transport by using impurity equations of motion in the trace impurity limit. The results show that the plasma blob transport direction is not only the radial direction but also poloidal direction due to the plasma transport along the magnetic field line. Also, the impurity ions are transported radially outward with the plasma blob transport and the velocity of the impurity ions transport is the same order to the plasma blob velocity radially outward. These results implied that the impurity transport with the plasma blob may possibly be not only diffusion but also convection. Moreover, this motion of the impurity ions seems like eddy motion. As a next step, we study relation between this eddy motion of impurity ions and the plasma blob motion. That is our future work.

Copyright (c) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

plasma blob, non-diffusion, two-dimensional interchange turbulence model, impurity transport, test particle model

DOI: 10.1585/pfr.14.3403133

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References

• [1] S.I. Krasheninnikov et al., J. Plasma Phys. 74, 679 (2008).
• [2] S.I. Krasheninnikov, Phys. Lett. A 283, 368 (2001).
• [3] S.I. Krasheninnikov et al., Nucl. Fusion 57, 102010 (2017).
• [4] G.Q. Yu et al., Phys. Plasmas 10, 4413 (2003).
• [5] J.R. Myra et al., Phys. Plasmas 11, 4267 (2004).
• [6] N. Ohno, J. Plasma Fusion Res. 82, 205 (2006).
• [7] M.V. Umansky et al., Phys. Plasmas 5, 3373 (1998).
• [8] J.A. Boedo et al., Phys. Plasmas 10, 1670 (2003).
• [9] H. Hasegawa et al., Nucl. Fusion 57, 116008 (2017).
• [10] S. Ishiguro et al., J. Plasma Phys. 72, 1233 (2006).
• [11] H. Hasegawa et al., Plasma Fusion Res. 7, 2401060 (2012).
• [12] H. Hasegawa et al., Phys. Plasmas 22, 102113 (2015).
• [13] T. Maeda et al., Contrib. Plasma Phys. 58, 505 (2018).
• [14] N. Bisai et al., Phys. Plasmas 11, 4018 (2004).
• [15] N. Bisai et al., Phys. Plasmas 12, 102515 (2005).
• [16] S. Sugita et al., Theor. Appl. Mech. Jpn. 57, 207 (2009).
• [17] S. Yamoto et al., Nucl. Fusion 57, 116051 (2017).
• [18] A. Einstein, Annalen der Physik 17, 549 (1905).