Plasma and Fusion Research

Volume 11, 2403040 (2016)

Regular Articles

Observation of the Strong Temperature Gradient in Detached Plasma by PIC Simulation with Monte Carlo Collision
Theerasarn PIANPANIT1), Seiji ISHIGURO1,2) and Hiroki HASEGAWA1,2)
1)
Department of Fusion Science, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 30 November 2015 / Accepted 9 February 2016 / Published 15 April 2016)

Abstract

In this work, the 1D-3V particle simulation with Monte Carlo collision and cumulative scattering angle Coulomb collision was developed to study the kinetic behavior of the detached plasma. The constant pressure and temperature of the neutral gas box in front of the divertor target were used in the simulation. The simulation was performed with a fixed upstream plasma density nu ∼ 3 × 1018 m−3 and a modified large Coulomb collision frequency. When the neutral gas pressure is increased, there is a strong decrease in the electron temperature inside the neutral gas box. The electron temperature in front of the divertor target also decreases to below 1 eV, which is one of the conditions for detached plasma.

Keywords

detached plasma, particle simulation, scrape-off layer, parallel transport, divertor

DOI: 10.1585/pfr.11.2403040

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References

  • [1] G.F. Matthews, J. Nucl. Mater. 220-222, 104 (1995).
  • [2] W.L. Hsu, M. Yamada and P.J. Barrett, Phys. Rev. Lett. 49, 1001 (1982).
  • [3] N. Ohno et al., Nucl. Fusion 41, 1055 (2001).
  • [4] O.V. Batishchev et al., Phys. Plasmas 4, 1672 (1997).
  • [5] W.S. Lawson, J. Comput. Phys. 80, 253 (1989).
  • [6] G.A. Emmert et al., Phys. Fluids 23, 803 (1980).
  • [7] R.J. Procassini, C.K. Birdsall and B.I. Cohen, Nucl. Fusion 30, 2329 (1990).
  • [8] R.K. Janev, Atomic and Molecular Processes in Fusion Edge Plasmas (Plenum Press, New York, 1995).
  • [9] R.K. Janev, D. Reiter and S. Samm, Collision Processes in Low-Temperature Hydrogen Plasmas (JUEL-4105, 2003).
  • [10] V. Vahedi and M. Surendra, Comput. Phys. Commun. 87, 179 (1995).
  • [11] K. Nanbu, Phys. Rev. E 55, 4642 (1997).
  • [12] T. Takizuka and H. Abe, J. Comput. Phys. 25, 205 (1977).
  • [13] N. Ezumi et al., J. Nucl. Mater. 241-243, 349 (1997).
  • [14] P.C. Stangeby, The Plasma Boundary of Magnetic Fusion Devices (Taylor & Francis Group, New York, 2000) p.399.
  • [15] S.I. Krasheninnikov et al., Phys. Plasmas 4, 1638 (1997).
  • [16] N. Ohno et al., Phys. Rev. Lett. 81, 818 (1998).
  • [17] K. Nanbu and K. Denpoh, J. Phys. Soc. Jpn. 67, 1288 (1998).