Modeling powder injection experiments in LHD with the DIS and DUSTT codes

POSTER

Abstract

Recent boron powder injection experiments performed on the Large Helical Device (LHD) have shown beneficial effects on plasma performance through real-time wall conditioning [1, 2]. Several diagnostic measurements and modeling with EMC3-EIRENE and DUSTT codes suggest deeper penetration of B powder grains into low-density plasmas, making them a better candidate for boronization applications [3,4]. Correct modeling of the dust trajectory is fundamental for the correct interpretation of this kind of experiment. To this end, the Dust Injection Simulation (DIS) was recently developed, with the capability of handling 3D, time-varying plasma backgrounds [5]. To determine the dust grain trajectory, DIS solves Newton's equation, along with the equations for dust electric charge, temperature, and evaporation rate. Here we present the comparison of results gained from DIS and from the more established DUSTT code [6], using EMC3-EIRENE [7,8] simulations from the LHD serving as the 3D plasma background. Preliminary results show a qualitative agreement between the two codes.

*This work was conducted within the framework of the NIFS/PPPL International Collaboration, and it is supported by the U.S. DOE under Contract No. DE-AC02-09CH11466 with Princeton University. This work was made possible by funding from the U.S Department of Energy for the Summer Undergraduate Laboratory Internship (SULI) program.

Publication: [1] F. Nespoli et al., Nuclear Materials and Energy 2020
[2] F. Nespoli et al., APS DPP 2020
[3] M. Shoji et al., Contributions to Plasma Physics 2019
[4] M. Shoji et al., Nuclear Materials and Energy 2020
[5] F. Nespoli et al, Physics of Plasmas 2021
[6] R. Smirnov et al., Plasma Physics and Controlled Fusion 2007
[7] Y. Feng et al., Plasma Phys. Control. Fusion 44 (2002) 611.
[8] G. Kawamura et al., Contrib. Plasma Phys. 54 (2014) 437.

Presenters

  • RAHUL BANKA

    • Baylor University

Authors

  • RAHUL BANKA

    • Baylor University

  • Federico Nespoli

    • Princeton Plasma Physics Laboratory

  • Mamoru Shoji

    • National Institute for Fusion Science, Japan
    • Natl Inst Fusion Science-Toki

  • Gakushi Kawamura

    • National Institute for Fusion Science, Japan
    • National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan
    • Natl Inst Fusion Science-Toki