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Development of a non-linear rf sheath benchmark suite

POSTER

Abstract

The Bohm sheath on plasma facing components (PFCs) can be energized through rectification by RF waves that reflect off of the PFCs. This can create voltages in excess of 100 V that are sufficient to cause impurities to sputter the surface. The modeling of this effect is a very active area of research. In this poster we present cases that have been benchmarked across several codes using different approaches. Many of these cases were first shown in Kohno Comp. Phys. Comm. (2017). We demonstrate consistency of the solution to high accuracy independent of approach. Cases include non-linear sheaths in 1D and 2D and the sheath plasma wave. These cases should serve as a benchmark suite for developers.

Publication: "A finite element procedure for radio-frequency sheath–plasma interactions based on a sheath impedance model"<br>H. Kohno, J.R. Myra, CPC (2017)<br><br>"RF sheath induced sputtering on Proto-MPEX part 1: sheath equivalent dielectric layer for modeling the RF sheath"<br>Author: Clyde Beers, D. L. Green, Cornwall Lau, James Myra, Juergen Rapp, Timothy Younkin, and Steven Zinkle - under review<br><br>"Development of a non-linear rf sheath benchmark suite", J. Wright, C. Migliore (MIT PSFC),J. Myra (Lodestar),D. Curreli (UIUC),D. Smithe and T. Jenkins (Tech-X),M. Stowell (LLNL),D. Green, C. Beers, and T. Younkin (ORNL),S. Shiraiwa, N. Bertelli, M. Poulos (PPPL),H. Kohno (Kyutech [Kyushu Institute of Technology]) - in preparation<br>

Presenters

  • John C Wright

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MI, MIT PSFC

Authors

  • John C Wright

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MI, MIT PSFC

  • Christina Migliore

    Massachusetts Institute of Technology MI

  • James R Myra

    Lodestar Research Corporation

  • Davide Curreli

    University of Illinois at Urbana-Champaign

  • David N Smithe

    Tech-X Corporation, Tech-X Corp

  • Thomas G Jenkins

    Tech-X Corporation

  • Mark L Stowell

    Lawrence Livermore Natl Lab

  • David L Green

    Oak Ridge National Lab

  • Clyde J Beers

    University of Tennessee

  • Tim Younkin

    Oak Ridge National Lab

  • Syun'ichi Shiraiwa

    Princeton Plasma Physics Laboratory, PPPL

  • Nicola Bertelli

    PPPL, Princeton University, Princeton University / Princeton Plasma Physics Laboratory, Princeton Plasma Physics Laboratory

  • Matthew J Poulos

    California State University, Los Angeles, Princeton Plasma Physics Laboratory

  • Haruhiko Kohno

    Kyushu Institute of Technology