Kinetic simulations and photometry measurements of the E-H transition in cylindrical inductively coupled plasmas

S. Mattei, K. Nishida, S. Mochizuki, A. Grudiev, J. Lettry, M. Q. Tran, Akiyoshi Hatayama

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7 Citations (Scopus)

Abstract

Inductively coupled plasmas (ICP) are well known to exhibit two modes of operation: a low density capacitive E-mode and a high density inductive H-mode. In this study we investigate the E-H transition in a cylindrical ICP, and show the effect of an external magnetic cusp field on the transition dynamics. The plasma is simulated by an electro-magnetic particle-in-cell Monte Carlo collision code in order to take into account spatio-temporal variations of the plasma dynamics as well as kinetic effects. Simulations are compared to photometry measurements on the Linac4 H-ion source plasma chamber. We show that the E-H transition is characterized by strong spatial variations of the plasma parameters, with an axial plasma oscillation in E-mode followed by a centring in the coil region in H-mode. The external magnetic cusp field prevents electrons close to the wall to be accelerated and reduces the inductive power deposition in the plasma. This resulted in a ≈50% higher current to achieve E-H transition compared to the configuration without cusp field. The results indicate possible improvements to the magnetic cusp field configuration in order to achieve optimal power transfer.

Original languageEnglish
Article number065001
JournalPlasma Sources Science and Technology
Volume25
Issue number6
DOIs
Publication statusPublished - 2016 Oct 3

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Keywords

  • E-H transition
  • ICP
  • particle-In-Cell

ASJC Scopus subject areas

  • Condensed Matter Physics

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