Mass number identification by Alfvén wave diagnostics in hydrogen and helium plasmas in TCABR

P. G.P. Puglia, A. G. Elfimov, A. V. Andriati, R. M.O. Galvão, Z. O. Guimarães-Filho, G. Ronchi, L. F. Ruchko

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Abstract

The mass number is obtained through the identification of the Global Alfvén (GA) wave resonances in ohmic plasma discharges in the TCABR tokamak. By comparing hydrogen and helium discharges, the composition of carbon, oxygen, and iron impurities is determined. The non-perturbative Alfvén diagnostic is used that is based on the excitation of GA waves by an external antenna fed by a low power generator, in the frequency band swept just below the minimum of the Alfvén wave continuum. Odd or even toroidal modes are excited by selecting the current phase in the two antenna modules separated by 180 degrees in the toroidal direction. The density profile, determined from cross analysis of reflectometer and interferometer data, shows impurity accumulation in the plasma core.

Original languageEnglish
Pages (from-to)1189-1192
Number of pages4
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume380
Issue number11-12
DOIs
StatePublished - Mar 11 2016
Externally publishedYes

Funding

This work was supported by FAPESP (Research Foundation of the State of São Paulo), contract 2011/50773-0 , and by CNPq (National Council of Scientific and Technological Development) contracts 480733/2013-9 and 307511/2011-1 , Brazil.

Keywords

  • Diagnostics
  • Effective mass number
  • Global Alfvén wave
  • Impurity accumulation
  • Tokamak

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