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

Author(s)

Puglia, P. G. P. ^[1] ; Elfimov, A. G. ^[1] ; Andriati, A. V. ^[1] ; Galvao, R. M. O. ^[1] ; Guimaraes-Filho, Z. O. ^[1] ; Ronchi, G. ^[1] ; Ruchko, L. F. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Phys, Rua Matao Travessa R 187, BR-05508090 Sao Paulo - Brazil

• Document type: Journal article
• Source: Physics Letters A; v. 380, n. 11-12, p. 1189-1192, MAR 11 2016.
• Web of Science Citations: 0

Abstract

The mass number is obtained through the identification of the Global Alfven (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 Alfven 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 Alfven 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. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 11/50773-0 - Center of excellence in physics and applications of plasmas
• Grantee: Ricardo Magnus Osório Galvão
• Support Opportunities: Research Projects - Thematic Grants