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

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...

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Bibliographic Details
Published in:Physics letters. A 2016-03, Vol.380 (11-12), p.1189-1192
Main Authors: Puglia, P.G.P., Elfimov, A.G., Andriati, A.V., Galvão, R.M.O., Guimarães-Filho, Z.O., Ronchi, G., Ruchko, L.F.
Format: Article
Language:English
Subjects:
Antennas
Atomic properties
Carbon
Diagnostic systems
Diagnostics
Effective mass number
Excitation
Global Alfvén wave
Impurities
Impurity accumulation
Interferometers
Magnetohydrodynamics
Tokamak
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Summary: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. •A non-perturbative Alfvén diagnostic is used to find the mass number in ohmic discharges in TCABR tokamak.•Global Alfvén waves are excited by an external antenna fed by a low power generator at the minimum of the Alfvén continuum.•Comparing hydrogen and helium discharges, the composition of carbon, oxygen and iron impurities is determined.•The density profile defined reflectometer and interferometer data shows impurity accumulation in the plasma core.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2016.01.025