Externally driven global Alfven eigenmodes applied for effective mass number measurement on TCABR

Autor(es)

Puglia, P. G. P. P. ^[1] ; Elfimov, A. G. ^[1] ; Ruchko, L. F. ^[1] ; Galvao, R. M. O. ^[1] ; Guimaraes-Filho, Z. ^[1] ; Ronchi, G. ^[1] ; Team, TCABR ^[2]

Afiliação do(s) autor(es)

^[1] Inst Fis, BR-05508090 Sao Paulo - Brazil

^[2] TCABR Team, Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physics of Plasmas; v. 21, n. 12 DEC 2014.
• Citações Web of Science: 2

Resumo

The excitation and detection of Global Alfven Eigenmodes on TCABR for diagnostic purposes are presented. The modes can be excited with one or two in-vessel antennae, with up to 15A of current in each, in the frequency range from 2 to 4 MHz. This scheme allows the estimation of the effective mass number at the plasma center, which value is affected by impurity concentration in the core. An amplifier based on MOSFETs is used to excite the waves driven by low power, in order to not change the basic plasma parameters. The variation of the GAE with density is verified and the location of the mode resonance at the plasma center is confirmed by the sawtooth beating, so that the correspondingly beating phase inversion improves the precision on the resonant condition determination. The toroidal parity of the modes N = 1,2 is determined by use of two opposite located antennae with different phase of the RF current. Knowledge of toroidal mode number is important as it identifies GAE location and defines the estimated effective mass value. The estimated value for A(eff) is similar to 1.4-1.5, corresponding to 5-7% of carbon impurity concentration. The measured value of A(eff) is used to estimate Z(eff), which is compared to older TCA experiments and the value obtained by the Spitzer conductivity. (C) 2014 AIP Publishing LLC. (AU)

• Processo FAPESP: 11/50773-0 - Núcleo de excelência em física e aplicações de plasmas
• Beneficiário: Ricardo Magnus Osório Galvão
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/52611-5 - Identificação e localização de ondas de Alfvén excitadas no plasma de um tokamak
• Beneficiário: Paulo Giovane Paschoali Pereira Puglia
• Linha de fomento: Bolsas no Brasil - Doutorado