The procedure to estimate the average local temperature, density, and plasma potential by conditionally selecting points of the Langmuir probe characteristic curve is revised and applied to the study of intermittent bursts in the Texas Helimak and TCABR tokamak. The improvements made allow us to distinguish the burst temperature from the turbulent background and to study burst propagation. Thus, in Texas Helimak, we identify important differences with respect to the burst temperature measured in the top and the bottom regions of the machine. While in the bottom region the burst temperatures are almost equal to the background, the bursts in the top region are hotter than the background with the temperature peak clearly shifted with respect to the density one. On the other hand, in the TCABR tokamak, we found that there is a temperature peak simultaneously with the density one. Moreover, the radial profile of bursts in the top region of Helimak and in the edge and scrape-off layer regions of TCABR shows that in both machines, there are spatial regions where the relative difference between the burst and the background temperatures is significant: up to 25% in Texas Helimak and around 50% in TCABR. However, in Texas Helimak, there are also regions where these temperatures are almost the same.
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April 2018
Research Article|
April 02 2018
Burst temperature from conditional analysis in Texas Helimak and TCABR tokamak
F. A. C. Pereira
;
F. A. C. Pereira
1
Institute of Physics, University of São Paulo
, São Paulo, São Paulo 05315-970, Brazil
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W. A. Hernandez;
W. A. Hernandez
1
Institute of Physics, University of São Paulo
, São Paulo, São Paulo 05315-970, Brazil
2
Facultad de Ciencias Básicas e Ingenierías, Universidad de los Llanos
, Villavicencio 500017, Colombia
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D. L. Toufen
;
D. L. Toufen
3
Federal Institute of Education, Science and Technology of São Paulo - IFSP
, Guarulhos, São Paulo 07115-000, Brazil
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Z. O. Guimarães-Filho
;
Z. O. Guimarães-Filho
1
Institute of Physics, University of São Paulo
, São Paulo, São Paulo 05315-970, Brazil
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I. L. Caldas;
I. L. Caldas
1
Institute of Physics, University of São Paulo
, São Paulo, São Paulo 05315-970, Brazil
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K. W. Gentle
K. W. Gentle
4
Department of Physics and Institute for Fusion Studies, The University of Texas at Austin
, Austin, Texas 78712, USA
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Phys. Plasmas 25, 042301 (2018)
Article history
Received:
February 06 2018
Accepted:
March 19 2018
Citation
F. A. C. Pereira, W. A. Hernandez, D. L. Toufen, Z. O. Guimarães-Filho, I. L. Caldas, K. W. Gentle; Burst temperature from conditional analysis in Texas Helimak and TCABR tokamak. Phys. Plasmas 1 April 2018; 25 (4): 042301. https://doi.org/10.1063/1.5025062
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