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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Burst temperature from conditional analysis in Texas Helimak and TCABR tokamak

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Author(s):
Pereira, F. A. C. [1] ; Hernandez, W. A. [1, 2] ; Toufen, D. L. [3] ; Guimaraes-Filho, Z. O. [1] ; Caldas, I. L. [1] ; Gentle, K. W. [4, 5]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Phys, BR-05315970 Sao Paulo, SP - Brazil
[2] Univ Los Llanos, Fac Ciencias Basicas & Ingn, Villavicencio 500017 - Colombia
[3] Fed Inst Educ Sci & Technol Sao Paulo, BR-07115000 Guarulhos, SP - Brazil
[4] Univ Texas Austin, Dept Phys, Austin, TX 78712 - USA
[5] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 - USA
Total Affiliations: 5
Document type: Journal article
Source: Physics of Plasmas; v. 25, n. 4 APR 2018.
Web of Science Citations: 1
Abstract

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. Published by AIP Publishing. (AU)

FAPESP's process: 11/19296-1 - Nonlinear dynamics
Grantee:Iberê Luiz Caldas
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/07043-0 - Analysis of turbulence and structures propagation on plasma
Grantee:Felipe Augusto Cardoso Pereira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/50122-0 - Dynamic phenomena in complex networks: basics and applications
Grantee:Elbert Einstein Nehrer Macau
Support type: Research Projects - Thematic Grants