In this work, we study spontaneous electron to ion root transitions in TJ-II using Langmuir probes. By scanning the probe position on a shot to shot basis, we reconstruct a spatiotemporal map of the evolution of important turbulent quantities in the plasma edge region. We pay particular attention to the evolution of the cross phase between transport-relevant variables, showing the spatiotemporal evolution of this quantity for the first time, revealing the outward propagation of the changes associated with the transition. We also compute the intermittence parameter, which allows us to conclude that the turbulence, although its amplitude increases, condenses in a reduced number of dominant modes and becomes less bursty. The causal relationship between variables is studied using the transfer entropy, clarifying the interactions between the main variables and offering a rather complete picture of the complex evolution of the plasma across the confinement transition.
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Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
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September 2021
Research Article|
September 02 2021
Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
B. Ph. van Milligen
;
B. Ph. van Milligen
a)
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
a)Author to whom correspondence should be addressed: [email protected]
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B. A. Carreras
;
B. A. Carreras
2
Departamento de Física, Universidad Carlos III
, Avda. de la Universidad 30, 28911 Leganés, Spain
3
Department of Physics, University of Alaska
, Fairbanks, 99775-5920 Alaska, USA
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I. Voldiner
;
I. Voldiner
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
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U. Losada
;
U. Losada
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
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C. Hidalgo
;
C. Hidalgo
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
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a)Author to whom correspondence should be addressed: [email protected]
Phys. Plasmas 28, 092302 (2021)
Article history
Received:
May 25 2021
Accepted:
August 10 2021
Citation
B. Ph. van Milligen, B. A. Carreras, I. Voldiner, U. Losada, C. Hidalgo, TJ-II Team; Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator. Phys. Plasmas 1 September 2021; 28 (9): 092302. https://doi.org/10.1063/5.0057791
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