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.
Skip Nav Destination
Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
,
,
,
,
,
CHORUS
Article navigation
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]
Search for other works by this author on:
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
Search for other works by this author on:
I. Voldiner
;
I. Voldiner
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
Search for other works by this author on:
U. Losada
;
U. Losada
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
Search for other works by this author on:
C. Hidalgo
;
C. Hidalgo
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
Search for other works by this author on:
B. Ph. van Milligen
1,a)
B. A. Carreras
2,3
I. Voldiner
1
U. Losada
1
C. Hidalgo
1
TJ-II Team
1
National Fusion Laboratory, CIEMAT
, Avda. Complutense 40, 28040 Madrid, Spain
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
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
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
Progress toward fusion energy breakeven and gain as measured against the Lawson criterion
Samuel E. Wurzel, Scott C. Hsu
A review of plasma acceleration and detachment mechanisms in propulsive magnetic nozzles
Kunlong Wu, Zhiyuan Chen, et al.
Comparison of laser-produced plasma spatio-temporal electron density evolution measured using interferometry with simulation results
Mathew P. Polek, Tirtha R. Joshi, et al.
Related Content
The effect of pellet injection on turbulent transport in TJ-II
Phys. Plasmas (September 2023)
The causal relation between turbulent particle flux and density gradient
Phys. Plasmas (July 2016)
Correlation of ion acoustic turbulence with self-organization in a low-temperature plasma
Phys. Plasmas (August 2019)
Causal impact of magnetic fluctuations in slow and fast L–H transitions at TJ-II
Phys. Plasmas (July 2016)
Causal analysis among azimuthal Fourier modes in linear plasma based on multivariate time series models
Phys. Plasmas (August 2024)