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Related Experiment Video

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Trajectory Data Analyses for Pedestrian Space-time Activity Study

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Integrated data analysis at TJ-II: the density profile.

B Ph van Milligen¹, T Estrada, E Ascasíbar

¹Asociación EURATOM-CIEMAT para Fusión, Avda. Complutense 22, 28040 Madrid, Spain.

The Review of Scientific Instruments

|August 3, 2011

Summary

This study introduces an integrated data analysis system for the TJ-II stellarator, resolving ambiguities in electron density profile reconstruction using Bayesian inference and multiple diagnostics.

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Area of Science:

Plasma physics
Fusion energy research
Data science

Background:

Accurate electron density profiles are crucial for understanding plasma behavior in fusion devices like the TJ-II stellarator.
Profile reconstruction from diagnostics can suffer from inherent ambiguities, particularly with reflectometry data.

Purpose of the Study:

To develop and present an integrated data analysis system for the TJ-II stellarator.
To resolve ambiguities in electron density profile reconstruction, specifically from reflectometry data.
To demonstrate the system's application across various plasma conditions.

Main Methods:

Utilized Bayesian inference for integrated data analysis.
Combined data from interferometry, reflectometry, Thomson scattering, and Helium beam diagnostics.
Developed a novel method to address reflectometry profile reconstruction ambiguities.

Main Results:

Successfully reconstructed electron density profiles at single time points.
Demonstrated the resolution of reflectometry ambiguities through the integrated approach.
Applied the technique to low-density (with/without electrode biasing) and high-density (L-H transition) discharges.

Conclusions:

The integrated Bayesian analysis system effectively reconstructs electron density profiles for the TJ-II stellarator.
The developed method successfully overcomes ambiguities in reflectometry data.
The system is robust and applicable to diverse plasma regimes relevant to fusion research.