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Updated: Jun 7, 2026
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Wide-field turbulence imaging with beam emission spectroscopy
G R McKee1, R J Fonck, M W Shafer
1University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. grmckee@wisc.edu
The Review of Scientific Instruments
|November 2, 2010
Summary
A new wide-field beam emission spectroscopy diagnostic on DIII-D images plasma turbulence dynamics. This high-sensitivity system provides detailed, time-resolved visualizations of density structures for improved fusion energy research.
Area of Science:
- Plasma physics
- Fusion energy research
- Spectroscopy
Background:
- Understanding plasma turbulence is crucial for achieving controlled fusion.
- Previous diagnostics had limitations in spatial resolution and coverage.
- Long-wavelength density turbulence affects plasma confinement.
Purpose of the Study:
- To develop and implement an advanced diagnostic for imaging plasma turbulence.
- To capture time-resolved dynamics of turbulence structures in detail.
- To provide critical data for validating turbulence models.
Main Methods:
- Utilized an expanded, high-sensitivity, wide-field beam emission spectroscopy (BES) diagnostic.
- Configured a 64-channel BES system in an 8x8 grid for detailed imaging.
- Scanned the imaging region across plasma radii from core to scrape-off-layer.
Main Results:
- Successfully imaged size, shape, and dynamics of long-wavelength density turbulence.
- Captured time-averaged and time-resolved turbulence behavior.
- Obtained data covering multiple correlation lengths with matched channel shapes.
Conclusions:
- The wide-field BES diagnostic enables comprehensive 2D spatial correlation function sampling.
- Provides critical insights into turbulence dynamics in various plasma regions.
- Advances the study of plasma turbulence for fusion applications.
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