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Development of a toroidally resolved broadband ECE imaging system for measurement of turbulent fluctuations on the KSTAR.
- Source :
- Review of Scientific Instruments; Aug2024, Vol. 95 Issue 8, p1-6, 6p
- Publication Year :
- 2024
-
Abstract
- The two electron cyclotron emission imaging (ECEI) systems installed at adjacent ports (G and H) on the KSTAR tokamak incorporate large-aperture mm-wave optics, broadband electronics, and high speed digitization (up to 1 MSa/s) for 2D and quasi-3D visualization of MHD-scale fluid dynamics. Recently, the ECEI systems have been proved to be capable of visualization of smaller scale fluctuations albeit with a limited spatiotemporal resolution and even capable of measurement of ion cyclotron harmonic waves by direct high-speed sampling of the ECE IF signals. A four-channel prototype subsystem with a higher sampling rate up to 16 GS/s has been integrated into the G-port ECEI system, enabling the measurement of plasma waves in the GHz range in the form of modulated ECE signals and characterization of high-frequency turbulence during the evolution of pedestal. To achieve higher toroidal resolution in the turbulence measurement, the H-port ECEI system is now being upgraded to have a toroidally dual detector array of 2(toroidal) × 12(vertical) × 8(radial) channel configuration and a high-speed subsystem of 2(toroidal) × 4 channel configuration. The new mm-wave optics has been designed via beam propagation simulation, and the measured performance of the fabricated lens indicates a toroidal resolution of 8–10 cm depending on the focus position and zoom factor, allowing for the measurement of parallel wavenumber up to k<subscript>‖</subscript> ∼ 0.8 cm<superscript>−1</superscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- PLASMA waves
FLUID dynamics
ELECTRON emission
IMAGING systems
TOKAMAKS
Subjects
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 95
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 179372487
- Full Text :
- https://doi.org/10.1063/5.0219245