Speaker
Description
A two-dimensional microwave imaging reflectometry (MIR) system has been
commissioned on the Experimental Advanced Superconducting Tokamak (EAST) to
characterize 2-D electron density fluctuations. The diagnostic operates in the W-band
(75–110 GHz) and employs a 12-channel poloidal receiver array combined with 8
frequency-tunable sources, providing 96 simultaneous measurement points with full
radial coverage across the pedestal region. This configuration enables the direct
measurement of key fluctuation properties, including the poloidal wavenumber,
wavelength, rotation velocity, and radial correlation length. Systematic research has
been conducted covering table-top experiments of the MIR system, studies on
forward modeling methods, development of signal processing algorithms, and field
debugging on the EAST device. Initial experimental results from the 2024–2025
campaigns will be presented, focusing on the dynamics of pedestal transport. The
MIR system substantially advances the diagnostic capability on EAST, offering new
insights into the underlying mechanisms governing pedestal stability and cross-field
transport.
| Keyword-1 | fusion |
|---|---|
| Keyword-2 | diagnostics |