Related Experiment Video
Updated: Jul 8, 2025
07:14
Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
Published on: May 1, 2018
7.8K
An E-band multi-channel Doppler backscattering system on EAST.
1School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China.
The Review of Scientific Instruments
|December 18, 2023
Summary
A new E-band Doppler backscattering system on EAST measures plasma turbulence at five locations. This advanced diagnostic tool offers flexible frequency selection and adjustable angles for detailed turbulence studies.
Area of Science:
- Plasma physics
- Fusion energy research
- Microwave diagnostics
Background:
- Turbulence significantly impacts plasma confinement in fusion devices.
- Accurate measurement of turbulence is crucial for understanding and controlling plasma behavior.
- Existing diagnostic systems may have limitations in spatial resolution or flexibility.
Purpose of the Study:
- To introduce a novel multi-channel Doppler backscattering (DBS) system for plasma turbulence measurement.
- To detail the hardware design and capabilities of the E-band DBS system on the Experimental Advanced Superconducting Tokamak (EAST).
- To present initial results and demonstrate the system's effectiveness in analyzing plasma turbulence.
Main Methods:
- Installation of an E-band (60-90 GHz) multi-channel DBS system with X-mode polarization on EAST.
- Utilizing 31 fixed microwave frequencies (1 GHz interval) and a tunable reference signal for probing.
- Employing ray tracing simulations to determine scattering locations and perpendicular wavenumber (k⊥).
Main Results:
- Simultaneous measurement of plasma turbulence at five radial locations.
- Flexible selection of probing signals tunable in the E-band, adjustable in one shot or between shots.
- Achieved wavenumber range of 4-25 cm⁻¹ with a resolution of Δk/k ≤ 0.35.
Conclusions:
- The new E-band DBS system is a powerful diagnostic for studying plasma turbulence on EAST.
- The system's flexibility in frequency and angle adjustment enhances its utility for various experimental conditions.
- Initial results demonstrate the system's capability to provide detailed insights into plasma turbulence dynamics.
Related Concept Videos
01:05Doppler Effect - II
3.4K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
3.4K
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
230
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
230