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Updated: Apr 20, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Design of interferometer system for Keda Torus eXperiment using terahertz solid-state diode sources.

Jinlin Xie1, Haibo Wang1, Weixing Ding1

  • 1School of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The Review of Scientific Instruments
|November 29, 2014
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Summary

A new solid-state terahertz (THz) interferometer system was developed for the Keda Torus eXperiment (KTX). This diagnostic tool achieves high sensitivity and temporal resolution for plasma measurements.

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Area of Science:

  • Plasma Physics
  • Terahertz (THz) Technology
  • Diagnostic Systems

Background:

  • Accurate plasma density measurements are crucial for understanding fusion devices like the Keda Torus eXperiment (KTX).
  • Traditional diagnostic methods may face limitations in sensitivity or temporal resolution for dynamic plasma conditions.

Purpose of the Study:

  • To design, characterize, and validate a novel solid-state terahertz (THz) interferometer diagnostic system for the KTX.
  • To achieve high sensitivity and temporal resolution for multichannel plasma density measurements.

Main Methods:

  • Utilized a solid-state source-based THz interferometer operating at 0.650 THz.
  • Employed a frequency multiplier (X48) for the probing beam and a tunable solid-state diode source for the local oscillator.
  • Incorporated high-sensitivity planar-diode mixers (∼750 mV/mW) in a heterodyne detection system.

Main Results:

  • Achieved a minimum electron density sensitivity of ⟨nel⟩min = 4.5 × 10(16) m(-2).
  • Demonstrated a temporal resolution of 0.2 μs during initial bench tests.
  • The system enables multichannel interferometry with low phase noise.

Conclusions:

  • The designed solid-state THz interferometer system is effective for KTX plasma diagnostics.
  • The system meets the requirements for high-sensitivity and fast temporal resolution plasma measurements.
  • This advancement offers a robust tool for future fusion research.