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Related Experiment Video

Updated: Feb 3, 2026

Voltage and Calcium Dual Channel Optical Mapping of Cultured HL-1 Atrial Myocyte Monolayer

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Published on: March 23, 2015

Multipoint vertical-Thomson scattering diagnostic on HL-2A tokamak.

Y Huang¹, Y Q Wang¹, Z P Hou¹

¹Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.

The Review of Scientific Instruments

|November 8, 2018

Summary

Advancements in multipoint Thomson scattering (TS) diagnostics for HL-2A tokamak experiments have improved hardware and laser alignment. This enables precise measurements of plasma electron temperature and density in upcoming campaigns.

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Area of Science:

* Fusion energy research
* Plasma physics diagnostics
* Tokamak experimental analysis

Background:

* Development of multipoint Thomson scattering (TS) diagnostic for HL-2A tokamak.
* Need for improved signal processing and laser alignment for accurate plasma measurements.

Purpose of the Study:

* To enhance the multipoint Thomson scattering diagnostic system for HL-2A.
* To enable 15-point measurements of plasma electron temperature and density.

Main Methods:

* Improved silicon avalanche photodiode detector electronics with two output channels.
* Motorized stages for precise laser beam alignment through narrow divertor throats.
* Installation of new fast digitizer modules with over 100 channels.

Main Results:

* Successful testing of new electronics, obtaining TS signals from both channels.
* Reduced stray laser light through improved beam alignment.
* Digitization of signals using 12-bit transient recorders at 1 GS/s.

Conclusions:

* The enhanced TS diagnostic system is ready for operation in the upcoming HL-2A campaign.
* The improvements pave the way for detailed plasma characterization.
* This advancement supports progress in tokamak physics experiments.