Multi-channel analog lock-in system for real-time motional Stark effect measurements

The motional Stark estark effect (MSE) diagnostic system developed to measure the plasma current density distribution in the Korea Superconducting Tokamak Advanced Research performs data analysis by applying Fourier transform algorithm using the Interactive Data Language (IDL) software after measure...

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Bibliographic Details
Published in:Fusion engineering and design 2020-10, Vol.159, p.111664, Article 111664
Main Authors: Wi, Hanmin, Ko, Jinseok, Chung, Jinil
Format: Article
Language:English
Subjects:
Algorithms
Archiving
Current distribution
Data analysis
Data processing
Density distribution
Diagnostic systems
Fourier transforms
Lock-in amplifier
Motional Stark effect
Pitch (inclination)
Plasma
Plasma control
Plasma currents
Plasma real-time control
Polarimetry
Real time
Stark effect
Time measurement
Tokamak devices
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Summary:The motional Stark estark effect (MSE) diagnostic system developed to measure the plasma current density distribution in the Korea Superconducting Tokamak Advanced Research performs data analysis by applying Fourier transform algorithm using the Interactive Data Language (IDL) software after measurement and digital archiving. However, in order to realize advanced plasma control aiming at the development of high performance tokamak operations, there has been a demand for the MSE diagnostic system capable of real-time pitch-angle measurement associated with a plasma control system (PCS). For real-time, multi-channel, and high-speed MSE data processing with high precision, an analog lock-in technique has been proposed and its feasibility has been demonstrated through the table-top tests using the photoelastic-modulator-base polarimetry. The prototype multi-channel analog lock-in system is ready for the plasma commissioning and the integration with the PCS.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2020.111664