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9–12 Sept 2025
Fudan University, Shanghai, China
Europe/Vienna timezone

Validation and comparison of FPGA-based real-time Thomson Scattering data processing against offline analysis methods

10 Sept 2025, 12:05
25m
Auditorium Hall HGX 102 (Guanghua Twin Tower) (Fudan University, Shanghai, China)

Auditorium Hall HGX 102 (Guanghua Twin Tower)

Fudan University, Shanghai, China

220 Handan Road, Yangpu District, Shanghai, China 邯郸路 220 号 复旦大学
Oral (Regular) Data Analysis for Feedback Control Data Analysis for Feedback Control

Speaker

Wenyan Zhai

Description

A real-time signal processing unit based on FPGA has been developed for electron temperature (Te) evaluation in a Thomson scattering (TS) diagnostic system. The FPGA module is independent of the polychromator and is integrated with ADC and DAC components as a compact real-time processing unit. It receives five analog input channels directly from the spectral outputs of the polychromator and digitizes scattered signal pulses (~40 ns width) using a 16-bit, 1 GS/s ADC.
After background subtraction, each channel’s waveform is integrated, consuming 1.01 μs in simulation. The resulting integrals are then standardized across the five channels, a process taking 4.26 μs. These standardized values are matched against a precomputed 5001×5 spectral response database using a minimum-variance search algorithm. The database lookup takes 12.4605 μs in simulation, yielding the Te estimate. A 16-bit DAC converts the result to a 0–10 V analog voltage, linearly corresponding to 1–5000 eV. Preliminary validation has been performed for Te; the electron density (ne) algorithm is under development. The system demonstrates sub-15 μs processing latency and provides a viable foundation for future real-time plasma diagnostics and control applications.

Speaker's email address zhaiwenyan@swip.ac.cn
Speaker's Affiliation Southwestern Institute of Physics
Member State or International Organizations China

Author

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