A novel Real-Time High Bandwidth Phasemeter (RHBP) system
has been developed for far-infrared laser interferometer in HL-2A
tokamak. To meet the requirement of high-precision electron density
fluctuation diagnostics, the system is based on the FFT overlap
method, which can suppress the measurement error in high-bandwidth
mode. The system consists of four Real-time Signal Conditioning
(RSC) Modules and four RHBP Modules for high spatial resolution.
Benefiting from the field-programmable gate array (FPGA) platform,
the proposed method can be implemented with low noise and low
cost. Experimental results suggest that the density resolution is
1.79× 1015/m-3 in high-bandwidth mode, which
indicates that the proposed RHBP system achieves high performance
for high-frequency fluctuation measurement.
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