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Diamagnetic measurements based on the compensation of TF current diffusion in J-TEXT.
Review of Scientific Instruments 2016 November
Due to the existence both of toroidal ripples and toroidal field (TF) current diffusion, the toroidal flux changes with time when the TF current is at the flat-top. A diamagnetic measurement based on the compensation of TF current diffusion has been built in J-TEXT to solve this problem. The measurement system includes a double-loop installed in the vacuum vessel and an array of small printed circuit board (PCB) magnetic probes placed on the mid-plane of one TF coil. A model was proposed to analyze and compensate the effect of TF current diffusion. Experiment results show that the residual flux is about 1 × 10-4 Wb after the compensation and it can meet the need of diamagnetic measurement in J-TEXT.
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