A digital long pulse integrator for EAST Tokamak |
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| Affiliation: | 1. Civil and Environmental Engineering Department, University of Windsor, Windsor, ON, Canada;2. Civil Engineering Department, Ryerson University, 350 Victoria, Toronto, ON, Canada;1. University of Science and Technology of China, Hefei, China;2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China;3. General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;1. National Fusion Research Institute, 169-148 Gwahak-ro, yuseong-gu, Daejeon, Republic of Korea;2. General Atomics, San Diego, CA, USA;3. Princeton Plasma Physics Laboratory, Princeton, NJ, USA;4. University of Science and Technology, Daejeon, Republic of Korea;1. EURATOM – ENEA – CNR Fusion Association, CNR-IFP, via R. Cozzi 53, 20125 Milan, Italy;2. EURATOM – ENEA – CNR Fusion Association, Frascati Research Center, Division of Fusion Physics, Rome, Frascati, Italy |
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| Abstract: | A digital integrator has been developed to be compatible with the long pulse plasma discharges on the Experimental Advanced Superconductor Tokamak (EAST), in which the induced signal is modulated by a chopper, and a field programmable gate array (FPGA) in the 16-bit digitizer is used to realize the digital integration in real time. After rectification and integration, the drift is almost linear and stable in controlled temperature, so a period of 50 s is used to determine the linear drift rate for drift compensation. The integration data can be directly transferred to the reflective memory (RFM) card, which is installed in the same PCI eXtensions for Instrumentation (PXI) chassis, so the data transmission can be also done in real time. The test results show that the real time data transmission rate is up to 10 kHz, the integration drift is typically less than 0.4 uVs/s and drift performance is a little worse in real long pulse discharge, which can be reduced further by using more precise data acquisition. |
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| Keywords: | Digital integrator Long pulse Drift Chopper Real time |
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