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Design of FPGA based high-speed data acquisition and real-time data processing system on J-TEXT tokamak

Affiliation:	1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. School 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. Institute of Plasma Physics AS CR, Za Slovankou 3, 182 00 Praha 8, Czech Republic;2. Department of Physical Electronics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 180 00 Praha 8, Czech Republic;3. Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom;4. Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8, Czech Republic;5. Faculty of Electrical Engineering, Czech Technical University in Prague, Karlovo náměstí 13/E, Prague, Czech Republic;1. Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti 4, Padova 35127, Italy;2. Massachusetts Institute of Technology, 175 Albany Street, Cambridge, MA 02139, USA;1. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan;2. Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan;1. National Fusion Research Institute (NFRI), Gwahangno 169-148, Yuseong-Gu, Daejeon 305-806, Republic of Korea;2. Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa, P-1049-001 Lisboa, Portugal

Abstract:	Tokamak experiment requires high-speed data acquisition and processing systems. In traditional data acquisition system, the sampling rate, channel numbers and processing speed are limited by bus throughput and CPU speed. This paper presents a data acquisition and processing system based on FPGA. The data can be processed in real-time before it is passed to the CPU. It provides processing ability for more channels with higher sampling rates than the traditional data acquisition system while ensuring deterministic real-time performance. A working prototype is developed for the newly built polarimeter–interferometer diagnostic system on the Joint Texas Experimental Tokamak (J-TEXT). It provides 16 channels with 120 MHz maximum sampling rate and 16 bit resolution. The onboard FPGA is able to calculate the plasma electron density and Faraday rotation angel. A RAID 5 storage device is adopted providing 700 MB/s read–write speed to buffer the data to the hard disk continuously for better performance.

Keywords:	Tokamak Data acquisition FPGA Data processing Polarimeter–interferometer diagnostic
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