Design and implementation of plasma electron density measurements based on FPGA with all-phase FFT for tokamak devices

doi:10.1063/5.0060372

	Design and implementation of plasma electron density measurements based on FPGA with all-phase FFT for tokamak devices
	Shu, Shuangbao 2; Lai, Jin 2; Chen, Zhiqiang 2; Wang, Yong 1; Zhang, Yuzhong 2; Tao, Xiaojie 2; Lang, Xianli 2; Chen, JingJing 2
刊名	REVIEW OF SCIENTIFIC INSTRUMENTS
	2021-09-01
卷号	92
ISSN号	0034-6748
DOI	10.1063/5.0060372
通讯作者	Zhang, Yuzhong()
英文摘要	Plasma electron density is one of the most fundamental parameters when studying tokamak plasma physics, which is widely used in plasma control systems and plasma physics analyses. A hydrogen cyanide laser interferometer is generally applied to measure the plasma electron density in many tokamak devices. Therein, the plasma electron density is calculated by measuring the phase difference between the reference signal and the detector signal. This work provides a new way to realize real-time measurements of the plasma electron density with a phase comparator and processing system based on a field-programmable gate array chip. The system integrates a signal processing module, an all-phase fast Fourier transform (ap-FFT) module realized via matrix operations and phase comparisons, and a network communication module all in one board. This work concludes that the ap-FFT is robust and accurate for phase calculations compared with a windowing FFT. A data-reuse method and a phase shift method are proposed to improve the time resolution and phase range. The phase error is less than 0.1?degrees and the time resolution is 0.025 ms, which is better than hardware methods and traditional software methods. This system is highly flexible with reduced design costs to meet the requirements of a tokamak, which can provide a valuable reference for other tokamak and phase difference comparisons.& nbsp;Published under an exclusive license by AIP Publishing.
资助项目	Fundamental Research Funds for the Central Universities[JZ2019HGTB0082] ; National Magnetic Confinement Fusion Science Program of China[2015GB102004]
WOS关键词	REAL-TIME
WOS研究方向	Instruments & Instrumentation ; Physics
语种	英语
出版者	AIP Publishing
WOS记录号	WOS:000724254200001
资助机构	Fundamental Research Funds for the Central Universities ; National Magnetic Confinement Fusion Science Program of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/126468]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhang, Yuzhong
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Hefei Univ Technol, Sch Instrument Sci & Optoelect Engn, Anhui Prov Key Lab Measuring Theory & Precis Inst, Hefei 230009, Peoples R China
推荐引用方式 GB/T 7714	Shu, Shuangbao,Lai, Jin,Chen, Zhiqiang,et al. Design and implementation of plasma electron density measurements based on FPGA with all-phase FFT for tokamak devices[J]. REVIEW OF SCIENTIFIC INSTRUMENTS,2021,92.
APA	Shu, Shuangbao.,Lai, Jin.,Chen, Zhiqiang.,Wang, Yong.,Zhang, Yuzhong.,...&Chen, JingJing.(2021).Design and implementation of plasma electron density measurements based on FPGA with all-phase FFT for tokamak devices.REVIEW OF SCIENTIFIC INSTRUMENTS,92.
MLA	Shu, Shuangbao,et al."Design and implementation of plasma electron density measurements based on FPGA with all-phase FFT for tokamak devices".REVIEW OF SCIENTIFIC INSTRUMENTS 92(2021).