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  • IF =1.193

  • ISSN 1009-0630

  • e-ISSN 2058-6272

  • CN 34-1187/TL

Content of The 4th Workshop on Plasma Diagnostics in our journal
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Design and development of a synchronized operation control system for Thomson scattering diagnostic on J-TEXT
Jingjun ZHOU (周靖钧), Li GAO (高丽), Yinan ZHOU (周乙楠), et al.
Plasma Sci. Technol.    2018, 20(8): 084001; doi: 10.1088/2058-6272/aabd73
Abstract93)      PDF (1467KB)(309)      

A Thomson scattering diagnostic system is under construction at the Joint Texas Experimental Tokamak (J-TEXT). A 1064 nm Nd:YAG laser with 50 Hz repetition rate is used as the laser source. We have used a software for careful and precise control of the laser through serial communication. A time sequence operating system has been developed to synchronize the laser control and data acquisition system with the central control system (CSS). The system operates commands from the CSS of J-TEXT and generates triggers for the laser and data acquisition system in the proper sequence. It also measures an asynchronous time value that is needed for accurate time stamping. All functions are served by a field-programmable gate array development platform that is suitable for high-speed data and signal processing applications. Several embedded peripherals, including Ethernet and USB 2.0, provide communication with the CSS and the server.

Measurement of impurity lines with two- crystal x-ray spectrometers on EAST
Xinshuai YANG (杨新帅) 1, Ruiji HU (胡睿佶) 2, Jun CHEN (陈俊) 2, et al.
Plasma Sci. Technol.    2018, 20(12): 124001; doi: 10.1088/2058-6272/aad177
Abstract64)      PDF (1367KB)(166)      

To simultaneously measure the He-like and H-like argon spectra, a two-crystal assembly has been deployed to replace the previous single crystal on the tangential x-ray crystal spectrometer. By selecting appropriate crystals with similar Bragg angles, plasma temperature in the range of 0.5 keV ≦ Te ≦ 10 keV and rotation can be diagnosed based on the He-like and H-like argon spectra. However, due to the added complexity in the two-crystal assembly in which the spectra might be diffracted by two crystals, some additional impurity lines were identified. For example, tungsten (W) lines in different ionization states were diffracted by the He-like and H-like crystal. Additional molybdenum (Mo) lines in the wavelength range of He-like and H-like argon spectra lines were also summarized. The existence of these additional lines caused the fitted temperature to be different from the true values. This paper presents the identified lines through a comparison with available database, which should be included in the fitting procedure.