A 2-mm Wave Digital Interferometer for Tokamak Discharges in the Upgraded DIVA

Autor:	Koki Takahashi, Akimasa Funahashi, Akira Nagashima, T. Kawakami, Teruaki Shoji
Rok vydání:	1978
Předmět:	Physics Electron density Signal processing Tokamak Physics and Astronomy (miscellaneous) business.industry General Engineering Measure (physics) General Physics and Astronomy Plasma law.invention Interferometry Optics law Plasma diagnostics business Frequency modulation
Zdroj:	Japanese Journal of Applied Physics. 17:1263-1270
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.17.1263
Popis:	A 2-mm wave digital interferometer without source frequency modulation was fabricated to measure the central electron density of tokamak discharges in an upgraded DIVA device. Two methods of processing the interferometic fringe signals were presented: one by using an up/down counter and the other by a computer to obtain direct graphic displays of the complicated time-evolutions of the average electron density. These methods were successfully put into operation with sufficient resolutions of a 1/2 fringe by the counter and a 1/40 fringe by the computer, and the utility of the digital interferometer was fairly evident in practical measurements. The central average density was found to reach 4.2×1013 cm-3 in the upgraded DIVA plasmas by using the present digital interferometer.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0759c4185a1914703a92b73be8de583d https://doi.org/10.1143/jjap.17.1263 Zobrazit plný text záznamu