Experimental demonstration of the plasma electron density diagnostics using the single-shot THz detection method. (27th October 2020)

• Record Type: Journal Article
• Authors: Kang, Keekon; Lee, Sihyeon; Jang, Dogeun; Kim, Jinju; Suk, Hyyong
• Is Part Of: Plasma physics and controlled fusion. Volume 62:Number 12(2020)
• Publication Date: 2020-10-27
• Subjects: plasma diagnostics -- terahertz -- inductively-coupled plasma -- laser-plasma; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/abbf09
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: We report the first experimental demonstration of a novel plasma diagnostics method using the single-shot THz detection method. In this experiment, a broadband single THz pulse is generated by focusing two-color (400 nm and 800 nm in wavelength) laser pulses in air and the THz pulse is sent through an inductively-coupled plasma with a density of 10 13 –10 14 cm −3 which is in the modern tokamak plasma density range. Phase shift of the THz pulse is measured by the single-shot THz detection method and the instant plasma density information is obtained from the phase shift. The result is compared with that of the existing THz time domain spectroscopy method and it is found that both results are in good agreement. It implies that the proposed method in this paper can provide a new plasma diagnostics tool which can be used for dynamically changing plasmas.