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Type: Artigo de periódico
Title: Multiposition multipass Thomson scattering diagnostic for tokamak NOVA-UNICAMP
Author: Monteiro, MJR
Machida, M
Abstract: In this article, the use of an 8 x 8-matrix independent 10-stage dynode multichannel photomultiplier for multipass Thomson scattering is described. Light from a pulsed ruby laser is irradiated 12 times in the central region of plasma using the resonator cavity of a multipass system, and integrated scattered light is detected for the first time using the multichannel photomultiplier XP1752 from Philips. The simultaneous measurements of electron temperature and density at four spatial positions, which can be extended by increasing the numbers of Analog-to-Digital Converter (ADC) channels and signal output windows, have been performed throughout full discharge by a shot-to-shot procedure. An electron temperature T(e) of 50 eV and a density n(e) of 5 x 10(12) cm(-3) were. measured for the tokamak, NOVA-UNICAMP. Because of the use of a low-power ruby laser (typically 1 J) and scattered light amplification using a multipass system, the level of stray light was kept low and absolute density measurements were made possible by nitrogen Rayleigh scattering.
Subject: multichannel detector
Thomson scattering
Rayleigh scattering
multipass systems
electronic temperature and density
Country: Japão
Editor: Japan Soc Applied Physics
Rights: fechado
Identifier DOI: 10.1143/JJAP.44.383
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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