Comparison of two multipass configurations for scattered light amplification

Monteiro, Marcelo José; Machida, Munemasa; Daltrini, A. M.; Berni, L. A.

doi:10.1590/s0103-97332001000300025

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2005

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“…The calibration of the Thomson scattering diagnostic for density measurements was performed using nitrogen Rayleigh scattering. 24) Typical Rayleigh scattering and monitor signal are shown in Fig. 10.…”

Section: Resultsmentioning

confidence: 99%

Multiposition Multipass Thomson Scattering Diagnostic for Tokamak NOVA-UNICAMP

Monteiro¹,

Machida

2005

Jpn. J. Appl. Phys.

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In this article, the use of an 8×8-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 5×1012 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.

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Section: Resultsmentioning

confidence: 99%