High dispersion spectrometer for time resolved Doppler measurements of impurity lines emitted during ISTTOK tokamak discharges

Autor:	C.A.F. Varandas, R. B. Gomes, J. A. C. Cabral, Elena A. Sokolova, S. D. A. Reyes Cortes
Rok vydání:	2003
Předmět:	Tokamak Materials science Spectrometer business.industry law.invention symbols.namesake Optics law Dispersion (optics) symbols Plasma diagnostics business Instrumentation Doppler effect ISTTOK Doppler broadening Monochromator
Zdroj:	Review of Scientific Instruments. 74:2071-2074
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1537039
Popis:	A high dispersion, multichannel, visible spectrometer has been developed for the ISTTOK tokamak, aiming at measuring the evolution of both the edge ion temperature and plasma poloidal velocity, by analysis of a CIII spectral line. It is based on a double monochromator configuration with two high ruling densities (2700 l/mm) and 1 m focal length concave diffraction gratings, a commercial double microchannel plate image intensifier, a fast (f/#=1) relay lens built with two high diameter condensers in a back-to-back configuration, and a 2048 element photodiode charge coupled device optical multichannel analyzer. Laboratory tests have shown that a high dispersion has been achieved (≈1.65 A/mm), while keeping good temporal resolution (5 ms). Typical values measured for ion temperature (from Doppler broadening) were Ti≅25 eV while for poloidal velocity (from Doppler shift) vθ≅6 km/s.
Databáze:	OpenAIRE
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