Thomson scattering system on the TEXTOR tokamak using a multi-pass laser beam configuration

TitleThomson scattering system on the TEXTOR tokamak using a multi-pass laser beam configuration
Publication TypeJournal Article
Year of Publication2009
AuthorsM.Y Kantor, A.JH Donne, R. Jaspers, H.J van der Meiden
JournalPlasma Physics and Controlled Fusion
Date PublishedMay
Type of ArticleArticle
ISBN Number0741-3335
Accession NumberISI:000265584300002

The main challenge for the Thomson scattering (TS) diagnostic on the TEXTOR tokamak is the detailed study of fast plasma events at a high spatial resolution and a high repetition rate of the measurements. The diagnostic uses intra-cavity probing of the plasma with a repetitively pulsed ruby laser and a fast CMOS camera as detectors. Since 2004, the TS system on TEXTOR has been gradually and systematically enhanced for the measurements of fast plasma events. For that it has recently been upgraded to obtain a multi-pass configuration. Two spherical mirrors have been installed that force the laser beam to probe the plasma a specified number of times before it is directed back into the laser medium. The diagnostics with the upgraded probing system have achieved the measurement accuracy of 3% for the electron temperature and 1.5% for the electron density at < 1 cm spatial resolution and 3 x 10(19) m(-3) plasma density and can measure at 5 kHz during an interval up to 8 ms. This makes it possible to detect, amongst others, fine structures of magnetic islands and variations of the edge pedestal in the ELMy limiter H-mode.

URL<Go to ISI>://000265584300002

Fusion Physics



Alternate TitlePlasma Phys. Control. Fusion

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