TJ-II:Spectroscopy: Difference between revisions

A vacuum ultraviolet spectrometer has been operated on TJ-II since 1999. It is an f/10.4 1 m normal-incidence vacuum spectrometer equipped with interchangeable 1200 and 3600 lines mm^-1 gratings and a back-illuminated CCD camera with 400 x 1340 pixels (20 x 20 μm²). The instrument covers the wavelength range from ~20 to ~300 nm. It has been used to perform spectral surveys (identify and follow the evolution of plasma impurities), to obtain impurity ion temperatures, and to perform specialized studies (e.g. study fast oxygen ions present in plasmas during the neutral beam injection heating phase.

<ref>K. J. McCarthy, B. Zurro, R. Balbín, A. Baciero, J. Herranz, and I. Pastor, Europhys. Lett. 63 (2003) 49</ref>

<ref>K. J. McCarthy, M. A. Ochando, F. Medina, B. Zurro, C. Hidalgo, M. A. Pedrosa, I. Pastor, J. Herranz and A. Baciero, Fusion Sci. & Tech. 46, 129-134 (2004)</ref>

<ref>K. J. McCarthy, V. Tribaldos, J. Arévalo, and M. Liniers, J. Physics B: Atomic, Molecular and Optical Physics 43 (2010) 144020</ref>

The TJ-II is also equipped with a multi-channel spectroscopic and compact diagnostic neutral beam injector system optimized for performing Charge Exchange Recombination Spectroscopy. It permits localized measurements of the impurity ion temperature as well as poloidal and toroidal velocity at 12 positions across the plasma minor radius. For this, the system is set-up to observe the 529.06 nm line emission of C⁺⁵.

<ref>J.M. Carmona, K.J. McCarthy, V. Tribaldos, R. Balbín, Fusion Sci. Tech. 54, 962-969 (2008)</ref>

<ref>J.M. Carmona, K.J. McCarthy, V. Tribaldos, R. Balbín, Fusion Sci. Tech. 54, 962-969 (2008)</ref>

<ref>J. M. Carmona, K. J. McCarthy, R. Balbín, S. Petrov, Rev. Sci. Instrum. 77, 10F107 (2006)</ref>