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TJ-II:Diagnostic neutral beam: Difference between revisions
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[[File:TJ-II DNBI.jpg|500px|thumb|right|Diagram of the TJ-II Diagnostic Neutral Beam Injector]] | [[File:TJ-II DNBI.jpg|500px|thumb|right|Diagram of the TJ-II Diagnostic Neutral Beam Injector]] | ||
[[TJ-II]] is equipped with a compact diagnostic neutral beam injector, designed for performing spatially resolved Charge-exchange Recombination Spectroscopy (CXRS) and Motional Stark Effect (MSE) measurements. It is located in [[TJ-II:Sectors|sector]] A7 and it is employed to obtain either measure radial profiles of impurity ion (carbon) temperature and velocity (CXRS) or to measure the wavelength separation of the Stark splitting of beam hydrogen atom emissions at 656.3 nm . | [[TJ-II]] is equipped with a compact diagnostic neutral beam injector, designed for performing spatially resolved Charge-exchange Recombination Spectroscopy (CXRS) and Motional Stark Effect (MSE) measurements. It is located in [[TJ-II:Sectors|sector]] A7 and it is employed to obtain either measure radial profiles of impurity ion (carbon) temperature and velocity (CXRS) or to measure the wavelength separation of the Stark splitting of beam hydrogen atom emissions at 656.3 nm (these emissions are Doppler shifted in wavelength to about 660 nm). | ||
<ref>K.J. McCarthy et al, ''Diagnostic neutral beam injector and associated diagnostic systems for the TJ-II stellarator device'', [[doi:10.1063/1.1784512|Rev. Sci. Instrum. '''75''', 3499 (2004)]]</ref> | <ref>K.J. McCarthy et al, ''Diagnostic neutral beam injector and associated diagnostic systems for the TJ-II stellarator device'', [[doi:10.1063/1.1784512|Rev. Sci. Instrum. '''75''', 3499 (2004)]]</ref> | ||
The injector, an upgraded DINA-5 model, is supported on a mobile cradle that permits its path through the plasma to be varied by ±3° poloidally. In parallel, a dedicated bidirectional (two vertical opposing views plus a single toroidal view) multichannel spectroscopic diagnostic, incorporating fiber arrays, an f/1.8 spectrograph, and a back-illuminated charge-coupled device, is installed to obtain Doppler line shifts and widths (around 529.2 nm) with ~1 cm spatial resolution for CXRS. | The injector, an upgraded DINA-5 model, is supported on a mobile cradle that permits its path through the plasma to be varied by ±3° poloidally. In parallel, a dedicated bidirectional (two vertical opposing views plus a single toroidal view) multichannel spectroscopic diagnostic, incorporating fiber arrays, an f/1.8 spectrograph, and a back-illuminated charge-coupled device, is installed to obtain Doppler line shifts and widths (around 529.2 nm) with ~1 cm spatial resolution for CXRS. | ||