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TJ-II:Helium Beam: Difference between revisions
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(Hamamatsu, model R5900U-20-L16) with interference filters | (Hamamatsu, model R5900U-20-L16) with interference filters | ||
(FWHM = 1 nm). | (FWHM = 1 nm). | ||
<ref> | <ref>B. Brañas et al., ''Atomic beam diagnostics for characterization of edge plasma in TJ-II stellarator'', [[doi:10.1063/1.1319868|Rev. Sci. Instrum. '''72''', 602 (2001)]]</ref> | ||
A Collisional Radiative (CR) model for the line emission intensity ratios is used | A Collisional Radiative (CR) model for the line emission intensity ratios is used | ||
to deduce electron densities and temperatures. | to deduce electron densities and temperatures. | ||
<ref> | <ref name="Hidalgo">A. Hidalgo et al., ''Multipulse supersonic helium beam diagnostic in the TJ-II stellarator'', [[doi:10.1063/1.1779617|Rev. Sci Instrum. '''75''', 3478 (2004)]]</ref> | ||
<ref name="Guzman"> | <ref name="Guzman">F. Guzmán et al, ''On the determination of edge Ti profiles by a supersonic He beam in TJ-II'', [[doi:10.1016/j.jnucmat.2009.01.290|Journal of Nuclear Materials '''390-391''' (2009) 1127-1130]]</ref> | ||
It provides profiles of the electron temperature and density in the plasma edge at a repetition rate of up to 200 Hz. | It provides profiles of the electron temperature and density in the plasma edge at a repetition rate of up to 200 Hz. | ||
It is located at φ = 355.3° ([[TJ-II:Sectors|sector]] C8). | It is located at φ = 355.3° ([[TJ-II:Sectors|sector]] C8). | ||
[[File:TJ-II_Helium_beam.png|300px|thumb|right|The TJ-II Helium beam diagnostic. The laser can be crossed with the Helium beam for LiF measurements of the excited He population <ref name=" | [[File:TJ-II_Helium_beam.png|300px|thumb|right|The TJ-II Helium beam diagnostic. The laser can be crossed with the Helium beam for LiF measurements of the excited He population <ref name="Hidalgo" /> and validation of the CR model.]] | ||
== Data description == | == Data description == | ||
The Helium beam pulse shape is stored in the [[TJ-II:Shot database|TJ-II database]] with the name 'HELIO_HAZ'. | The Helium beam pulse shape is stored in the [[TJ-II:Shot database|TJ-II database]] with the name 'HELIO_HAZ'. | ||
The detected line emission signals are stored with the names 'He_xxx_yy', where 'xxx' is the wavelength in nm (667, 706, or 728), while 'yy' is the position (from 01 through 16). | The detected line emission signals are stored with the names 'He_xxx_yy', where 'xxx' is the wavelength in nm (667, 706, or 728), while 'yy' is the position (from 01 through 16). | ||
[[File:TJ-II He beam.jpg|400px|thumb|left|Photo of | [[File:TJ-II He beam.jpg|400px|thumb|left|Photo of Helium and [[TJ-II:Lithium Beam|Lithium]] beam diagnostics (top ports)]] | ||
== References == | == References == | ||
<references /> | <references /> | ||