TJ-II:Helium Beam
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TJ-II possesses a supersonic Helium beam diagnostic based on the line ratio method. [1] [2] [3] 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° (sector C8).
Data description
The Helium beam pulse shape is stored in the 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).
References
- ↑ B. Brañas et al., Atomic beam diagnostics for characterization of edge plasma in TJ-II stellarator, Rev. Sci. Instrum. 72, 602 (2001)
- ↑ A. Hidalgo et al., Multipulse supersonic helium beam diagnostic in the TJ-II stellarator, Rev. Sci Instrum. 75, 3478 (2004)
- ↑ F. Guzmán et al, On the determination of edge Ti profiles by a supersonic He beam in TJ-II, Journal of Nuclear Materials 390-391 (2009) 1127-1130