Spatial transfer function for the beam emission spectroscopy diagnostic on DIII-D
Spatial transfer function for the beam emission spectroscopy diagnostic on DIII-D
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DOI：
10.1063/1.2221908
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发表时间：
2006-09
影响因子：
1.6
通讯作者：
M. Shafer;R. Fonck;G. McKee;D. Schlossberg
中科院分区：
文献类型：
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作者：
M. Shafer;R. Fonck;G. McKee;D. Schlossberg
The spatial transfer function for the beam emission spectroscopy (BES) diagnostic is critical to quantitatively interpret local density fluctuation measurements. A three-dimensional geometrical calculation of the spatial transfer function is presented for the upgraded BES diagnostic on DIII-D to determine its spatial resolution and wave-number sensitivity. The spatial transfer function calculation for the BES system on DIII-D incorporates the high speed (f∕2) collection optics, an optical fiber bundle, neutral beam-sight line geometry, the neutral beam cross-section intensity profile, magnetic field pitch angle, as well as atomic physics of the finite atomic transition time of the collisionally excited beam atoms. The resulting imaged volumes for each BES channel typically have ∼1–2cm radial and poloidal resolutions. In addition, the viewing volume is nominally aligned along a magnetic field line to minimize spatial smearing of the field-aligned turbulent eddies. This calculation is crucial for performing...
