Calculation of spatial response of 2D beam emission spectroscopy diagnostic on MAST

Ghim(Kim), Young-chul; Field, A. R.; Zoletnik, S.; Dunai, D.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D713
Academic Journal
The beam emission spectroscopy (BES) turbulence diagnostic on MAST is to be upgraded in June 2010 from a one-dimensional trial system to a two-dimensional imaging system (8 radial×4 poloidal channels) based on a newly developed avalanche photodiode array camera. The spatial resolution of the new system is calculated in terms of the point spread function to account for the effects of field-line curvature, observation geometry, the finite lifetime of the excited state of the beam atoms, and beam attenuation and divergence. It is found that the radial spatial resolution is ∼2-3 cm and the poloidal spatial resolution ∼1-5 cm depending on the radial viewing location. The absolute number of detected photons is also calculated, hence the photon noise level can be determined.


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