Calculation of spatial response of 2D BES diagnostic on MAST

Details Calculation of spatial response of 2D BES diagnostic on MAST Calculation of spatial response of 2D BES diagnostic on MAST

2012-03-23

arxiv.org/abs/1203.5282v1

Rev. Sci. Instrum. 81, 10D713 (2010)

Physics

Plasma Physics

3 pages, 4 figures

Scientific paper

The Beam Emission Spectroscopy (BES) turbulence diagnostic on MAST is to be upgraded in June 2010 from a 1D trial system to a 2D imaging system (8 radial \times 4 poloidal channels) based on a newly developed APD array camera. The spatial resolution of the new system is calculated in terms of the point spread function (PSF) 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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