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

Young Chul Ghim, A. R. Field, S. Zoletnik, D. Dunai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number10D713
JournalReview of Scientific Instruments
Volume81
Issue number10
DOIs
Publication statusPublished - Oct 1 2010

ASJC Scopus subject areas

  • Instrumentation

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