Tomographic reconstruction of H{sub {alpha}} emissivity profiles in HANBIT magnetic mirror device
- Korea Basic Science Institute, National Fusion R and D Center, 52, Yeoeun-Dong, Yusung-Ku, 305-806 Daejeon (Korea, Republic of)
Hydrogen is the main constitute of plasmas in HANBIT magnetic mirror device, therefore, measurement of the emission from excited levels of hydrogen atoms is an important diagnostic tool. From the emissivity of H{sub {alpha}} radiation one can derive quantities such as the neutral hydrogen density and the source rate, i.e., the rate at which the plasma protons are replenished by ionization of neutral atoms diffusing into the plasma. The reconstruction of emissivity profiles from H{sub {alpha}} radiation measurement is a highly undetermined and ill-posed inversion problem, due to the restricted viewing access, number of chords and the increased noise level. An unbiased and consistent probability theory based approach within the framework of Bayesian inference is provided by the maximum entropy method which is independent of model assumptions, but allows any prior knowledge available to be incorporated. The formalism is applied to the reconstruction of H{sub {alpha}} emissivity profiles in HANBIT magnetic mirror device.
- OSTI ID:
- 20644056
- Journal Information:
- Review of Scientific Instruments, Vol. 76, Issue 1; Other Information: DOI: 10.1063/1.1831671; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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