Yu Y, Wang H J, Chen Z, Chen R, Lan T, Li Y Y, Zang Q, Zhang J, Zhao H L, Mao S F, Lyu B, Ye M Y, Wan B N
School of Physics, University of Science and Technology of China, Hefei 230026, China.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
Rev Sci Instrum. 2018 Jul;89(7):073503. doi: 10.1063/1.5028205.
Neutral beam attenuation is simulated by means of consulting the ADAS (Atomic Data and Analysis Structure) database based on experimentally diagnosed radial plasma density and electron temperature profiles on the Experimental Advanced Superconducting Tokamak (EAST). Two-dimensional distributions of beam emission and charge exchange recombination photon flux are simulated, taking neutral beam attenuation into account, together with comparison with experimental results of Beam Emission Spectroscopy (BES) and Charge eXchange Recombination Spectroscopy (CXRS). A photon number which is over 10 promises a sufficient photon flux for typical detectors of BES, CXRS, and UltraFast-CXRS (UF-CXRS) diagnostics. Evidence shows that the ADAS database overvalues neutral beam injection effective stopping coefficient on the EAST tokamak. The joint diagnostic of BES and UF-CXRS which is under development to measure plasma pressure with a high temporal resolution of 1 μs will have strong signals in a radial range of 0.6 < ρ < 0.8. The steep gradients of plasma density and C density at ρ ∼ 1 bring great difficulty to edge plasma investigation by this joint diagnostic.
