Neutron Emission Spectroscopy for Magnetic Confinement Experiments
The purpose of neutron diagnostics (ND) for magnetically confined plasmas of extended volumes, such as those of tokamaks, is to measure the flux and the energy distribution (spectrum) of the neutron emission for a representative selection of volume elements. ND should determine the total and local neutron yield rates of the plasma, Yn(t) and yn(x,y), as well as provide information for the deduction of the velocity distribution of the ions responsible for yn(x,y). Unfortunately, local ND measurements are impossible so three surrogates are used, namely, (i) calibrated flux measurements for information on Yn; (ii) collimated flux measurements for yn(x,y) and Yn(t); (iii) spectral measurements2 of collimated fluxes for information on the fuel ionic state of the plasma as well as on fast ions of other species besides collective ion motion (rotation).
KeywordsAnisotropy Deuterium Emissivity Tritium Tray
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