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19 April 2024 |
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Modelling of the NBI contribution to the neutron energy spectra for the ITER Vertical Neutron Camera | | Timofey Kormilitsyn
; Grigory Nemtsev
; Roman Rodionov
; Yury Kashchuk
; Dmitry Portnov
; | | Date: |
9 Oct 2019 | | Abstract: | The ITER Vertical Neutron Camera (VNC) is a multichannel collimator system
designed to measure the neutron emissivity profile and spectra. The energy
spectrum measurements of neutrons made by the VNC will contribute to the
reconstruction of the ion temperature, fuel ratio, and fast ion distribution
function. In this paper, the results of neutron spectra calculations for the
ITER VNC are presented. The developed software allows for the simulation of
particle spectra resulting from interaction of suprathermal ions with thermal
background plasma. The method relies on direct reaction rate calculation and
explicit fusion reaction kinematics modelling. The assessment of the D-T
neutron spectra is carried out for D-NBI heated baseline D-T ITER operation
scenarios. It is shown that neutron flux resulting from fast (beam) D with
thermal T ion interaction dominates at more than 16 MeV part of the spectra.
Thus, it is possible to assess fuel ratio based on calculated thermal-thermal
and beam-thermal neutron energy spectra. An ability to observe sawtooth-induced
mixing via VNC is studied. Lower energy boundary for the observable part of the
suprathermal ion distribution is derived. | | Source: | arXiv, 1910.3947 | | Services: | Forum | Review | PDF | Favorites | |
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