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P: Fachverband Plasmaphysik
P 9: Helmholtz Graduate School 2 and Magnetic confinement 2
P 9.4: Vortrag
Dienstag, 10. März 2020, 15:20–15:45, b305
Quantitative investigation of the neutron production in ASDEX Upgrade — •Monika Koleva1,2, Giovanni Tardini1, Hartmut Zohm1, and The ASDEX Upgrade Team1 — 1Max-Planck-Institute for Plasma Physics, Garching bei München, Germany — 2LMU, München, Germany
A detailed ASDEX Upgrade geometry has been implemented in the MonteCarlo neutron transport code Serpent, the reference for a new absolute calibration of the neutron counters. The code allows the description of 3D geometries imported from CAD.
The experimental technique consists of a toy train carrying a radioactive source at two radial positions inside the tokamak vessel on the equatorial plane, allowing a long calibration time.
The current simulation scenario uses a neutron point source and looks at the output of the Helium-3 neutron detector. This is a prior step to including a radioactive source with an energy distribution and aims to test as well the detector response. The energy of the source has been varied between 0.025 eV and 4 MeV. A convergence assessment with respect to the total number of neutrons run is shown, ranging from 10E4 to 10E7. Taking vessel components but no moderation into account the detector already calculates about 1 n/s which is close to the experimental result. Further clarification is still in progress. The next step is providing a moderator and simulating also the BF3 and scintillation detectors at ASDEX Upgrade.
In addition, preliminary results of the discrepancies between the experimental neutron rate and the one predicted by TRANSP are shown.