Discrepancy between estimated and measured fusion product rates on MAST using guiding-centre approximation

Discrepancy between estimated and measured fusion product rates on MAST using guiding-centre approximation

Discrepancy between estimated and measured fusion product rates on MAST using guiding-centre approximation 150 150 Mathew
UKAEA-CCFE-PR(18)40

Discrepancy between estimated and measured fusion product rates on MAST using guiding-centre approximation

Experimental evidence is presented of a discrepancy between the predicted and measured D-D fusion products rates on MAST. Both the neutron and proton production rates, measured independently with a neutron camera and charged fusion product detector array, are approximately 40 % lower than those predicted by TRANSP/NUBEAM codes. This deficit is scenario independent and can not be explained by uncertainties in the typical plasma parameters suspected for such discrepancies such as the electron temperature, the plasma effective charge and the injected neutral beam power. Instead, a possible explanation is an overestimate of the neutron emissivity due to the guiding center approximation used in NUBEAM to model the fast ion orbits.

Collection:
Journals
Journal:
Nuclear Fusion
Publisher:
IOP
Published date:
19/11/2018