Neutron Brightness Research Articles

A method for accurate measuring of yield parameters for neutron generators having complex targets

A method for accurate determination of the neutron yield or flux emitted by targets of neutron generators with complex surface configurations is presented. The method is based on the calculation of the neutron brightness distribution (number of neutrons irradiated from the unit of target surface in the unit of time) over the target, surface, by making several measurements at different points around the target. This distribution is obtained by solving an algebraic system of equations by means of the least squares method.

Long-pulse spallation source neutronic performance

There are potential gains of about a factor of seven in the time-average neutron brightness for a coupled liquid H2 moderator compared to a decoupled one, and a factor of around five for a H2 0 moderator. However, these gains come at the expense of p

Determination of the deuterium temperature profile in magnetic fusion plasmas

A new experimental method for determining the radial deuterium temperature profileTD(R) in axisymmetrical toroidal fusion plasmas is presented. The method is based on a generalized Abel inversion of neutron brightness data providing the radial neutron emissivity profile of the plasma. This profile, combined with information on the deuterium density profile, is used to determineTD(R) under the assumption that the ion velocity distribution is Maxwellian. Results are presented here from the analysis of JET data. It is found that, for typical JET plasma conditions, the dominant source of uncertainty arises from the high plasma impurity level and the fact that it is poorly known; these problems can be expected to be remedied and neutron brightness measurements would be expected to be very effective (especially in high-density plasmas) as aTD(R) diagnostics.