Self-regulating characteristics of cold neutron source with annular cylindrical moderator cell

摘要

The conditions, in which the ORPHEE type cold neutron source with an annular cylinderical moderator cell could have a self-regulating characteristics, were obtained through thermodynamic considerations. From a view point of engineering it is not easy to establish these conditions because three parameters are involved even in an idealized system without the effect of the mass transfer resistance in the moderator transfer tube between the condenser and the moderator cell. The inner shell of the ORPHEE moderator cell is open in the bottom, but it is expected that only hydrogen vapor is contained in the inner shell and liquid hydrogen in the outer shell.