Author/Authors :
Hill، نويسنده , , Roger E and Anaya، نويسنده , , J.M and Bowles، نويسنده , , T.J and Greene، نويسنده , , G.L and Hogan، نويسنده , , G and Lamoreaux، نويسنده , , S and Marek، نويسنده , , L and Mortenson، نويسنده , , R and Morris، نويسنده , , C.L and Saunders، نويسنده , , A and Seestrom، نويسنده , , S.J and Teasdale، نويسنده , , W and Hoedl، نويسنده , , S and Liu، نويسنده , , C.-Y and Smith، نويسنده , , D.A and Young، نويسنده , , A and Filippone، نويسنده ,
Abstract :
A prototype of a solid deuterium (SD2) source of Ultra-Cold Neutrons (UCN) is currently being tested at LANSCE. The source is contained within an assembly consisting of a 4 K polyethylene moderator surrounded by a 77 K beryllium flux trap in which is embedded a spallation target. Time-of-flight measurements have been made of the cold neutron spectrum emerging directly from the flux trap assembly. A comparison is presented of these measurements with results of Monte Carlo (LAHET/MCNP) calculations of the cold neutron fluxes produced in the prototype assembly by a beam of 800 MeV protons incident on the tungsten target. A UCN detector was coupled to the assembly through a guide system with a critical velocity of 8 m/s (58Ni). The rates and time-of-flight data from this detector are compared with calculated values. Measurements of UCN production as a function of SD2 volume (thickness) are compared with predicted values. The dependence of UCN production on SD2 temperature and proton beam intensity are also presented.
