부산대학교 도서관

The Cygnus Dual Beam Radiographic Facility has been developed for support of the Subcritical Experiments (SCE) Program at the Nevada National Security Site. Some key features of the Cygnus source are; a dramatically reduced spot size (as compared to existing alternatives), layout flexibility, and reliability. Cygnus has a 2.25 MeV endpoint energy and a 50 ns radiation pulse length. The diode uses a rod pinch geometry which readily achieves a small source diameter. The majority of SCEs require an x-ray spectrum where the high energy component is maximized, and therefore use a high-Z anode rod (tungsten). Recently there has been a new requirement on the x-ray spectrum - enhancement of the low energy component. Therefore, a diode using a low-Z anode rod (titanium) has been employed. In this paper we present a comparison of Cygnus performance using both high-Z and low-Z anode rods.