Development of a data acquisition system for a multiple -ray detection method

Kimura, Atsushi   ; Toh, Yosuke   ; Koizumi, Mitsuo ; Osa, Akihiko  ; Oshima, Masumi; Goto, Jun; Igashira, Masayuki*

The aim of our study is the acquisition of neutron cross-section data for the minor actinides (such as Np, Am and Am). We develop a new advanced measurement technology for the acquirement of neutron cross-section data of the minor actinides. In this technology, we construct a 4 Ge-spectrometer which consists of 30 Ge crystals and BGO anti-Compton shields. Normally, a data acquisition system for such a big Ge spectrometer consists of many NIM modules; it requires large space; in addition, its cost of this system becomes huge. To overcome these problem, we developed a new data acquisition system for the 4 Ge-spectrometer with digital signal processing (DSP) techniques. This system consists of three Main ADC modules, which measure the energy of gamma rays with DSP technique, five Fast Timing modules and a Coincidence module to detect a coincidence condition and to measure timing data. All modules can be mounted a 19 inches VME sub-rack, the cost of this system is less than 2000 dollars per one Ge detector channel.