Development of a Chopper Spectrometer with a Pulse-shaping Chopper at a Pulsed Source

Abstract

We have developed a chopper spectrometer with a pulse-shaping chopper at a pulsed source. In this new type of a spectrometer, tunable and symmetric resolution function can be obtained by shaping the source pulse using an additional chopper (pulse shaping chopper), while keeping high peak intensity of the source. In the course of the development, we investigated and developed design criterions, related devices and other technical and theoretical issues required to realize a double chopper spectrometer. The spectrometer, named AMATERAS, has been finally constructed at Materials & Life Science Experimental Facility at J-PARC, and is producing scientific outputs under J-PARC user program now.