Development of a compact magnetic proton recoil spectrometer for measurement of deuterium-tritium neutrons. 
A new compact magnetic proton recoil (MPR) neutron spectrometer has been designed for precise measurement of deuterium-tritium (DT) neutrons.  This design is presented emphasizing the magnetic analyzing system, which is based on a compact quadrupole-dipole (QD) electromagnet.  The focal plane detector (FPD) is also discussed with respect to application for the next step.  The characteristics of the MPR spectrometer were calculated by using Monte Carlo simulation.  A preliminary experiment was performed to test the magnetic analyzing system and the proton images of the FPD.  Since the QD electromagnet design allows for a larger foil thickness and solid angle to be utilized, the MPR spectrometer defined in this paper can achieve neutron detection efficiency more than 5 × 10(-7) at an energy resolution of 1.5% for measuring DT neutrons.