A large, high performance, curved 2D position-sensitive neutron detector

A new position-sensitive neutron detector has been designed and constructed for a protein crystallography station at LANL's pulsed neutron source. This station will be one of the most advanced instruments at a major neutron user facility for protein crystallography, fiber and membrane diffraction. The detector, based on neutron absorption in (3)He, has a large sensitive area of 3000 cm 2, angular coverage of 120degrees, timing resolution of 1 mus, rate capability in excess of 10(6) s(-1), position resolution of about 1.5 mm FWHM, and efficiency > 50% for neutrons of interest in the range 1-10 Angstrom. Features that are key to these remarkable specifications are the utilization of eight independently operating segments within a single gas volume, fabrication of the detector vessel and internal segments with a radius of curvature of about 70 cm, optimized position readout based on charge division and signal shaping with gated baseline restoration, and engineering design with high-strength aluminum alloy. (C) 2002 Elsevier Science B.V. All rights reserved.