title: Development of a cold-neutron imaging detector based on thick gaseous electron multiplier.
abstract: We present the results of our recent studies on a cold-neutron imaging detector prototype based on THick Gaseous Electron Multiplier (THGEM). The detector consists of a thin Boron layer, for neutron-to-charged particle conversion, coupled to two THGEM electrodes in cascade for charge amplification and a position-sensitive charge-readout anode. The detector operates in Ne∕(5%)CF4, at atmospheric pressure, in a stable condition at a gain of around 10(4). Due to the geometrical structure of the detector elements (THGEM geometry and charge read-out anode), the image of detector active area shows a large inhomogeneity, corrected using a dedicated flat-filed correction algorithm. The prototype provides a detection efficiency of 5% and an effective spatial resolution of the order of 1.3 mm.
authors: Paul Scherrer Institut (PSI), Villigen PSI CH-5234, Switzerland.
authors: M
authors: M
authors: Cortesi
authors: R
authors: R
authors: Zboray
authors: A
authors: A
authors: Kaestner
authors: H-M
authors: HM
authors: Prasser