Speakers
Description
This work presents performance and characteristics for detectors based on developed in NRC «Kurchatov Institute – IHEP» photomultipliers with distant photocathode (FEU-KS) and polystyrene-based scintillators with 0.5 – 1 mm thickness and up to 200 mm width.
Photomultiplier FEU-KS is a tubular glass envelope 40 mm diameter and be-alkaline photocathode 15200 mm2 size, 200 mm length dynodes and one or two anodes (length 200 mm or 100 mm respectively). The length of the detector is limited by light attenuation length in scintillator and is about 300 mm in our case. The typical light output of the detector is about 150 ph.e./MeV that provides efficiency of registration of charged particles more than 98%. The detector of this type provide a high ratio of suppression of the gamma-quants counting rate. For the energy in area 1 MeV this ratio of e/γ counts is not worth than 104. The maximum counting-rate in the detector is not less than 107 pulses/s.
These detectors are using in the experiments «OKA» and «GIPERON» on the IHEP proton synchrotron U-70 in order to significantly reduce the scattering of beam particles. The set measurements for low energies was done also and it shows the efficiency of such type detectors for identification of charged low-energy particles, for example, in the control systems for radiation beta pollution
