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BEPC Ⅱ-LINAC Test Beam (test beam) is only in high-energy physics test beam device, which consists of a three beam lines of E1, E2 and E3, each beam line has a different function. E2 line second target chamber, in order to obtain different energy required for high-energy detector scale and types of single particle beam, a movable target target installed in the target chamber of the electron beam at the exit. Secondary particles produced by interaction of the electron with the target by (beryllium, carbon, aluminum, copper, tungsten) e ±, π ±, n, p, γ, and π ± decay μ ± therefore targeting generated after E2 beam The stream is a beam of high-energy hybrid particle experiments, the formation of a mixed radiation field. The radiation field, in addition to the single momentum variable charged to the E3 line single particle, but also to use its various irradiation experiments, such as material irradiation, crops induced mutation breeding, irradiation damage of the fiber link. These irradiation experiments are given absorbed dose and flux irradiation dose and flux of various particle energy segment, so that the radiation field simulation study and develop a suitable for high-energy particle mixed radiation field measurement detector test beam upgrade an urgent task. The papers around the mixed analog and mixed-radiation field radiation field measurement detector (stacked scintillator detector) developed to expand. First, the use of Monte Carlo simulation software FLUKA electron beam bombardment target target hybrid particle simulation of the energy spectrum of a variety of secondary particles in the all-round the corner, in the whole energy range of integration of the different secondary particles after angle spectrum, the double differential energy spectra of the particles in the 39-43 degree angle distribution; then, the simulation results of the radiation field, the successful design and development of a mixed radiation measurement detectors - stacked scintillator detectors and performance of research and testing, these features include: counting Ping test, the detection efficiency GEANT4 simulation, particle resolution performance test. Developed radiometric detector from cosmic ray signal PMT 500mV above, do not need any amplifier amplification can be screened and measurement, counting the wide plateau high voltage distribution (1800V-2500V), the detection efficiency to achieve the expected the design goals, the efficiency of charged particles up to more than 97%, the gamma and neutron detection efficiency in the range of 10% -40%, particle resolution performance, especially n-γ distinguish between good performance, the particles in a large energy range distinguish performance desired. Now detector was Beijing test beam target chamber a mixed radiation measurements, and study its more than two hybrid particle identification capability. Further, the use of semiconductor PIN silicon photodiode several fixed points of the target chamber dose measurement, and were compared with the simulation results. Full papers includes the following sections: Beijing Electron Positron Collider (BEPC Ⅱ) and the second target chamber of the the introduced test beam (TBF), the Monte Carlo method and FLUKA and GEANT4 simulation software, test beam E2 line mixed radiation field simulation of mixed radiation field measurement detector design and development, the mixed radiation field measurements of the test beam the E2-line second target chamber, Summary and Outlook.
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