Abstract
A Large-area charged particle detector for highenergy physics experiments has been developed. This detector includes inorganic scintillator plates with thicknesses of 0.5 mm and wavelength-shifting fibers (WLSFs) of 0.2 mm in diameters. The size of effective area is 1 m by 1 m. The WLSFs are connected to both plate surfaces optically, and on the top and the bottom, fibers are attached along to x and y-axis direction, respectively. The best WLSF to obtain large number of photoelectrons is determined, which enables us to detect charged particles with thinner scintillation crystals. This means an improvement of position resolution of this detector. The number of photoelectrons obtained from a new type scintillation crystal, which is more reasonable than the conventional ones are also measured. We also estimated its position resolution. This detector enables us to detect charged particles with higher position resolution and lower cost than conventional scintillation detectors and gas chambers.
Highlights
When charged particles pass thorough a scintillation crystal, scintillation light is released isotropically and the light with smaller incident angle than the critical angle goes outside the crystal
The results for Y-11 (300) MJ wavelength-shifting fibers (WLSFs) are shown in Fig. 6. and Fig. 7
Considering the number of photoelectrons is doubled with both sides reading, 3 WLSF layers are enough for detecting 10 photoelectrons, which corresponds to of 99% or more detection efficiency
Summary
When charged particles pass thorough a scintillation crystal, scintillation light is released isotropically and the light with smaller incident angle than the critical angle goes outside the crystal. The emission region gets smaller as the crystal thinner. To curb this spread of the light, inorganic crystals with high densities are introduced. Wavelength-shifting fiber (WLSF) is a kind of optical fiber. We measured the number of photoelectrons with high-growth-rate La-GPS crystal. High-growth-rate scintillation crystal is a scintillator which is crystalized at the higher rate than the conventional one. It is much more reasonable than the conventional one while it contains micro bubble and is not transparent completely
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