多丝室在北京试验束中的应用
Application of multiwire proportional chamber in BEPC test beam
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摘要: 介绍了北京正负电子对撞机直线加速器附设e，p试验束多丝室的结构及工作机理。该室间隙6 mm，窗口面积80 mm×80 mm，位置灵敏面积50 mm×50 mm；阳极丝和阴极丝分别采用直径为20 mm和50 mm镀金钨丝，阳极丝距2 mm，阴极丝距0.7 mm,每6根阴极丝并联构成阴极条，阴极条间距4.2 mm。采用阴极条感应重心读出分辨位置，对5.9 keV的γ光子，获得优于0.3 mm (FWHM)的位置分辨;对1.1 GeV电子束流，获得0.224 mm (FWHM)的位置分辨。Abstract: This paper describes a Multiwire Proportional Chamber (MWPC) for the Test Beam on BEPC(Beijing Electron Positron Colider). The distance between the anode surface and the cathode surface of the MWPC is 6 mm. Both surfaces are made of gold-plated tungsten wires, the anode wires are 20 μm in diameter and 2 mm apart, and the cathode wires are 50 μm indiameter and 0.7 mm apart. Six adjacent wires are connected together to form a 4.2 mm wide cathode strip. The MWPC can localize the particles of e, π by cathode-induced charge centre-of-gravity read-out. For 5.9 keV γ photon, the positional resolution is less than 0.3 mm (FWHM) and for 1.1 GeV beam electron, 0.224 mm (FWHM) positional resolution is attained.
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