【摘要】 本文描述了为兰州放射性离子束流线(RIBLL)研制的一种高性能平行板雪崩计数器(PPAC)。它由中心阳极和X、Y位置阴极构成,阳极—阴极间距3mm。阳极为1.5 mm 厚Mylar膜,双面镀金。阴极为f25mm 镀金钨丝,丝距1mm,位置读出采用电荷分除法。工作气体异丁烷。当工作气压为700 Pa,阳极电压为500 V时,对3组分a粒子位置分辨 0.76 mm(FWHM),探测效率约99.1%。更多还原

【Abstract】 A two-dimensional positional sensitive parallel-plate avalanche detector (PPAC) with 100mm?00mm active area has been developed for RIBLL. The detector consists of one anode and two cathodes. Each cathode position signal is readout with a resistance chain. The PPAC was tested at 700 Pa of flowing isobutane and +500 V at the anode, and an intrinsic position resolution of 0.76 mm (FWHM) was determined.更多还原