【摘要】 本文描述了北京谱仪BES主漂移室一个多层多单元模型的结构,给出在日本KEK 12 GeV质子同步加速器K 2试验束上,利用动量0.5～1.5 GeV/c的e~+,π~+和p束测量模型性能的主要结果.在3.1 cm的单元半宽内,室的单丝空间分辨率σ_x=170～210μm.相当四十次dE/dx取样的能量分辨率σ_EE/E约为15％,提供了北京谱仪工作能区鉴别粒子的一种有效方法,可同飞行时间(TOF)计数器和簇射计数器相互补充.更多还原

【Abstract】 The prototype with cell and layer design of BES main drift chamber has been built andtests of the prototype on K2 Test Beam of KEK Proton Synchrotron have been made with 0.5¹.5 GeV/c e⁺,π⁺,and p beams.The spatial resolution for single wire of σ_?=170～210 μmhas been obtained within cell half width of 3.1 cm.The energy resolution σ_E/E correspondingto 40dE/dx samplings of 1 cm is about 15%.更多还原