摘要
描述了一种用于兰州放射性束流线粒子鉴别的阳极分别在x ,y方向分条共阴极纵向场双叠层电离室 .对其性能进行初步测试 ,得到了坪曲线和能量分辨 .在 1 0kPa的P1 0工作气体 (1 0 %CH4+ 90 %Ar)时 ,阴极电压为 -650V ,阳极电压为+ 1 2 0V是较佳的工作点 .当工作气压为 2 5kPa时 ,阴极电压为 -1 650V ,阳极电压为 + 2 4 0V的工作条件较好 ,此时 ,对2 39Puα源相对能量分辨约为 4 .7% .
A longitudinal field twin-fold ionization chamber (607mm×490mm×144mm) with an active area 410mm×100mm for particle identification at the Radioactive Ion Beam Line in Lanzhou (RIBLL) was described. It has a configuration of one common cathode and double position sensitive anodes with grounding Frish grids. The entrance and exit windows as well as cathode and anodes were all made of 4μm thick mylar foils. The cathode was coated with 1.5μm silver on both sides and the anodes were deposited with 13 and 3 silver strips (31.5mm width and 0.5mm interstrip gap) in vertical and horizontal directions respectively. The plateau curves of the pulse height dependence on the cathode and anode voltages and the energy resolution Δ E/E for a working gas P10(10%CH 4+90%Ar) were measured with an α source. In the case of gas pressure 250 mbar, cathode voltage-1600V and anode voltage 220V, an energy resolution of 4.7% was achieved.
出处
《高能物理与核物理》
CSCD
北大核心
2000年第9期858-863,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金!( 1 973 50 1 0
1 96750 55)
国家杰出青年基金!( 1 982 51 1 5)资助&&
关键词
粒子鉴别
坪曲线
RIBLL
气体电离室
particle identification, anode striped twin-fold IC, plateau curve
