Chinese Physics C > 2000, Vol. 24 > Issue(9): 858-863

Gas Ionization Chamber for Particle Identification at RIBLL

Institute of Modem Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

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Abstract：
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 ΔE/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.

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CHEN ZhiQiang, WANG Meng, ZHAN WenLong, GUO ZhongYan, XIAO GuoQing, WANG JinChuan, WANG QuanJin, NING ZhenJiang, LI JiaXing, WANG JianFeng, ZHENG Rui and DONG XiaoNan. Gas Ionization Chamber for Particle Identification at RIBLL[J]. Chinese Physics C, 2000, 24(9): 858-863.

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Received: 1999-08-04
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Gas Ionization Chamber for Particle Identification at RIBLL

Corresponding author:CHEN ZhiQiang,

Institute of Modem Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Received Date:1999-08-04

Accepted Date:1900-01-01

Available Online:2000-09-05

Abstract: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 ΔE/E for a working gas P10(10%CH₄+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.

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Gas Ionization Chamber for Particle Identification at RIBLL

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