一种用于RIBLL2的纵向场多次取样型电离室
A Longitudinal Field Multiple Sampling Ionization Chamber for RIBLL2
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摘要: 为兰州第二条放射性束流线（RIBLL2）研制了一台用于ΔE测量的纵向场多次取样型电离室。 利用3组分α源（239Pu为3.435 MeV， 241Am为3.913 MeV， 244Cm为4.356 MeV）对取样单元进行了测试， 确定了电离室的最佳工作电压为－500 V， 沉积能量为3.435 MeV时， 取样单元的能量分辨为271.4 keV(FWHM)。 利用Geant4对此电离室的整体性能进行了模拟， 表明可以对Z≥4的离子实现较好的粒子鉴别。 A longitudinal field MUltiple Sampling Ionization Chamber (MUSIC)， which makes multiple measurements of energy loss for very high energy heavy ions at RIBLL2， has been constructed and tested with 3 constituent α source （239Pu: 3.435 MeV， 241Am: 3.913 MeV， 244Cm: 4.356 MeV）. The voltage plateau curve has been plotted and －500 V is determined as a proper work voltage. The energy resolution is 271.4 keV FWHM for the sampling unit when 3.435 MeV energy deposited. A Geant4 Monte Carlo simulation is made and it indicates the detector can provide unique particle identification for ions Z≥4.
Abstract: A longitudinal field MUltiple Sampling Ionization Chamber (MUSIC)， which makes multiple measurements of energy loss for very high energy heavy ions at RIBLL2， has been constructed and tested with 3 constituent α source （239Pu: 3.435 MeV， 241Am: 3.913 MeV， 244Cm: 4.356 MeV）. The voltage plateau curve has been plotted and －500 V is determined as a proper work voltage. The energy resolution is 271.4 keV FWHM for the sampling unit when 3.435 MeV energy deposited. A Geant4 Monte Carlo simulation is made and it indicates the detector can provide unique particle identification for ions Z≥4.
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