一种高性能多极双维位置灵敏平行板雪崩计数器(multi-plate parallel plate avalanchecounter,MPPAC)在兰州中能重离子加速器放射性次级束流线(radioactive ion beam line in lanzhou,RIBLL)上被应用,由二次雪崩带来的高增益使它很适合...一种高性能多极双维位置灵敏平行板雪崩计数器(multi-plate parallel plate avalanchecounter,MPPAC)在兰州中能重离子加速器放射性次级束流线(radioactive ion beam line in lanzhou,RIBLL)上被应用,由二次雪崩带来的高增益使它很适合探测较高能量的较轻粒子,它主要由1个中心阳极,x,y位置栅极和2个阴极组成,位置信号由x,y位置栅极采用电荷分除法读出,使用异丁烷工作气体,气压650Pa,阳极+400V,阴极-350V时,对于α粒子位置分辨为0.55mm(半高全宽度,fwhm),位置线性色散远好于±0.2mm,探测效率大于99.2％,同时,也研究了位置分辨与阳极、阴极电压的关系,与放大器成形时间常数的依赖,随工作气压变化等。展开更多
A detector setup for the measurement of angular distribution of heavy-ion elastic scattering at energies around Coulomb barrier on the radioactive ion beam line in Lanzhou at the heavy-ion research facility in Lanzhou...A detector setup for the measurement of angular distribution of heavy-ion elastic scattering at energies around Coulomb barrier on the radioactive ion beam line in Lanzhou at the heavy-ion research facility in Lanzhou is designed.The beam profile and the scattering angles on the target are deduced by two parallel plate avalanche counters,and four sets of detector telescopes(including doublesided silicon strip detectors) are placed systematically with the beam line,incorporating with Monte Carlo simulations.The data of ^(16)O on ^(89)Y target were analyzed to compare with the simulation results.It is found that the simulated distribution is agreeable with the experimental data.By assuming the pure Rutherford scattering at small scattering angles,the angular distribution of elastic scattering of^(16)O+^(89)Y at low energies can be reasonably obtained.It indicates that this set of detector setup can be used for the measurement of angular distributions of heavy-ion elastic scattering at energies around Coulomb barrier.展开更多
The heavy-ion therapy is one of the modalities to treat a patient with body tumors. In the tumor therapy, we wish to irradiate only the tumors in order to keep the normal tissues/organs undamaged. Along the range of h...The heavy-ion therapy is one of the modalities to treat a patient with body tumors. In the tumor therapy, we wish to irradiate only the tumors in order to keep the normal tissues/organs undamaged. Along the range of heavy ion passing through the matter, most of ion energy deposits at the end of the range, forming a so called Bragg peak[1]. In order to accurately determine the irradiation profiles and positions of scanned展开更多
文摘一种高性能多极双维位置灵敏平行板雪崩计数器(multi-plate parallel plate avalanchecounter,MPPAC)在兰州中能重离子加速器放射性次级束流线(radioactive ion beam line in lanzhou,RIBLL)上被应用,由二次雪崩带来的高增益使它很适合探测较高能量的较轻粒子,它主要由1个中心阳极,x,y位置栅极和2个阴极组成,位置信号由x,y位置栅极采用电荷分除法读出,使用异丁烷工作气体,气压650Pa,阳极+400V,阴极-350V时,对于α粒子位置分辨为0.55mm(半高全宽度,fwhm),位置线性色散远好于±0.2mm,探测效率大于99.2％,同时,也研究了位置分辨与阳极、阴极电压的关系,与放大器成形时间常数的依赖,随工作气压变化等。
基金Supported by the National Natural Science Foundation of China(Nos.11475013,11175011,11035007)
文摘A detector setup for the measurement of angular distribution of heavy-ion elastic scattering at energies around Coulomb barrier on the radioactive ion beam line in Lanzhou at the heavy-ion research facility in Lanzhou is designed.The beam profile and the scattering angles on the target are deduced by two parallel plate avalanche counters,and four sets of detector telescopes(including doublesided silicon strip detectors) are placed systematically with the beam line,incorporating with Monte Carlo simulations.The data of ^(16)O on ^(89)Y target were analyzed to compare with the simulation results.It is found that the simulated distribution is agreeable with the experimental data.By assuming the pure Rutherford scattering at small scattering angles,the angular distribution of elastic scattering of^(16)O+^(89)Y at low energies can be reasonably obtained.It indicates that this set of detector setup can be used for the measurement of angular distributions of heavy-ion elastic scattering at energies around Coulomb barrier.
文摘The heavy-ion therapy is one of the modalities to treat a patient with body tumors. In the tumor therapy, we wish to irradiate only the tumors in order to keep the normal tissues/organs undamaged. Along the range of heavy ion passing through the matter, most of ion energy deposits at the end of the range, forming a so called Bragg peak[1]. In order to accurately determine the irradiation profiles and positions of scanned
