目的研制用于测量中低能质子回旋加速器产生的伽玛场的空气电离室。方法分别采用有限元分析方法和蒙特卡罗方法模拟计算空气电离室的电场分布和伽玛射线在电离室中的能量沉积,确定电离室各个部分的机械尺寸和结构;根据中低能回旋加速器...目的研制用于测量中低能质子回旋加速器产生的伽玛场的空气电离室。方法分别采用有限元分析方法和蒙特卡罗方法模拟计算空气电离室的电场分布和伽玛射线在电离室中的能量沉积,确定电离室各个部分的机械尺寸和结构;根据中低能回旋加速器实际运行时的剂量率情况,设计了低电流放大器,并进行了初步校准试验。结果模拟结果表明空气电离室对1～8 MeV的光子灵敏度在±30%以内,信号输出噪声小于2 m V,运行稳定。结论初步测试结果表明,该电离室工作稳定,能量响应范围宽,满足设计指标要求。展开更多
A 100 MeV H- compact cyclotron is under construction at China Institute of Atomic Energy (CYCIAE-100). The proton beams of 75 MeV-100 MeV at an intensity of 200 μA will be extracted in dual opposite directions by cha...A 100 MeV H- compact cyclotron is under construction at China Institute of Atomic Energy (CYCIAE-100). The proton beams of 75 MeV-100 MeV at an intensity of 200 μA will be extracted in dual opposite directions by charge exchange stripping devices. The crossing point at the switching magnet center is fixed inside the magnet yoke and the stripping points for various extraction energies are calculated by the code CYCTRS. With the code GOBLIN, we can calculate the transfer matrix including the dispersion effects from the stripping point to the switch magnet. The beam distribution just after stripping foil can be obtained from the multi-particle tracking code COMA and the extracted beam parameters after the switch magnet such as emittance, envelope, dispersion, energy spread, bunch length, etc. are given by the extraction orbit simulations.展开更多
文摘目的研制用于测量中低能质子回旋加速器产生的伽玛场的空气电离室。方法分别采用有限元分析方法和蒙特卡罗方法模拟计算空气电离室的电场分布和伽玛射线在电离室中的能量沉积,确定电离室各个部分的机械尺寸和结构;根据中低能回旋加速器实际运行时的剂量率情况,设计了低电流放大器,并进行了初步校准试验。结果模拟结果表明空气电离室对1～8 MeV的光子灵敏度在±30%以内,信号输出噪声小于2 m V,运行稳定。结论初步测试结果表明,该电离室工作稳定,能量响应范围宽,满足设计指标要求。
文摘A 100 MeV H- compact cyclotron is under construction at China Institute of Atomic Energy (CYCIAE-100). The proton beams of 75 MeV-100 MeV at an intensity of 200 μA will be extracted in dual opposite directions by charge exchange stripping devices. The crossing point at the switching magnet center is fixed inside the magnet yoke and the stripping points for various extraction energies are calculated by the code CYCTRS. With the code GOBLIN, we can calculate the transfer matrix including the dispersion effects from the stripping point to the switch magnet. The beam distribution just after stripping foil can be obtained from the multi-particle tracking code COMA and the extracted beam parameters after the switch magnet such as emittance, envelope, dispersion, energy spread, bunch length, etc. are given by the extraction orbit simulations.
