【摘 要】
：
BEPCⅡ是BEPC的升级工程,它被设计工作在亮度为1×1033 cm-2·s-1的τ-charm能区.根据用几个不同的程序进行的束-束相互作用的模拟结果,BEPCⅡ的亮度较设计亮度有不同程度的
【机 构】
：
中国科学院高能物理研究所,北京大学重离子物理研究所
论文部分内容阅读
BEPCⅡ是BEPC的升级工程,它被设计工作在亮度为1×1033 cm-2·s-1的τ-charm能区.根据用几个不同的程序进行的束-束相互作用的模拟结果,BEPCⅡ的亮度较设计亮度有不同程度的下降.其中一个程序的计算结果表明,在原设计对撞模式下运行,BEPCⅡ的运行亮度只能达到0.50×1033 cm-2·s-1.为了提高BEPCⅡ的运行亮度,研究了小动量压缩因子的对撞模式,亮度可以提高到0.54×1033 cm-2·s-1.相应的束长由1.5 cm减小到1.2 cm.为了和1.2 cm的束长相匹配,又研究了对撞点垂直β函数等于1.2 cm的对撞模式.根据束-束相互作用的模拟结果,选择了几个高亮度的工作点,对它们的线性lattice和动力学孔径等进行了研究和优化.其中,最高的亮度可以达到0.828×1033 cm-2·s-1.
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