Luminosity optimization near the beam-beam limit by increasing bunch length or crossing angle
Luminosity optimization near the beam-beam limit by increasing bunch length or crossing angle
复制标题
通过增加束长度或交叉角来优化接近光束极限的亮度
DOI：
10.1103/physrevstab.5.061001
复制
发表时间：
2002
影响因子：
--
通讯作者：
F. Zimmermann
中科院分区：
文献类型：
--
作者：
F. Ruggiero;F. Zimmermann
本文讨论了储存环对撞机束-束极限附近束团长度和交叉角的选择。首先，我们推导出的表达式，无论是聚束或连续的圆形光束，这是由一个单一的碰撞引起的任意交叉角和聚束长度，并为相关的亮度。然后，考虑两个碰撞点与交叉的交替平面，我们证明，如果总的光束-光束调谐移位保持不变，碰撞机的亮度增加作为一个函数的束长度和交叉角。这意味着聚束强度的相应增加。作为一个例子，我们提出了数值例子的LHC升级和VLHC。
We discuss the choice of bunch length and crossing angle near the beam-beam limit in a storage-ring collider. First, we derive expressions for the tune shifts of either bunched or continuous round beams which are induced by a single collision with arbitrary crossing angle and bunch length, and for the associated luminosities. Then, considering two collision points with alternating planes of crossing, we demonstrate that, if the total beam-beam tune shift is held constant, the collider luminosity increases as a function of bunch length and crossing angle. This implies a corresponding increase in the bunch intensity. As an illustration, we present numerical examples for an LHC upgrade and for the VLHC.