Nanometer-beam-size measurement during collisions at linear colliders.
Nanometer-beam-size measurement during collisions at linear colliders.
复制标题
线性对撞机碰撞过程中的纳米光束尺寸测量。
DOI：
10.1103/physreve.51.6119
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Yokoya
中科院分区：
文献类型：
--
作者：
Tauchi;Yokoya
我们描述了一种通过使用 ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ 对来测量未来 ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ 线性对撞机碰撞期间纳米光束尺寸的方法。大量的电子对在迎面而来的光束产生的强大库仑势中发生偏转。由于势能是光束尺寸的函数 (${\mathrm{\ensuremath{\sigma}}}_{\mathit{x}}$,${\mathrm{\ensuremath{\sigma}}}_{\mathit{y}}$)，因此这些对预计会携带此信息，特别是在其角度分布中。我们通过模拟、在现实实验条件下使用计算机程序以及分析研究详细研究了这个过程。除了光束尺寸之外，还可以精确测量两个光束之间的垂直位移和横向光束轮廓的旋转。由于对的统计量较高，这些测量结果可用于线性对撞机实时运行期间的反馈。
We describe a method to measure a nanometer beam size during collisions at future ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ linear colliders by using ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ pairs. A huge number of pairs are deflected in a strong Coulomb potential made by an oncoming beam. Since the potential is a function of the beam size (${\mathrm{\ensuremath{\sigma}}}_{\mathit{x}}$,${\mathrm{\ensuremath{\sigma}}}_{\mathit{y}}$), the pairs are expected to carry this information, especially in their angular distributions. We investigated this process in detail by simulation, using a computer program abel under realistic experimental conditions as well as by analytic studies. Besides the beam size, a vertical displacement between two beams and rotations in the transverse beam profile can be precisely measured. Because of the high statistics of pairs, the results from these measurements can be used for feedback during real-time operation of linear colliders.