Assessment of the performance of High-Luminosity LHC operational scenarios: integrated luminosity and effective pile-up density
Assessment of the performance of High-Luminosity LHC operational scenarios: integrated luminosity and effective pile-up density
复制标题
高光度大型强子对撞机操作场景的性能评估：综合光度和有效堆积密度
DOI：
--
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Napsuciale
中科院分区：
文献类型：
--
作者：
L. Medina;R. Tomás;G. Arduini;M. Napsuciale
高亮度大型强子对撞机（HL-LHC）实验将在14 TeV质心能量的质子-质子碰撞事件堆积的前所未有的水平上运行。在本文中，我们研究了基线的性能和一系列的替代方案，在交付的综合光度和质量（堆积密度）。引入了一个新的品质因数，有效堆积密度，一个概念，反映了预期的检测器效率在重建事件顶点为一个给定的操作方案，作为机器和实验双方之间的联系。已经提出了替代方案，以改善基线性能或在特殊限制的情况下提供业务计划。用β*-水准测量方法模拟了最佳填充随HL-LHC最新参数的变化，并从积分光度和有效堆积密度两个方面对结果进行了讨论。螃蟹亲吻计划，堆积密度控制的一个建议的方案，重新评估在这个新的角度与更新的光束和光学参数。由于蟹腔噪声的影响，完整的螃蟹交叉，减少燃烧的横截面，预期的综合光度的估计，也提出了。
The High-Luminosity Large Hadron Collider (HL-LHC) experiments will operate at unprecedented levels of event pile-up from proton–proton collisions at 14 TeV centre-of-mass energy. In this paper, we study the performance of the baseline and a series of alternative scenarios in terms of the delivered integrated luminosity and its quality (pile-up density). A new figure-of-merit is introduced, the effective pile-up density, a concept that reflects the expected detector efficiency in the reconstruction of event vertices for a given operational scenario, acting as a link between the machine and experimental sides. Alternative scenarios have been proposed either to improve the baseline performance or to provide operational schemes in the case of particular limitations. Simulations of the evolution of their optimum fills with the latest set of parameters of the HL-LHC are performed with β*-levelling, and the results are discussed in terms of both the integrated luminosity and the effective pile-up density. The crab kissing scheme, a proposed scenario for pile-up density control, is re-evaluated under this new perspective with updated beam and optics parameters. Estimates on the expected integrated luminosity due to the impact of crab cavity noise, full crab crossing, and reduced cross section for burn-off, are also presented.