论文标题
高光度大强壮的强子对撞机，带有激光冷却的等轴离子束
High-luminosity Large Hadron Collider with laser-cooled isoscalar ion beams
论文作者
论文摘要
本文介绍了伽马工厂倡议的案例研究之一，这是CERN加速器综合体中离子束新操作方案的提议。它的目标是通过用高亮度核核核核酸核核酸核酸核酸核酸素核核核定程序补充基于LHC的研究的范围和精度。它的众多物理学重点包括对光子 - 光子碰撞中的独家希格斯 - 玻色子产生的研究以及电子（EW）参数的精确测量。有两种提高LHC发光度的主要方法，不需要升级CERN注射器：（1）修改梁胶体光学元件和（2）（2）碰撞光束的横向发射率的降低。前一项计划由正在进行的高亮度（HL-LHC）项目采用。本文提出了后一种，仅适用于离子束。它基于SPS平顶能量的部分剥离离子的激光冷却。对于满足当前梁操作约束并且对EW物理特别有吸引力的等构钙梁，横梁发射率可在$ 8 $秒的长度冷却阶段降低$ 5 $。 $ l_ {nn} = 4.2 \ times 10^{34} \，$ s $^{ - 1} $ cm $^{ - 2} $的预测核子 - 核素光度为$ l_ {nn} = 4.2 \ times 10^{34} \，$ s $^{ - 1} $ cm $^{ - 2} $，用于LHC最高能量的冷却钙梁的碰撞，可与Hll-lh-lhlc Protist collision collisiond coldixcipt coldixction collisivation LHC最高能量相提并论。本文提出的计划，如果未来的伽玛工厂原理证明实验证实，可以在CERN实施较小的基础设施投资。
This paper presents one of the case studies of the Gamma Factory initiative -- a proposal of a new operation scheme of ion beams in the CERN accelerator complex. Its goal is to extend the scope and precision of the LHC-based research by complementing the proton-proton collision programme with the high-luminosity nucleus-nucleus one. Its numerous physics highlights include studies of the exclusive Higgs-boson production in photon-photon collisions and precision measurements of the electroweak (EW) parameters. There are two principal ways to increase the LHC luminosity which do not require an upgrade of the CERN injectors: (1) modification of the beam-collision optics and (2) reduction of the transverse emittance of the colliding beams. The former scheme is employed by the ongoing high-luminosity (HL-LHC) project. The latter one, applicable only to ion beams, is proposed in this paper. It is based on laser cooling of bunches of partially stripped ions at the SPS flat-top energy. For isoscalar calcium beams, which fulfil the present beam-operation constrains and which are particularly attractive for the EW physics, the transverse beam emittance can be reduced by a factor of $5$ within the $8$ seconds long cooling phase. The predicted nucleon-nucleon luminosity of $L_{NN}= 4.2 \times 10^{34}\,$s$^{-1}$cm$^{-2}$ for collisions of the cooled calcium beams at the LHC top energy is comparable to the levelled luminosity for the HL-LHC proton-proton collisions, but with reduced pile-up background. The scheme proposed in this paper, if confirmed by the future Gamma Factory proof-of-principle experiment, could be implemented at CERN with minor infrastructure investments.
