arXiv 1806.030592018-06physics.acc-ph

Description of the luminosity evolution for the CERN LHC including dynamic aperture effects. Part II: application to Run 1 data

Massimo Giovannozzi, Frederik F Van der Veken

备注：: v2 (after having implemented refereeing comments)
DOI：: 10.1016/j.nima.2018.08.019

英文摘要：

In recent years, modelling the evolution of beam losses in circular proton machines starting from the concept of dynamic aperture its time evolution has been the focus of intense research. Results from single-particle non-linear beam dynamics have been used to build simple models that proved to be in good agreement with beam measurements. These results have been generalised, thus opening the possibility to describe also the luminosity evolution in a circular hadron collider. In a companion paper (Part I), the derivation of a scaling law for luminosity, which includes both burn off and pseudo-diffusive effects, has been carried out. In this paper, the proposed models are applied to the analysis of the data collected during the CERN Large Hadron Collider (LHC) Run 1. A data set referring to the proton physics runs for the years 2011 and 2012 has been analysed and the results are proposed and discussed in detail in this paper.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

阅读原文

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

本文内容

英文摘要相关论文

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

继续探索

相关论文

Beam-based aperture measurements with movable collimator jaws as performance booster of the CERN Large Hadron Collider

The beam aperture of a particle accelerator defines the clearance available for the circulating beams and is a parameter of paramount importance for the accelerator performance. At the CERN Large Hadron Collider (LHC), the knowledge and control of the available aperture is crucial because the nominal proton beams carry an energy of 362 MJ stored in a superconducting environment. Even a tiny fraction of beam losses could quench the superconducting magnets or cause severe material damage. Furthermore, in a circular collider, the performance in terms of peak luminosity depends to a large extent o…

2021-06-17physics.acc-ph

Description of the luminosity evolution for the CERN LHC including dynamic aperture effects. Part I: the model

In recent years, modelling the evolution of beam losses in circular proton machines starting from the evolution of the dynamic aperture has been the focus of intense research. Results from single-particle, non-linear beam dynamics have been used to build simple models that proved to be in good agreement with beam measurements. These results have been generalised, thus opening the possibility to describe also the luminosity evolution in a circular hadron collider. In this paper, the focus is on the derivation of scaling laws for luminosity, which include both burn off and additional pseudo-diff…

2019-01-30physics.acc-ph

Tests of the CERN Proton Linac Performance for LHC-Type Beams

As the pre-injector of the LHC injector chain, the proton linac at CERN is required to provide a high-intensity (180mA) beam to the Proton Synchrotron Booster. The results of measurements at this intensity will be presented. Furthermore, the linac is now equipped with bunch shape monitors from INR, Moscow, which have allowed the comparison of the Alvarez tank RF settings with simulations.

2000-08-17physics.acc-ph

Electron cloud in the CERN accelerators (PS, SPS, LHC)

Several indicators have pointed to the presence of an Electron Cloud (EC) in some of the CERN accelerators, when operating with closely spaced bunched beams. In particular, spurious signals on the pick ups used for beam detection, pressure rise and beam instabilities were observed at the Proton Synchrotron (PS) during the last stage of preparation of the beams for the Large Hadron Collider (LHC), as well as at the Super Proton Synchrotron (SPS). Since the LHC has started operation in 2009, typical electron cloud phenomena have appeared also in this machine, when running with trains of closely …

2013-09-26physics.acc-ph

CERN Accelerator Strategy

The CERN strategy for future accelerator projects is outlined and the role of the HE-LHC inside this strategy is described.

2011-08-04physics.acc-ph

News from CERN, LHC Status and Strategy for Linear Colliders

This paper presents the latest development at CERN, concentrating on the status of the LHC and the strategy for future linear colliders. The immediate plans include the exploitation of the LHC at its design luminosity and energy as well as upgrades to the LHC (luminosity and energy) and to its injectors. This may be complemented by a linear electron-positron collider, based on the technology being developed by the Compact Linear Collider and by the International Linear Collider and/or by a high-energy electron-proton collider. This contribution describes the various future directions, all of w…

2012-02-27hep-exhep-phphysics.acc-ph

更多相关论文收起更多论文

Impedance reduction of the High-frequency Cavities in the CERN PS by Multi-harmonic Feedback

In the framework of the "LHC Injectors Upgrade" (LIU) project, the CERN Proton Synchrotron (PS) is being prepared as a pre-injector for the Large Hadron Collider at high luminosity (HL-LHC). RF systems at 20 MHz, 40 MHz and 80 MHz are required for longitudinal beam manipulations to provide 25 ns bunch spacing and short bunches at transfer to the Super Proton Synchrotron (SPS). Beam induced voltage in these cavities causes transient beam-loading and uncontrolled longitudinal emittance blow-up. To reduce the impedance beyond the reach of the wide-band feedback around the power amplifier, a new m…

2019-10-15physics.acc-ph

Crystal simulations: the road from the SPS to the LHC

The understanding of the crystal collimation and extraction experiments performed in the recent decade at CERN SPS, FNAL Tevatron, IHEP U-70 and RHIC is reviewed from the standpoint of Monte Carlo simulations. The expectations for the LHC - the crystal efficiency and the requirements to a crystal - are outlined basing on the same computer model verified in the above experiments. Finally, we discuss key issues for the future experiments at CERN SPS and Tevatron aiming to reach the most efficient channeling and to bring these tests to the future LHC as close as possible.

2005-07-16physics.acc-ph

强化学习在欧洲核子中心质子同步加速器（CERN PS）LHC束流优化中的应用

Reinforcement Learning applied to Optimization of LHC beams in the CERN Proton Synchrotron

CERN（欧洲核子研究组织）

本研究将卷积神经网络与Soft-Actor-Critic强化学习智能体结合，实现CERN PS纵向三重分裂的自动化优化，其2025年部署的自主控制器为CERN注入器复合体首批强化学习束流质量优化系统之一。

2026-07-30physics.acc-ph

Microwave Schottky diagnostic systems for the Fermilab Tevatron, Recycler, and CERN LHC

A means for non-invasive measurement of transverse and longitudinal characteristics of bunched beams in synchrotrons has been developed based on high sensitivity slotted waveguide pickups. The pickups allow for bandwidths exceeding hundreds of MHz while maintaining good beam sensitivity characteristics. Wide bandwidth is essential to allow bunch-by-bunch measurements by means of a fast gate. The Schottky detector system is installed and successfully commissioned in the Fermilab Tevatron, Recycler and CERN LHC synchrotrons. Measurement capabilities include tune, chromaticity, and momentum sprea…

2011-08-01hep-exphysics.acc-phphysics.ins-det

Performance and luminosity models for heavy-ion operation at the CERN Large Hadron Collider

A good understanding of the luminosity performance in a collider, as well as reliable tools to analyse, predict, and optimise the performance, are of great importance for the successful planning and execution of future runs. In this article, we present two different models for the evolution of the beam parameters and the luminosity in heavy-ion colliders. The first, Collider Time Evolution (CTE) is a particle tracking code, while the second, the Multi-Bunch Simulation (MBS), is based on the numerical solution of ordinary differential equations for beam parameters. As a benchmark, we compare si…

2021-07-20physics.acc-ph

Machine Parameters and Projected Luminosity Performance of Proposed Future Colliders at CERN

In response to a request from the CERN Scientific Policy Committee (SPC), the machine parameters and expected luminosity performance for several proposed post-LHC collider projects at CERN are compiled: three types of hadron colliders (HL-LHC upgrade, FCC-hh and HE-LHC), a circular lepton collider (FCC-ee), a linear lepton collider (CLIC), and three options for lepton-hadron colliders (LHeC, HE-LHeC, and FCC-eh). Particular emphasis is put on availability, physics run time, and efficiency. The information contained in this document was presented at the SPC Meeting of September 2018. It will se…

2018-10-30hep-exphysics.acc-ph

CERN大型强子对撞机LHCb探测器升级II期的能量沉积研究

Energy deposition studies for the Upgrade II of LHCb at the CERN Large Hadron Collider

本文研究了LHCb升级II期在75倍设计亮度下运行对探测器、LHC磁铁及电子设备造成的能量沉积影响，并提出需重新设计插入区布局以确保安全运行。

2023-10-26hep-exphysics.acc-ph

Hadron Fluence Measurements with LiF-TLD Sensors at the Proton Synchrotron Accelerator at CERN

In view of the implementation of beam-monitoring sensors for CERN's Large Hadron Collider (LHC), and also in order to validate Thermoluminescence Detectors as a versatile tool to measure ionizing radiation doses in mixed fields at hadron colliders such as the LHC, chemical vapor deposition diamond sensors have been evaluated and calibrated at CERN's Proton Synchrotron accelerator. Special attention was paid to understanding whether lithiumfluoride thermoluminescence detectors are suitable as measuring devices in these radiation fields.

2010-02-15hep-exphysics.acc-phphysics.ins-det

CERN LHC上质子束晕的非线性扩散测量

Measurement of the nonlinear diffusion of the proton beam halo at the CERN LHC

本文基于Nekhoroshev定理分析框架，通过监测CERN LHC准直器颚板受控移动期间的束流损失信号，测量了质子束晕的非线性扩散系数，验证了其与理论假设的高度一致性，并评估了束束补偿对束尾扩散的有效性。

2024-10-14nlin.CDphysics.acc-ph

Analysis of the non-linear beam dynamics at top energy for the CERN Large Hadron Collider by means of a diffusion model

In this paper the experimental results of the recent dynamic aperture at top energy for the CERN Large Hadron Collider are analysed by means of a diffusion model whose novelty consists of deriving the functional form of the diffusion coefficient from Nekhoroshev theorem. This theorem provides an optimal estimate of the remainder of perturbative series for Hamiltonian systems. As a consequence, a three-parameter diffusion model is built that reproduces the experimental results with a high level of accuracy. A detailed discussion of the physical interpretation of the proposed model is also prese…

2019-07-25nlin.CDphysics.acc-ph

Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders (BB2013), CERN, Geneva, Switzerland, 18 - 22 Mar 2013

This report contains the Proceedings of the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders held at CERN from 18 to 22 March 2013. It was the first of its kind after the successful start of LHC operation where a vast amount of beam-beam observations emerged. It brought together 58 international experts in the field and the purpose of this workshop was to review the present knowledge in the fields of beam-beam theory, simulations and observations. In the summary session the participants acknowledged the enormous progress made in recent years and the introduction of new concepts and …

2014-10-23physics.acc-phphysics.ed-ph