• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical Review. Accelerators and Beams >Calculations of safe collimator settings and span class="aps-inline-formula"math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"mrowmsupmrowmiβ/mi/mrowmrowmo*/mo/mrow/msup/mrow/math/span at the CERN Large Hadron Collider
【24h】

Calculations of safe collimator settings and span class="aps-inline-formula"math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"mrowmsupmrowmiβ/mi/mrowmrowmo*/mo/mrow/msup/mrow/math/span at the CERN Large Hadron Collider

机译：安全准直仪设置和 class =“ aps-inline-formula”> β * 大型强子对撞机

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The first run of the Large Hadron Collider (LHC) at CERN was very successful and resulted in important physics discoveries. One way of increasing the luminosity in a collider, which gave a very significant contribution to the LHC performance in the first run and can be used even if the beam intensity cannot be increased, is to decrease the transverse beam size at the interaction points by reducing the optical function ${ensuremath{eta}}^{*}$. However, when doing so, the beam becomes larger in the final focusing system, which could expose its aperture to beam losses. For the LHC, which is designed to store beams with a total energy of 362 MJ, this is critical, since the loss of even a small fraction of the beam could cause a magnet quench or even damage. Therefore, the machine aperture has to be protected by the collimation system. The settings of the collimators constrain the maximum beam size that can be tolerated and therefore impose a lower limit on ${ensuremath{eta}}^{*}$. In this paper, we present calculations to determine safe collimator settings and the resulting limit on ${ensuremath{eta}}^{*}$, based on available aperture and operational stability of the machine. Our model was used to determine the LHC configurations in 2011 and 2012 and it was found that ${ensuremath{eta}}^{*}$ could be decreased significantly compared to the conservative model used in 2010. The gain in luminosity resulting from the decreased margins between collimators was more than a factor 2, and a further contribution from the use of realistic aperture estimates based on measurements was almost as large. This has played an essential role in the rapid and successful accumulation of experimental data in the LHC.
机译：CERN的大型强子对撞机（LHC）的首次试飞非常成功，并带来了重要的物理学发现。增加对撞机发光度的一种方法是，通过减小入射角处横向光束的大小，这可以在第一轮试验中对LHC性能做出重大贡献，即使无法提高光束强度也可以使用。光学函数$ { ensuremath { beta}} ^ {*} $。但是，这样做时，光束在最终聚焦系统中会变大，这可能会使其孔径暴露于光束损失中。对于设计用于存储总能量为362 MJ的光束的LHC来说，这是至关重要的，因为即使光束的一小部分损失都可能导致磁体失超甚至损坏。因此，必须通过准直系统保护机器孔径。准直仪的设置限制了可以容许的最大光束大小，因此对$ { ensuremath { beta}} ^ {*} $施加了下限。在本文中，我们根据机器的可用光圈和操作稳定性，给出确定安全准直仪设置以及$ { ensuremath { beta}} ^ {*} $的最终限制的计算。我们的模型用于确定2011年和2012年的LHC配置，发现与2010年使用的保守模型相比，$ { ensuremath { beta}} ^ {*} $可以大大降低。准直器之间的边距减少所导致的误差超过2倍，而基于测量值的实际孔径估计值的进一步贡献几乎一样大。这在大型强子对撞机快速，成功地积累实验数据中发挥了重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利