大型强子对撞机碰撞时动态孔径的计算

N. Gelfand
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引用次数: 0

摘要

使用跟踪代码TEVLAT对大型强子对撞机(LHC)晶格在IP1和IP5处具有300 /spl mu/r交叉角的5.1版本的动态孔径进行了估计。本文计算的动态孔径是由于高梯度四极(MQX)在IR1和IR5两个低/spl β /相互作用区域的磁场误差造成的。没有错误被分配到磁体在圆弧区域的晶格,也没有光束效应纳入。动态孔径以光束发射度为3.75 mm mr时光束的/spl sigma/表示。在仅进行短期跟踪的情况下,多极子和交叉角的综合效应产生的平均动态孔径为/spl ap/11.7/spl plusmn/1.2。
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A calculation of the dynamic aperture of the LHC at collision
The dynamic aperture for version 5.1, with a 300 /spl mu/r crossing angle at IP1 and IP5, of the Large Hadron Collider (LHC) lattice has been estimated using the tracking code TEVLAT. The dynamic aperture calculated here is due to the magnetic field errors in the high gradient quadrupoles (MQX) in the two low-/spl beta/ interaction regions at IR1 and IR5. No errors were assigned to the magnets in the arc regions of the lattice, nor were beam-beam effects incorporated. The dynamic aperture is expressed in terms of the /spl sigma/ of the beam corresponding to the beam emittance of 3.75 mm mr. With only short term tracking, the combined effect of the multipoles and the crossing angle is to yield an average (over multipole coefficients generated with 100 different seeds) dynamic aperture of /spl ap/11.7/spl plusmn/1.2.
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