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Modeling of nonlinear effects due to head-on beam-beam interactions

机译:正面光束相互作用引起的非线性效应建模

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The beam-beam interaction is one of the most severe limitations on the performance of circular colliders, as it is an unavoidable strong nonlinear effect. As one aspires for greater luminosity in future colliders, one will simultaneously achieve stronger beam-beam interactions. We study the limitations caused by strong incoherent head-on beam-beam interactions, using a new code (cabin) that calculates on a graphics processing unit (GPU), allowing for a detailed description of the long-term particle trajectories in 6D phase space. The evolution of the beam emittance and beam intensity has been monitored to study the impact quantitatively, while frequency map analysis has been performed to understand the impact qualitatively. Results from cabin have shown good quantitative agreement with dedicated experiments in the Large Hadron Collider (LHC). For large beam-beam tune shifts, alternatives to the LHC tunes have been found to improve the beam quality. Schemes devised to cancel beam-beam driven resonances, by use of specific intermediate phase advances between the interaction points, work very well with zero crossing angle, and the accuracy required is achievable. Due to lack of symmetry, these schemes have an almost negligible impact with a significant crossing angle. The hourglass effect has been found to reduce the detrimental effects caused by the chromaticity and vice versa. The optimal level of the hourglass effect has been achieved when ${ensuremath{eta}}^{*}=1.5{ensuremath{sigma}}_{s}$. The ultimate parameters of the Future Circular Hadron Collider (FCC-hh) seem within reach, in absence of residual odd resonances.
机译:梁束相互作用是圆形对撞机性能的最严重限制之一,因为它是不可避免的强非线性效应。随着人们渴望在未来的对撞机中获得更大的发光度,人们将同时实现更强的光束与光束的相互作用。我们使用在图形处理单元(GPU)上计算的新代码(机舱),研究了由于强不相干的正面电子束相互作用引起的局限性,从而可以详细描述6D相空间中的长期粒子轨迹。监测束发射率和束强度的变化以定量研究影响,而进行频率图分析以定性了解影响。机舱的结果与大型强子对撞机(LHC)中的专用实验显示出良好的定量一致性。对于较大的光束调谐偏移,已发现LHC调谐的替代方法可以改善光束质量。通过使用相互作用点之间的特定中间相位提前量来设计消除光束驱动共振的方案,在零交叉角的情况下可以很好地工作,并且可以达到所需的精度。由于缺乏对称性,这些方案的交叉角很大,几乎可以忽略不计。已经发现沙漏效应减少了由色度引起的有害影响,反之亦然。当$ { ensuremath { beta}} ^ {*} = 1.5 { ensuremath { sigma}} _ {s} $时,沙漏效果达到了最佳水平。在没有残留奇数共振的情况下,未来环形强子对撞机(FCC-hh)的最终参数似乎可以达到。

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