The practical Pomeron for high energy proton collimation
The practical Pomeron for high energy proton collimation
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DOI：
10.1140/epjc/s10052-016-4363-7
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Robert Appleby;R. Barlow;J. Molson;M. Serluca;A. Toader
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作者：
Robert Appleby;R. Barlow;J. Molson;M. Serluca;A. Toader
我们提出了一个描述从ISR到Tevatron能量的质子散射数据的模型，该模型可以应用于LHC和FCC等高能加速器的准直。准直器去除了束晕粒子，这样它们就不会撞击机器的脆弱区域，如超导磁铁和实验区。在模拟准直器夹爪的效果时，模拟质子在小动量转移时的散射是至关重要的，因为这些质子随后可以在环的几圈后消失。在高能时，这些软过程可用Pmer on交换模型很好地描述。我们研究了弹性和单衍射离解截面在很大能量范围内的行为，并表明该模型可以用来描述目前可用的各种高能弹性和衍射数据。特别是，它模拟了低质量绕射解离，其中存在丰富的共振结构，从而预测了适合大型强子对撞机的运动学范围内的微分和积分截面。我们把这个模型的物理原理融入到束跟踪程序MERLIN中，并用它来模拟大型强子对撞机准直器中束晕损失的结果图。
We present a model which describes proton scattering data from ISR to Tevatron energies, and which can be applied to collimation in high energy accelerators, such as the LHC and FCC. Collimators remove beam halo particles, so that they do not impinge on vulnerable regions of the machine, such as the superconducting magnets and the experimental areas. In simulating the effect of the collimator jaws it is crucial to model the scattering of protons at small momentum transfert, as these protons can subsequently survive several turns of the ring before being lost. At high energies these soft processes are well described by Pomeron exchange models. We study the behaviour of elastic and single-diffractive dissociation cross sections over a wide range of energy, and show that the model can be used as a global description of the wide variety of high energy elastic and diffractive data presently available. In particular it models low mass diffraction dissociation, where a rich resonance structure is present, and thus predicts the differential and integrated cross sections in the kinematical range appropriate to the LHC. We incorporate the physics of this model into the beam tracking code MERLIN and use it to simulate the resulting loss maps of the beam halo lost in the collimators in the LHC.