The HL-LHC Impedance Model and Aspects of Beam Stability
The HL-LHC Impedance Model and Aspects of Beam Stability
复制标题
HL-LHC 阻抗模型和光束稳定性方面
DOI：
10.18429/jacow-ipac2016-mopor009
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发表时间：
2016
影响因子：
1.7
通讯作者：
B. Salvant
中科院分区：
文献类型：
--
作者：
N. Biancacci;K. Li;E. Métral;B. Salvant
LHC升级到HL-LHC从束流动力学的角度预见了新的具有挑战性的操作场景。为了确保良好的机器操作和性能，机器阻抗，以及其他可能的不稳定性来源，如束-束和电子云，需要仔细量化，也从当前的LHC操作中获益。在这项工作中，我们提出的HL-LHC阻抗模型主要集中在低阻抗准直器和螃蟹腔的贡献：第一个降低了宽带阻抗基线由于较高的下巴材料的电导率，第二个增加机器亮度的代价增加耦合束稳定八极电流阈值。还将讨论其他元件，如喷射保护吸收器（TDI）。
The LHC upgrade to the HL-LHC foresees new challenging operational scenarios from the beam dynamics point of view. In order to ensure good machine operation and performance, the machine impedance, among other possible sources of instabilities like beam-beam and electron cloud, needs to be carefully quantified profiting also from the current LHC operation. In this work we present the HL-LHC impedance model mainly focusing on the contribution of low-impedance collimators and crab cavities: the first reduces the broad-band impedance baseline thanks to the higher jaw material conductivity, the second increases the machine luminosity at the price of increasing the coupled bunch stabilizing octupole current threshold. Other elements like the injection protection absorber (TDI) will be also discussed.