Collimation of heavy-ion beams in the HE-LHC

Collimation of heavy-ion beams in the HE-LHC
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HE-LHC 中重离子束的准直

DOI:
10.1088/1742-6596/1350/1/012072
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发表时间:
2019
期刊:
Conference Series
影响因子:
--
通讯作者:
Abramov A
Abramov A
中科院分区:
--
文献类型:
--
作者:
Abramov A

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作为欧洲核子研究中心未来圆形对撞机(FCC)研究的一部分,已经启动了一项将在LHC隧道中建造的未来对撞机的设计研究,即高能大型强子对撞机(HE-LHC)。它将提供质量中心能量为27 TeV的质子碰撞以及同等磁刚度下的重离子碰撞。HE-LHC是在使用现有隧道的严格限制下设计的,因此由此产生的晶格和光学器件在布局和相位提前方面与LHC不同。在HE-LHC中,除了质子束外,还需要对离子束准直系统的性能进行评价。在离子束的情况下,相对论性重离子在准直器中可能经历的碎裂和电磁解离,以及HE-LHC前所未有的每个核子的能量,需要专门的模拟。本文给出了用SixTrack-FLUKA耦合框架对铅离子(208 Pb 82+)束进行准直效率研究的结果。这些包括损耗图与估计的失超极限的比较,以及在超导孔的关键部分的机器,如色散抑制器的损耗尖峰的详细考虑。
A design study for a future collider to be built in the LHC tunnel, the High-Energy Large Hadron Collider (HE-LHC), has been launched as part of the Future Circular Collider (FCC) study at CERN. It would provide proton collisions at a centre-of-mass energy of 27 TeV as well as collisions of heavy ions at the equivalent magnetic rigidity. HE-LHC is being designed under the stringent constraint of using the existing tunnel and therefore the resulting lattice and optics differ in layout and phase advance from the LHC. It is necessary to evaluate the performance of the collimation system for ion beams in HE-LHC in addition to proton beams. In the case of ion beams, the fragmentation and electromagnetic dissociation that relativistic heavy ions can undergo in collimators, as well as the unprecedented energy per nucleon of the HE-LHC, requires dedicated simulations. Results from a study of collimation efficiency for the nominal lead ion (208 Pb 82+) beams performed with the SixTrack-FLUKA coupling framework are presented. These include loss maps with comparison against an estimated quench limit as well as detailed considerations of loss spikes in the superconducting aperture for critical sections of the machine such as the dispersion suppressors.
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