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arXiv 1806.08883physics.acc-ph
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Higgs工厂μ子对撞机超导磁体及其束流衰变辐射防护

The Higgs Factory Muon Collider Superconducting Magnets and Their Protection Against Beam Decay Radiation

N. V. Mokhov, V. V. Kashikhin, S. I. Striganov, I. S. Tropin, A. V. Zlobin

摘要:

低能中光度μ子对撞机(MC)正在研究作为一个可能的希格斯工厂(HF)。来自μ子衰变的电子将在HF对撞机环的超导磁体中沉积超过300 kW。这对MC储存环(SR)和相互作用区(IR)中使用的超导(SC)磁体提出了重大挑战。提出了在大孔径中提供高操作梯度和磁场的磁体设计,以容纳由于低\b{eta} * 而产生的大尺寸μ子束,以及冷却系统以拦截来自衰变电子诱导的簇射的大量热沉积。晶格元件MC SR中热沉积的特定分布需要大孔径磁体来容纳厚的高Z吸收体以保护SC线圈。基于开发的MARS 15模型和密集的模拟,一个复杂的辐射防护系统的对撞机SR和IR的设计,使超导线圈的峰值功率密度低于失超极限,并减少动态热沉积在冷质量的一个因素100。该系统由紧密的钨掩模在磁体互连区域和椭圆形钨衬垫在磁体孔径优化为每个磁体。它还减少了对撞机探测器中的背景粒子通量。

英文摘要:

Low-energy medium-luminosity Muon Collider (MC) is being studied as a possible Higgs Factory (HF). Electrons from muon decays will deposit more than 300 kW in superconducting magnets of the HF collider ring. This imposes significant challenges to superconducting (SC) magnets used in the MC storage ring (SR) and interaction regions (IR). The magnet designs are proposed which provide high operating gradient and magnetic field in a large aperture to accommodate the large size of muon beams due to low \b{eta}* as well as the cooling system to intercept the large heat deposition from the showers induced by decay electrons. Specific distribution of heat deposition in the lattice elements MC SR requires large aperture magnets to accommodate thick high-Z absorbers to protect the SC coils. Based on the developed MARS15 model and intense simulations, a sophisticated radiation protection system was designed for the collider SR and IR to bring the peak power density in the superconducting coils below the quench limit and reduce the dynamic heat deposition in the cold mass by a factor of 100. The system consists of tight tungsten masks in the magnet interconnect regions and elliptical tungsten liners in magnet aperture optimized for each magnet. It also reduces the background particle fluxes in the collider detector.

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