Abstract
We present the first conceptual solution for a collimation system for the hadron–hadron option of the Future Circular Collider (FCC-hh). The collimation layout is based on the scaling of the present Large Hadron Collider collimation system to the FCC-hh energy and it includes betatron and momentum cleaning, as well as dump protection collimators and collimators in the experimental insertions for protection of the final focus triplet magnets. An aperture model for the FCC-hh is defined and the geometrical acceptance is calculated at injection and collision energy taking into account mechanical and optics imperfections. The performance of the system is then assessed through the analysis of normalized halo distributions and complete loss maps for an ideal lattice. The performance limitations are discussed and a solution to improve the system performance with the addition of dispersion suppression collimators around the betatron cleaning insertion is presented.
Highlights
The hadron-hadron option of the Future Circular Collider study, FCC-hh [1, 2], is designed to provide pp collisions at a centre of mass energy of 100 TeV
The ambitious FCC-hh goal to accumulate stored beam energies up to 8.5 GJ, which surpasses by more than a factor 20 the present state-of-the-art set by the oper455 ating Large Hadron Collider, poses outstanding concerns for the operation in a superconducting environment
As a starting point for the studies, we have shown first estimates of the avail460 able machine aperture for FCC-hh
Summary
The hadron-hadron option of the Future Circular Collider study, FCC-hh [1, 2], is designed to provide pp collisions at a centre of mass energy of 100 TeV. 20 LHC collimation system, validated up to energies of 6.5 TeV and stored beam energy of about 300 MJ [9, 10], the first conceptual solution for the FCC-hh collimation is a scaled-up system derived from the present LHC design This conservative, yet solid approach, allows us to evaluate the achievable performance with the current state-of-the-art technology and to start a mechanical. The results of detailed particle tracking simulations are presented and the performance of the system at injection and collision energy is assessed through the analysis of proton loss maps. In addition to the minimum allowed beam lifetime, the key parameters that determine the target performance of a collimation system are the beam intensity and the quench level Rq, given here 70 in units of protons/m/s. 75 energy deposition studies at critical loss locations, this formalism based on estimates of the protons lost on the accelerator aperture is well suited for a first system design and performance optimization. These aspects will be addressed in future iterations of this conceptual system design
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