Conveners
HE LHC: Options and beam-beam
- Angeles Faus-Golfe (Laboartoire de l'Accelerateur Lineaire)
HE LHC: Parameters and optics (review)
- Andrei Seryi (University of Oxford (GB))
HE LHC: Collimation and beam dynamics (review)
- Yunhai Cai (SLAC)
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John Jowett (CERN)10/04/2018, 13:30HE-LHC
We take a first look at the performance of the HE-LHC as a heavy-ion collider, based on the beams foreseen to be available during the high-luminosity heavy-ion phase of the LHC that will start in 2021. Like the FCC, the HE-LHC benefits from the faster radiation damping of heavy ions but beam losses due to collimation and ultraperipheral collisions at the interactions points will require...
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Yuri Nosochkov (SLAC National Accelerator Laboratory (US))10/04/2018, 13:50HE-LHC
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Jose Abelleira10/04/2018, 14:10HE-LHC
The HE-LHC final focus triplet must be designed for a potential flat beam operation. Flat beams can partially mitigate the effect of the crossing angle on the luminosity. This solution is interesting if the crossing angle can’t be compensated by other means, as for example, by crab-waist rotation. The flat beam parameter choice is explained here, and its luminosity evolution is compared with...
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Tatiana Pieloni (EPF Lausanne)10/04/2018, 14:30HE-LHC
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Frank Zimmermann (CERN)12/04/2018, 13:30HE-LHC
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Rogelio Tomas Garcia (CERN)12/04/2018, 13:48HE-LHC
Doubling the energy reach of the LHC by upgrading magnets with niobium-tin technology challenges optics design in several aspects. The machine layout and transverse dimensions have to fit in the existing tunnel. The larger energy swing together with features from the new niobium-tin technology deteriorate magnetic field quality, affecting both the linear and non-linear beam dynamics. A large...
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Leon Van Riesen-Haupt12/04/2018, 14:06HE-LHC
The High Energy LHC (HE-LHC) is one option for a next generation hadron collider explored in the FCC-hh programme. The core concept of the HE-LHC is to install FCC-hh technology magnets in the LHC tunnel. The higher beam rigidity and the increased radiation debris, however, impose severe challenges on the design of the triplet for the low beta insertions. In order to achieve 25 cm beta*...
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Brennan Goddard (CERN)12/04/2018, 14:24HE-LHC
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Jacqueline Keintzel (Vienna University of Technology (AT))12/04/2018, 14:42HE-LHC
Design of the HE-LHC, which will reach approximately twice the centre of mass energy of the LHC, in an already existing tunnel is challenging for optics design.
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To efficiently generate lattices with different parameters, strong effort has been put in developing an automatic lattice generation application. By focusing on two different arc options, namely 18 or 23 cells per arc, merits are... -
Jose Abelleira (JAI Oxford)12/04/2018, 15:30HE-LHC
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Matthew Paul Crouch (CERN)12/04/2018, 15:48HE-LHC
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Michael Hofer (Vienna University of Technology (AT))12/04/2018, 16:06HE-LHC
As part of the Future Circular Collider (FCC) study, a high energy upgrade of the LHC (HE-LHC) is studied. Putting this accelerator with twice the center of mass energy in the existing LHC-tunnel relies on the 16 T dipoles developed for the FCC-hh. Using recent field quality tables of these niobium-tin magnets, the dynamic aperture for different injection energies and two lattices is...
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David Amorim (CERN / Universite Grenoble-Alpes (FR))12/04/2018, 16:24HE-LHC
A first version of the HE-LHC impedance was derived from the LHC and HL-LHC impedance models. In these models, two main sources of impedance are considered: the beam screen and the collimation system. The proposed injection energies were evaluated with respect to impedance and transverse beam stability. Because of the tighter physical gaps in the collimators at top energy (13.5 TeV), the...
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Lotta Mether (EPFL - Ecole Polytechnique Federale Lausanne (CH))12/04/2018, 16:42HE-LHC