CERN Accelerating science

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1.
Analysis of the Non-Linear Fringe Effects of Large Aperture Triplets for the HL-LHC Project / Bogomyagkov, AV (BINP SB RAS, Novosibirsk, Russia) ; Levichev, EB (BINP SB RAS, Novosibirsk, Russia) ; Piminov, PA (BINP SB RAS, Novosibirsk, Russia,) ; Chanc´e, A (CEA/IRFU, Gif-sur-Yvette, France) ; Dalena, B (CEA/IRFU, Gif-sur-Yvette, France) ; Payet, J (CEA/IRFU, Gif-sur-Yvette, France,) ; De Maria, R (CERN) ; Fartoukh, S (CERN) ; Giovannozzi, M (CERN)
The HL-LHC project relies on large aperture quadrupoles which are compatible with the very large beam sizes in the inner triplets resulting from the strong reduction of beta*. As a result the beam is much more sensitive to non-linear perturbations in this region, such as those induced by the fringe fields of the low-beta quadrupoles. [...]
CERN-ACC-2013-0169.- Geneva : CERN, 2013 - 3 p. Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.2615
2.
Dynamic Aperture Performance for Different Collision Optics Scenarios for the LHC Luminosity Upgrade / De Maria, R (CERN) ; Fartoukh, S (CERN) ; Giovannozzi, M (CERN) ; Chanc´e, A (CEA/IRFU, Gif-sur-Yvette) ; Dalena, B (CEA/IRFU, Gif-sur-Yvette) ; Payet, J (CEA/IRFU, Gif-sur-Yvette) ; Resta-L´opez, J ((IFIC, Valencia),) ; Hock, KM (The University of Liverpool, Liverpool) ; Korostelev, M (The University of Liverpool, Liverpool) ; Wolski, A (The University of Liverpool, Liverpool)
The ATS [1] optics solution for the HL-LHC offers the possibility of different collision optics, with a β∗ as small as 10 cm in both transverse planes, or with a β∗ aspect ratio of up to 4 pushing β∗ to even smaller value (5 cm) in the parallel separation plane while relaxing it (20 cm) in the crossing plane. The latter configuration features two possible options for alternative orientations of the crossing plane in the two high luminosity insertions, both considered in this study. [...]
CERN-ACC-2013-0167.- Geneva : CERN, 2013 - 3 p. Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.2609

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