Author: Milardi, C.
Paper Title Page
TUPFI023 Optics Design and Lattice Optimisation for the HL-LHC 1385
  • B.J. Holzer, R. De Maria, S.D. Fartoukh
    CERN, Geneva, Switzerland
  • R. Appleby, S. Kelly, M.B. Thomas, L.N.S. Thompson
    UMAN, Manchester, United Kingdom
  • A.V. Bogomyagkov
    BINP SB RAS, Novosibirsk, Russia
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • B. Dalena
    CEA/IRFU, Gif-sur-Yvette, France
  • A. Faus-Golfe, J. Resta
    IFIC, Valencia, Spain
  • K.M. Hock, M. Korostelev, L.N.S. Thompson, A. Wolski
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C. Milardi
    INFN/LNF, Frascati (Roma), Italy
  • J. Payet
    CEA/DSM/IRFU, France
  • A. Wolski
    The University of Liverpool, Liverpool, United Kingdom
  Funding: The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Cap. Spec. Progr, Grant Agreement 284404.
The luminosity upgrade project of the LHC collider at CERN is based on a strong focusing scheme to reach smallest beam sizes at the collision points. Depending on the available magnet technology (Nb3Sn or NbTi) a number of beam optics has been developed to define the specifications for the new super conducting quadrupoles. In the context of the optics matching new issues have been addressed and new concepts have been used: Quadrupole strength flexibility and chromatic corrections have been studied, as well as the influence of quadrupole fringe fields. The lattice has been optimised including the needs of the foreseen crab cavities and the transition between injection and low β optics had to guarantee smooth gradient changes over a wide range of β* values. Tolerances on misalignments and power converter ripple have been re-evaluated. Finally the combination of the quadrupole strengths in the high luminosity matching sections with those in the neighboring sectors is explained, a key concept of the ATS to reach smallest β* values. This paper presents the results obtained within the HiLumi collaboration Task 2.2 and summarises the main parameters of the project.
TUPFI044 LHC Optics with Crab-waist Collisions and Local Chromatic Correction 1448
  • J.L. Abelleira, S. Russenschuck, F. Zimmermann
    CERN, Geneva, Switzerland
  • C. Milardi, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579.
We report the status of the optics design for a local chromatic correction with extremely-flat beams at the LHC. Together with a Large Piwinski angle, this optics opens up the possibility of crab-waist collisions at the LHC, for which a new layout of the LHC insertion region (IR) is needed. We present a complete optics and discuss the parameters of the final "double-half" quadrupole.