• N. V. Mokhov, V. Kashikhin, M. Monville
  Fermilab, Batavia, Illinois
• P. Ferracin, G. L. Sabbi
  LBNL, Berkeley, California

At the LHC upgrade luminosity of 10³⁵ cm^-2 s^-1, collision product power in excess of a kW is deposited in the inner triplet quadrupoles. The quadrupole field sweeps secondary particles from pp-collisions into the superconducting coils, concentrating the power deposition at the magnetic mid-planes. The local peak power density can substantially exceed the conductor quench limits and reduce component lifetime. Under these conditions, block-coil geometries may result in overall improved performance by removing the superconductor from the magnetic mid-planes and/or allowing increased shielding at such locations. First realistic energy deposition simulations are performed for an interaction region based on block-coil quadrupoles with parameters suitable for the LHC upgrade. Results are presented on 3-D distributions of power density and accumulated dose in the inner triplet components as well as on dynamic heat loads on the cryogenic system. Optimization studies are performed on configuration and parameters of the beam pipe, cold bore and cooling channels. The feasibility of the proposed design is discussed.

• O. Napoly, O. Delferriere, M. Durante, J. Payet, C. Rippon, D. Uriot
  CEA, Gif-sur-Yvette
• M. Alabau, P. Bambade, J. Brossard, O. Dadoun, C. Rimbault
  LAL, Orsay
• D. A.-K. Angal-Kalinin, F. Jackson, S. I. Tzenov
  STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
• R. Appleby
  UMAN, Manchester
• B. Balhan, J. Borburgh, B. Goddard
  CERN, Geneva
• Y. Iwashita
  Kyoto ICR, Uji, Kyoto
• L. Keller
  SLAC, Menlo Park, California
• S. Kuroda
  KEK, Ibaraki
• G. L. Sabbi
  LBNL, Berkeley, California

An interaction region with head-on collisions is considered as an alternative to the baseline ILC configuration. Progress in the final focus optics design includes engineered large bore superconducting final doublet magnets and their 3D magnetic integration in the detector solenoids. Progress on the beam separation optics is based on technical designs of electrostatic separator and special extraction quadripoles. The spent beam extraction is realized by a staged collimation scheme relying on realistic collimators. The impact on the detector background is estimated. The possibility of technical tests of the most challenging components is investigated.

• G. L. Sabbi
  LBNL, Berkeley, California