• D. Greenwald, A. Caldwell
  MPI-P, München
• Y. Bao
  IHEP Beijing, Beijing

Simulations of frictional cooling for a muon collider front end scheme show that it is a viable technique for quickly producing colliding beams. The Frictional Cooling Demonstration experiment at the Max Planck Institute for Physics, Munich, aims to demonstrate the working principle of frictional cooling on protons using a 10-cm-long cooling cell. The experiment is nearing the final data taking stages. The status of the experiment is presented along with recent data. Simulation of the experiment setup is also presented.

• D. Greenwald, A. Caldwell
  MPI-P, München
• Y. Bao
  IHEP Beijing, Beijing

Muon colliders would open new frontiers of investigation in high energy particle physics, allowing precision measurements to be made at the TeV energy frontier. One of the greatest challenges to constructing a muon collider is the cooling of a beam of muons on a timescale comparable to the lifetime of the muon. Frictional cooling holds promise for use in a muon collider scheme. By balancing energy loss to a gas with energy gain from an electric field, a beam of muons is brought to an equilibrium energy in 100s of nanoseconds. A frictional cooling scheme for producing high-luminosity beams for a muon collider is presented.

• B.J. Holzer, S. Bettoni, O.S. Brüning, S. Russenschuck
  CERN, Geneva
• R. Appleby
  UMAN, Manchester
• J.B. Dainton, L.N.S. Thompson
  Cockcroft Institute, Warrington, Cheshire
• M. Klein
  The University of Liverpool, Liverpool
• A. Kling, B. Nagorny, U. Schneekloth
  DESY, Hamburg
• P. Kostka
  DESY Zeuthen, Zeuthen
• A. Polini
  INFN-Bologna, Bologna

The LHeC aims at colliding hadron-lepton beams with center of mass energies in the TeV scale. For this purpose the existing LHC storage ring is extended by a high energy electron accelerator in the energy range of 60 to 140 GeV. The electron beam will be accelerated and stored in a LEP like storage ring in the LHC tunnel. In this paper we present the layout of the interaction region which has to deliver at the same time well matched beam optics and an efficient separation of the electron and proton beams. In general the large momentum difference of the two colliding beams provides a very elegant way to solve this problem: A focusing scheme that leads to the required beam sizes of the electrons and protons is combined with an early but gentle beam separation to avoid parasitic beam encounters and still keep the synchrotron radiation level in the IR within reasonable limits. We present in this paper two versions of this concept: A high luminosity layout where the mini beta magnets are embedded into the detector design as well as an IR design that is optimised for maximum acceptance of the particle detector.