• C. Carli, M. Chanel, B. Goddard, M. Martini, D. Quatraro, M. Scholz
  CERN, Geneva
• M. Aiba
  PSI, Villigen

The performance of the CERN PS Booster (PSB) synchrotron is believed to be limited mainly by direct space charge effects at low energy. The main motivation to construct Linac4 is to raise the PSB injection energy to mitigate direct space charge effects. At present, simulation of the injection and the ow energy part of the cycle aim at defining Investigations on the influence of parameters of the injected beam on the performance of the PSB are described.

• C.T. Rogers
  STFC/RAL/ASTeC, Chilton, Didcot, Oxon
• A. Alekou
  Imperial College of Science and Technology, Department of Physics, London
• M. Martini, G. Prior
  CERN, Geneva
• D.V. Neuffer
  Fermilab, Batavia
• D. Stratakis
  BNL, Upton, Long Island, New York
• C. Y. Yoshikawa
  Muons, Inc, Batavia
• M.S. Zisman
  LBNL, Berkeley, California

We discuss alternative designs of the muon capture front end of the Neutrino Factory International Design Study (IDS). In the front end, a proton bunch on a target creates secondary pions that drift into a capture channel, decaying into muons. A sequence of RF cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. This design is affected by limitations on accelerating gradients within magnetic fields. The effects of gradient limitations are explored, and mitigation strategies are presented.

• D.V. Neuffer
  Fermilab, Batavia
• M. Martini, G. Prior
  CERN, Geneva
• C.T. Rogers
  STFC/RAL/ASTeC, Chilton, Didcot, Oxon
• C. Y. Yoshikawa
  Muons, Inc, Batavia

We discuss the design of the muon capture front end of a neutrino factory and present studies of variations of its components. In the front end, a proton bunch on a target creates secondary pions that drift into a capture transport channel, decaying into muons. A sequence of rf cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. The cooling section uses absorber material (reducing the 3-D muon momenta) alternating with rf cavities (restoring longitudinal momentum) within strong focusing magnetic fields. The design is affected by limitations on accelerating gradients within magnetic fields. The effects of gradient limitations are explored, and mitigation strategies are presented. Variations of the ionization cooling and acceleration scenarios and extensions toward use in a muon collider are discussed.

• F. Antoniou
  National Technical University of Athens, Zografou
• M. Martini, Y. Papaphilippou, A. Vivoli
  CERN, Geneva

Due to the high bunch density, the output emittances of the CLIC Damping Rings (DR) are strongly dominated by the effect of Intrabeam Scattering (IBS). In an attempt to optimize the ring design and using classical IBS formalisms and approximations, the scaling of the extracted emittances and IBS growth rates is being studied, with respect to several ring parameters including energy, bunch charge, optics and wiggler characteristics. Results from the simulations using a multi-particle tracking code are also presented.

• A. Vivoli, M. Martini
  CERN, Geneva

The CLIC 3 TeV nominal design requires very low emittance of the electron and positron beams to be reached in the damping rings. Due to low energy and to relatively high bunch charge and ultra-low emittance, Intra-Beam Scattering (IBS) effect is very strong and an accurate calculation is needed to check if the required emittance is effectively reached. For this reason it is being developed at CERN a new Software for IBS and Radiation Effects (SIRE), which simulates the evolution of the beam particle distribution in the damping rings, taking into account radiation damping, IBS and quantum excitation. In this paper we present the results of our simulations performed with SIRE on the current lattice of the CLIC damping rings.