Simulation of Backgrounds in Detectors and Energy Deposition in Superconducting Magnets at + Colliders

A calculational approach is described to study beam induced radiation effects in detector and storage ring components at high-energy high-luminosity + colliders. The details of the corresponding physics process simulations used in the MARS code are given. Contributions of electromagnetic showers, synchrotron radiation, hadrons and daughter muons to the background rates in a generic detector for a 2 2 TeV + collider are investigated. Four configurations of the inner triplet and a detector are examined for two sources: muon decays and beam halo interactions in the lattice elements. The beam induced power density in superconducting magnets is calculated and ways to reduce it are proposed. INTRODUCTION Recent studies on a high-energy high-luminosity + collider [1, 2] have shown the high physics potential and a feasibility of such a project. A candidate design for 2 2 TeV machine, based on the existing and near-term technology, with a luminosity as high as 1035 cm 2 s 1 is described in [3]. The two most serious beamrelated problems envisioned on the way to the practical realization of a storage ring are enormous particle background levels in a detector and a high power density in the superconducting magnets [4, 5, 6] due to unavoidable muon decays and beam halo interactions. With 2 1012 muons in a bunch at 2 TeV one has 2 105 decays per meter in a single pass through an interaction region (IR), or 6 109 decays per meter per second. Decay electrons with an energy of about 700 GeV and the enormous number of synchrotron photons emitted by these electrons in a strong magnetic field induce electromagnetic showers in the collider and detector components resulting in high Work supported by the U. S. Department of Energy under contract No. DE-AC02-76CH03000.