Abstract

Simulation of background particle fluxes generated by colliding beams is performed with FLUKA package for the Super C-Tau factory Detector (SCTD). Two processes are considered as main sources of luminosity generated background: two-photon production of electron-positron pairs and Bha-Bha scattering with bremsstrahlung photon emission (radiative Bha-Bha). The SCTD geometry is described corresponding to the last version of the Conceptual Design Report. The magnetic field based on the calculation in ANSYS is introduced in the model. Main results of the simulation for beam energy of 3 GeV, luminosity of 1035 cm−2s−1 and 1.5 T magnetic field are the following: charged particle fluence in the region of the Inner Tracker (radius 5cm -20 cm, Z between -30cm and 30 cm) is between 105 particles/(cm2s) and ∼103 particles/(cm2s); 1-MeV neutron equivalent fluence for Si in the regions corresponding to electronics of the Inner Tracker and the Drift Chamber is below 1011 n/(cm2y) and absorbed dose is below 100 Gy/y in the hottest regions of the detector.

Highlights

  • Super C-τ factory is electron-positron collider with "Crab-Waist" collision scheme, that will operate in the energy range of 1.5 - 3 (3.5) GeV per beam, provide luminosity up to 1035 cm−2s−1 and longitudinal polarization of electrons in the interaction point [1]

  • In the region of tracking system electrons and positrons are mainly generated in the interaction point

  • Secondary particles are produced at the walls of the vacuum pipe by high energy electrons at small θ and backscattered into the cenral region of Super C-Tau factory Detector (SCTD)

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Summary

Introduction

Super C-τ factory is electron-positron collider with "Crab-Waist" collision scheme, that will operate in the energy range of 1.5 - 3 (3.5) GeV per beam, provide luminosity up to 1035 cm−2s−1 and longitudinal polarization of electrons in the interaction point [1]. Detector for Super c-τ factory (SCTD) consists of the Inner Tracker (IT), the Drift chamber (DC), the Particle identification system (PID), the Calorimeter, the Superconductive coil and the iron yoke with the Muon system. As the IT is the closest subsystem to the interaction point, the flux of background particles is an important issue that will affect the choice of IT technology. In the present work the simulations of physics background generated by the colliding beams are performed and main consequences for all the listed options of the IT are analysed as well as distributions of particle flux, radiation dose and 1-MeV neutron equivalent fluence for the whole SCTD

Simulations of background particle flux
Results of the simulations
Summary
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