Beams Document 4208-v1

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Radiation Studies for Mu2e Experiment

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Alexander Sukhanov
Updated by:
Alexander Sukhanov
Document Created:
30 Aug 2012, 13:04
Contents Revised:
30 Aug 2012, 13:04
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30 Aug 2012, 13:04
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The Mu2e experiment at Fermilab is designed to study the conversion of a negative muon to electron in the field of a nucleus without emission of neutrinos. Observation of this process would provide unambiguous evidence for physics beyond the Standard Model and can help illuminate discoveries made at the LHC or point to new physics beyond its reach.
Performance of Mu2e essentially depends on how values of radiation quantities in the magnets satisfy the requirements developed so that the experimental setup withstand in the radiation environment during its lifetime. Radiation quantities such as neutron flux, DPA, power density, absorbed dose in organics, dynamic heat load in cryogenics will be discussed.
Shielding of the magnets in Mu2e solenoids will be described along with how they comply with constraints such as quench stability, low dynamic heat loads, lifetime of the components. An account of Production Solenoid absorber (Heat and Radiation Shield) design based on thorough MARS15 simulations will be sketched from first multilayer options to the present all-bronze one.
Another important issue is the neutron flux arising from both primary proton interactions and interactions of muons with parts of Mu2e apparatus. These neutrons can create a high background in Cosmic Ray Veto counters. Calculations of neutron flux in the counters for different configurations of shielding around the Detector Solenoid were performed using MARS15 code and will be presented.
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