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Title: The Higgs Factory muon collider superconducting magnets and their protection against beam decay radiation

Abstract

We report a low-energy medium-luminosity Muon Collider (MC) is being studied as a possible Higgs Factory (HF). Electrons from muon decays will deposit more than 300 kW in superconducting (SC) magnets of the HF collider ring. This imposes significant challenges to SC magnets used in the HF storage ring (SR) and interaction regions (IR). Conceptual designs of SC dipole and quadrupole magnets are described which provide high operating gradient and field in a large aperture to accommodate the large size of muon beams (due to low β*), as well as a cooling system to intercept the large heat deposition from the showers induced by decay electrons. The distribution of heat deposition in the main elements of HF SR lattice requires large-aperture magnets to accommodate thick high-Z absorbers to protect the SC coils. Based on the developed MARS15 model and intensive simulations, a sophisticated protection system from radiation was designed for the collider SR and IR to bring the peak power density in the SC coils well below the quench limit and reduce the dynamic heat deposition in the cold mass of SC magnets by a factor of 100. The radiation protection system consists of tight tungsten masks in the magnetmore » interconnect regions and elliptical tungsten liners in the magnet aperture optimized for each magnet. Lastly, these elements reduce also the background particle fluxes in the collider detector.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1462723
Report Number(s):
arXiv:1806.08883; FERMILAB-PUB-18-300-APC
Journal ID: ISSN 1748-0221; 1679447; TRN: US1902190
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 13; Journal Issue: 10; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Muon collider; superconducting magnets; MARS modelling

Citation Formats

Mokhov, N. V., Kashikhin, V. V., Striganov, S. I., Tropin, I. S., and Zlobin, A. V. The Higgs Factory muon collider superconducting magnets and their protection against beam decay radiation. United States: N. p., 2018. Web. doi:10.1088/1748-0221/13/10/P10024.
Mokhov, N. V., Kashikhin, V. V., Striganov, S. I., Tropin, I. S., & Zlobin, A. V. The Higgs Factory muon collider superconducting magnets and their protection against beam decay radiation. United States. doi:10.1088/1748-0221/13/10/P10024.
Mokhov, N. V., Kashikhin, V. V., Striganov, S. I., Tropin, I. S., and Zlobin, A. V. Fri . "The Higgs Factory muon collider superconducting magnets and their protection against beam decay radiation". United States. doi:10.1088/1748-0221/13/10/P10024. https://www.osti.gov/servlets/purl/1462723.
@article{osti_1462723,
title = {The Higgs Factory muon collider superconducting magnets and their protection against beam decay radiation},
author = {Mokhov, N. V. and Kashikhin, V. V. and Striganov, S. I. and Tropin, I. S. and Zlobin, A. V.},
abstractNote = {We report a low-energy medium-luminosity Muon Collider (MC) is being studied as a possible Higgs Factory (HF). Electrons from muon decays will deposit more than 300 kW in superconducting (SC) magnets of the HF collider ring. This imposes significant challenges to SC magnets used in the HF storage ring (SR) and interaction regions (IR). Conceptual designs of SC dipole and quadrupole magnets are described which provide high operating gradient and field in a large aperture to accommodate the large size of muon beams (due to low β*), as well as a cooling system to intercept the large heat deposition from the showers induced by decay electrons. The distribution of heat deposition in the main elements of HF SR lattice requires large-aperture magnets to accommodate thick high-Z absorbers to protect the SC coils. Based on the developed MARS15 model and intensive simulations, a sophisticated protection system from radiation was designed for the collider SR and IR to bring the peak power density in the SC coils well below the quench limit and reduce the dynamic heat deposition in the cold mass of SC magnets by a factor of 100. The radiation protection system consists of tight tungsten masks in the magnet interconnect regions and elliptical tungsten liners in the magnet aperture optimized for each magnet. Lastly, these elements reduce also the background particle fluxes in the collider detector.},
doi = {10.1088/1748-0221/13/10/P10024},
journal = {Journal of Instrumentation},
number = 10,
volume = 13,
place = {United States},
year = {2018},
month = {10}
}

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Works referenced in this record:

Research and Development of Wires and Cables for High-Field Accelerator Magnets
journal, April 2016

  • Barzi, Emanuela; Zlobin, Alexander V.
  • IEEE Transactions on Nuclear Science, Vol. 63, Issue 2
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Progress with High-Field Superconducting Magnets for High-Energy Colliders
journal, October 2015


Thermal Analysis of SC Quadrupoles in Accelerator Interaction Regions
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