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Title: Design and Fabrication of the Mu2e Cryogenic Distribution System

Abstract

The muon-to-electron conversion (Mu2e) experiment at Fermilab will be used to search for the charged lepton flavor-violating conversion of muons to electrons in the field of an atomic nucleus. The Mu2e experiment is currently in the design and construction stage and is expected to begin operations in 2022. The Mu2e experiment uses four large superconducting solenoid magnets including a Production Solenoid (PS), an Upstream and Downstream Transport Solenoid (TSu and TSd) and a Detector Solenoid (DS). This paper will focus on the cryogenic distribution system for these four solenoid magnets. Liquid helium will be supplied from two re-purposed Tevatron satellite refrigerators. A large cryogenic distribution box (DB) is located in the Mu2e building to distribute the required cryogens to each of the four solenoid magnets. Each solenoid magnet will have a dedicated transfer line and cryogenic feed box (FB). The solenoid magnets each require two liquid helium circuits and two liquid nitrogen circuits. The most unique feature about this cryogenic system is that the assemblies for the start of the superconducting portion of the power leads are mounted in feed boxes that are in the range of 23 m to 31 m away from the solenoid magnets. The cryogenic feedmore » boxes are located remotely to provide protection from radiation damage and high magnetic fields. The power leads are NbTi superconducting cable stabilized with high conductivity aluminum. The 6061-T6 aluminum grade was selected for the transfer line piping so that the piping would thermally contract at the same rate as the power lead. A major concern for this transfer line is that a small helium leak could create an electric discharge arc due to the Paschen effect. This paper includes a description of the design features and testing done to ensure that the power leads are protected from the Paschen effect while still being adequately cooled to liquid helium temperatures.« less

Authors:
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  1. Fermilab
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)
Contributing Org.:
Mu2e
OSTI Identifier:
1605573
Report Number(s):
FERMILAB-CONF-19-557-TD
oai:inspirehep.net:1787000
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Journal Name:
Adv.Croy.Eng.
Additional Journal Information:
Conference: Cryogenic Engineering Conference & International Cryogenic Materials Conference (CEC-ICMC 2019), Hartford, Connecticut, 07/21-07/25/2019
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

White, Michael, Lamm, Michael, Hocker, Andy, Arnold, Don, Tatkowski, Tatkowski,Grzegorz, Kilmer, James, Poloubotko, Valeri, Tope, Terry, Huang, Yuenian, Elementi, Luciano, Badgley, Karie, Voirin, Erik, Young, Ian, Dhanaraj, Nandhini, Brandt, Jeff, Feher, Sandor, and Hess, Charles. Design and Fabrication of the Mu2e Cryogenic Distribution System. United States: N. p., 2020. Web.
White, Michael, Lamm, Michael, Hocker, Andy, Arnold, Don, Tatkowski, Tatkowski,Grzegorz, Kilmer, James, Poloubotko, Valeri, Tope, Terry, Huang, Yuenian, Elementi, Luciano, Badgley, Karie, Voirin, Erik, Young, Ian, Dhanaraj, Nandhini, Brandt, Jeff, Feher, Sandor, & Hess, Charles. Design and Fabrication of the Mu2e Cryogenic Distribution System. United States.
White, Michael, Lamm, Michael, Hocker, Andy, Arnold, Don, Tatkowski, Tatkowski,Grzegorz, Kilmer, James, Poloubotko, Valeri, Tope, Terry, Huang, Yuenian, Elementi, Luciano, Badgley, Karie, Voirin, Erik, Young, Ian, Dhanaraj, Nandhini, Brandt, Jeff, Feher, Sandor, and Hess, Charles. Thu . "Design and Fabrication of the Mu2e Cryogenic Distribution System". United States. https://www.osti.gov/servlets/purl/1605573.
@article{osti_1605573,
title = {Design and Fabrication of the Mu2e Cryogenic Distribution System},
author = {White, Michael and Lamm, Michael and Hocker, Andy and Arnold, Don and Tatkowski, Tatkowski,Grzegorz and Kilmer, James and Poloubotko, Valeri and Tope, Terry and Huang, Yuenian and Elementi, Luciano and Badgley, Karie and Voirin, Erik and Young, Ian and Dhanaraj, Nandhini and Brandt, Jeff and Feher, Sandor and Hess, Charles},
abstractNote = {The muon-to-electron conversion (Mu2e) experiment at Fermilab will be used to search for the charged lepton flavor-violating conversion of muons to electrons in the field of an atomic nucleus. The Mu2e experiment is currently in the design and construction stage and is expected to begin operations in 2022. The Mu2e experiment uses four large superconducting solenoid magnets including a Production Solenoid (PS), an Upstream and Downstream Transport Solenoid (TSu and TSd) and a Detector Solenoid (DS). This paper will focus on the cryogenic distribution system for these four solenoid magnets. Liquid helium will be supplied from two re-purposed Tevatron satellite refrigerators. A large cryogenic distribution box (DB) is located in the Mu2e building to distribute the required cryogens to each of the four solenoid magnets. Each solenoid magnet will have a dedicated transfer line and cryogenic feed box (FB). The solenoid magnets each require two liquid helium circuits and two liquid nitrogen circuits. The most unique feature about this cryogenic system is that the assemblies for the start of the superconducting portion of the power leads are mounted in feed boxes that are in the range of 23 m to 31 m away from the solenoid magnets. The cryogenic feed boxes are located remotely to provide protection from radiation damage and high magnetic fields. The power leads are NbTi superconducting cable stabilized with high conductivity aluminum. The 6061-T6 aluminum grade was selected for the transfer line piping so that the piping would thermally contract at the same rate as the power lead. A major concern for this transfer line is that a small helium leak could create an electric discharge arc due to the Paschen effect. This paper includes a description of the design features and testing done to ensure that the power leads are protected from the Paschen effect while still being adequately cooled to liquid helium temperatures.},
doi = {},
journal = {Adv.Croy.Eng.},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {3}
}

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