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Title: Characterization of NbTi busbar for HL LHC Interaction Region Quadrupoles

Abstract

The US Accelerator Upgrade for the HiLumi-LHC (US-HL-LHC AUP) project and CERN are designing and fabricating superconducting quadrupole magnets for the interaction regions of the High Luminosity Large Hadron Collider (HLLHC). The triplet is made of three optical elements: Q1, Q2, and Q3. The Nb3Sn quadrupole magnets operate in superfluid He at 1.9 K with a nominal field gradient of 132.6 T/m. The three inner triplet elements are connected together with superconducting buses. The design and fabrication of the through and local buses is carried out at Applied Physics and Superconducting Technology Division (APS-TD) at Fermilab (FNAL). This paper reports the characterization of the bus-bar thermoelectric properties. The bus was tested with a short Nb3Sn magnet (MQXFS1e) in the vertical test facility of the APS-TD at FNAL. The test demonstrated that the bus design is adequate since no spontaneous quench took place up to 17.87 kA current value. Quench propagation velocities were investigated over a range of currents that is typical for accelerator superconducting magnets. Temperature margins were found above that required for the Hi- Lumi triplet bus. The design guarantees the protection of the bus at operational current value according to the quench detection voltage threshold (100 mV) establishedmore » for the Hi-Lumi LHC interaction region.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Fermilab Center for Particle Astrophysics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1602986
Report Number(s):
FERMILAB-PUB-20-066-TD
Journal ID: ISSN 1051-8223; oai:inspirehep.net:1783521; TRN: US2104057
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 30; Journal Issue: 4; Journal ID: ISSN 1051-8223
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Accelerator; superconducting magnet; quench protection; busbar

Citation Formats

Baldini, M., Ambrosio, G., Bossert, R. C., Chlachidze, G., Feher, S., Marinozzi, Marinozzi,. V., Orris, D. F., Pan, H., and Stoynev, S. Characterization of NbTi busbar for HL LHC Interaction Region Quadrupoles. United States: N. p., 2020. Web. doi:10.1109/TASC.2020.2976950.
Baldini, M., Ambrosio, G., Bossert, R. C., Chlachidze, G., Feher, S., Marinozzi, Marinozzi,. V., Orris, D. F., Pan, H., & Stoynev, S. Characterization of NbTi busbar for HL LHC Interaction Region Quadrupoles. United States. https://doi.org/10.1109/TASC.2020.2976950
Baldini, M., Ambrosio, G., Bossert, R. C., Chlachidze, G., Feher, S., Marinozzi, Marinozzi,. V., Orris, D. F., Pan, H., and Stoynev, S. 2020. "Characterization of NbTi busbar for HL LHC Interaction Region Quadrupoles". United States. https://doi.org/10.1109/TASC.2020.2976950. https://www.osti.gov/servlets/purl/1602986.
@article{osti_1602986,
title = {Characterization of NbTi busbar for HL LHC Interaction Region Quadrupoles},
author = {Baldini, M. and Ambrosio, G. and Bossert, R. C. and Chlachidze, G. and Feher, S. and Marinozzi, Marinozzi,. V. and Orris, D. F. and Pan, H. and Stoynev, S.},
abstractNote = {The US Accelerator Upgrade for the HiLumi-LHC (US-HL-LHC AUP) project and CERN are designing and fabricating superconducting quadrupole magnets for the interaction regions of the High Luminosity Large Hadron Collider (HLLHC). The triplet is made of three optical elements: Q1, Q2, and Q3. The Nb3Sn quadrupole magnets operate in superfluid He at 1.9 K with a nominal field gradient of 132.6 T/m. The three inner triplet elements are connected together with superconducting buses. The design and fabrication of the through and local buses is carried out at Applied Physics and Superconducting Technology Division (APS-TD) at Fermilab (FNAL). This paper reports the characterization of the bus-bar thermoelectric properties. The bus was tested with a short Nb3Sn magnet (MQXFS1e) in the vertical test facility of the APS-TD at FNAL. The test demonstrated that the bus design is adequate since no spontaneous quench took place up to 17.87 kA current value. Quench propagation velocities were investigated over a range of currents that is typical for accelerator superconducting magnets. Temperature margins were found above that required for the Hi- Lumi triplet bus. The design guarantees the protection of the bus at operational current value according to the quench detection voltage threshold (100 mV) established for the Hi-Lumi LHC interaction region.},
doi = {10.1109/TASC.2020.2976950},
url = {https://www.osti.gov/biblio/1602986}, journal = {IEEE Transactions on Applied Superconductivity},
issn = {1051-8223},
number = 4,
volume = 30,
place = {United States},
year = {2020},
month = {1}
}