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Title: Fabrication and analysis of 150-mm-Aperture Nb3Sn MQXF coils

Abstract

The U.S. LHC Accelerator Research Program (LARP) and CERN are combining efforts for the HiLumi-LHC upgrade to design and fabricate 150-mm-aperture interaction region quadrupoles with a nominal gradient of 130 T/m using Nb3Sn. To successfully produce the necessary long MQXF triplets, the HiLumi-LHC collaboration is systematically reducing risk and design modification by heavily relying upon the experience gained from the successful 120-mm-aperture LARP HQ program. First-generation MQXF short (MQXFS) coils were predominately a scaling up of the HQ quadrupole design, allowing comparable cable expansion during Nb3Sn formation heat treatment and increased insulation fraction for electrical robustness. A total of 13 first-generation MQXFS coils were fabricated between LARP and CERN. Systematic differences in coil size, coil alignment symmetry, and coil length contraction during heat treatment are observed and likely due to slight variances in tooling and insulation/cable systems. Analysis of coil cross sections indicate that field-shaping wedges and adjacent coil turns are systematically displaced from the nominal location and the cable is expanding less than nominally designed. A second-generation MQXF coil design seeks to correct the expansion and displacement discrepancies by increasing insulation and adding adjustable shims at the coil pole and midplanes to correct allowed magnetic field harmonics.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [3];  [2];  [4];  [2];  [1];  [1];  [2];  [3];  [2];  [3];  [4];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
LARP
OSTI Identifier:
1288734
Alternate Identifier(s):
OSTI ID: 1245372; OSTI ID: 1456943
Report Number(s):
FERMILAB-PUB-15-358-TD; BNL-111686-2015-JA
Journal ID: ISSN 1051-8223; 1409684
Grant/Contract Number:  
AC02-07CH11359; SC00112704; AC02-05CH11231; AC02-07CH11259; AC02-98CH10886
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 26; 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; Nb3Sn magnet; superconducting accelerator magnets; low-beta quadrupole; high luminosity LHC; coils; superconducting cables; superconducting magnets; cable insulation; niobium-tin; apertures; NB₃Sn Magnet; High Luminosity LHC

Citation Formats

Holik, Eddie Frank, Ambrosio, Giorgio, Anerella, Michael, Bossert, Rodger, Cavanna, Eugenio, Cheng, Daniel, Dietderich, Daniel R., Ferracin, Paolo, Ghosh, Arup K., Izquierdo Bermudez, Susana, Krave, Steven, Nobrega, Alfred, Perez, Juan C., Pong, I., Rochepault, Etienne, Sabbi, Gian Luca, Schmalzle, Jesse, and Yu, Miao. Fabrication and analysis of 150-mm-Aperture Nb3Sn MQXF coils. United States: N. p., 2016. Web. doi:10.1109/TASC.2015.2514193.
Holik, Eddie Frank, Ambrosio, Giorgio, Anerella, Michael, Bossert, Rodger, Cavanna, Eugenio, Cheng, Daniel, Dietderich, Daniel R., Ferracin, Paolo, Ghosh, Arup K., Izquierdo Bermudez, Susana, Krave, Steven, Nobrega, Alfred, Perez, Juan C., Pong, I., Rochepault, Etienne, Sabbi, Gian Luca, Schmalzle, Jesse, & Yu, Miao. Fabrication and analysis of 150-mm-Aperture Nb3Sn MQXF coils. United States. https://doi.org/10.1109/TASC.2015.2514193
Holik, Eddie Frank, Ambrosio, Giorgio, Anerella, Michael, Bossert, Rodger, Cavanna, Eugenio, Cheng, Daniel, Dietderich, Daniel R., Ferracin, Paolo, Ghosh, Arup K., Izquierdo Bermudez, Susana, Krave, Steven, Nobrega, Alfred, Perez, Juan C., Pong, I., Rochepault, Etienne, Sabbi, Gian Luca, Schmalzle, Jesse, and Yu, Miao. Wed . "Fabrication and analysis of 150-mm-Aperture Nb3Sn MQXF coils". United States. https://doi.org/10.1109/TASC.2015.2514193. https://www.osti.gov/servlets/purl/1288734.
@article{osti_1288734,
title = {Fabrication and analysis of 150-mm-Aperture Nb3Sn MQXF coils},
author = {Holik, Eddie Frank and Ambrosio, Giorgio and Anerella, Michael and Bossert, Rodger and Cavanna, Eugenio and Cheng, Daniel and Dietderich, Daniel R. and Ferracin, Paolo and Ghosh, Arup K. and Izquierdo Bermudez, Susana and Krave, Steven and Nobrega, Alfred and Perez, Juan C. and Pong, I. and Rochepault, Etienne and Sabbi, Gian Luca and Schmalzle, Jesse and Yu, Miao},
abstractNote = {The U.S. LHC Accelerator Research Program (LARP) and CERN are combining efforts for the HiLumi-LHC upgrade to design and fabricate 150-mm-aperture interaction region quadrupoles with a nominal gradient of 130 T/m using Nb3Sn. To successfully produce the necessary long MQXF triplets, the HiLumi-LHC collaboration is systematically reducing risk and design modification by heavily relying upon the experience gained from the successful 120-mm-aperture LARP HQ program. First-generation MQXF short (MQXFS) coils were predominately a scaling up of the HQ quadrupole design, allowing comparable cable expansion during Nb3Sn formation heat treatment and increased insulation fraction for electrical robustness. A total of 13 first-generation MQXFS coils were fabricated between LARP and CERN. Systematic differences in coil size, coil alignment symmetry, and coil length contraction during heat treatment are observed and likely due to slight variances in tooling and insulation/cable systems. Analysis of coil cross sections indicate that field-shaping wedges and adjacent coil turns are systematically displaced from the nominal location and the cable is expanding less than nominally designed. A second-generation MQXF coil design seeks to correct the expansion and displacement discrepancies by increasing insulation and adding adjustable shims at the coil pole and midplanes to correct allowed magnetic field harmonics.},
doi = {10.1109/TASC.2015.2514193},
journal = {IEEE Transactions on Applied Superconductivity},
number = 4,
volume = 26,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}

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