Analysis of Field Errors for LARP Nb$_3$ Sn HQ03 Quadrupole Magnet

Wang, Xiaorong; Ambrosio, Giorgio; Chlachidze, Guram; DiMarco, Joseph; Ghosh, Arup K.; Holik, Eddie Frank; Prestemon, Soren O.; Sabbi, GianLuca; Stoynev, Stoyan Emilov

doi:10.1109/TASC.2016.2633995

Title: Analysis of Field Errors for LARP Nb$$_3$$ Sn HQ03 Quadrupole Magnet

Abstract

The U.S. LHC Accelerator Research Program, in close collaboration with CERN, has developed three generations of high-gradient quadrupole (HQ) Nb₃Sn model magnets, to support the development of the 150 mm aperture Nb₃Sn quadrupole magnets for the High-Luminosity LHC. The latest generation, HQ03, featured coils with better uniformity of coil dimensions and properties than the earlier generations. We tested the HQ03 magnet at FNAL, including the field quality study. The profiles of low-order harmonics along the magnet aperture observed at 15 kA, 1.9 K can be traced back to the assembled coil pack before the magnet assembly. Based on the measured harmonics in the magnet center region, the coil block positioning tolerance was analyzed and compared with earlier HQ01 and HQ02 magnets to correlate with coil and magnet fabrication. Our study the capability of correcting the low-order non-allowed field errors, magnetic shims were installed in HQ03. Furthermore, the expected shim contribution agreed well with the calculation. For the persistent-current effect, the measured a4 can be related to 4% higher in the strand magnetization of one coil with respect to the other three coils. Lastly, we compare the field errors due to the inter-strand coupling currents between HQ03 and HQ02.

Authors:

Wang, Xiaorong ^[1]; Ambrosio, Giorgio ^[2]; Chlachidze, Guram ^[2]; DiMarco, Joseph ^[2]; Ghosh, Arup K. ^[3]; Holik, Eddie Frank ^[2]; Prestemon, Soren O. ^[1]; Sabbi, GianLuca ^[1]; Stoynev, Stoyan Emilov ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Thu Jun 01 00:00:00 EDT 2017

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:: 1563935

Alternate Identifier(s):: OSTI ID: 1336408

Report Number(s):: FERMILAB-PUB-16-564-TD
Journal ID: ISSN 1051-8223; ark:/13030/qt9105t88b; TRN: US2000788

Grant/Contract Number:: AC02-05CH11231; AC02-07CH11359

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 27; 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; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; LARP; Nb3Sn quadrupole magnets; field quality

Citation Formats


                    Wang, Xiaorong, Ambrosio, Giorgio, Chlachidze, Guram, DiMarco, Joseph, Ghosh, Arup K., Holik, Eddie Frank, Prestemon, Soren O., Sabbi, GianLuca, and Stoynev, Stoyan Emilov. Analysis of Field Errors for LARP Nb$_3$ Sn HQ03 Quadrupole Magnet.  United States: N. p., 2017. 
Web.  doi:10.1109/TASC.2016.2633995.

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                    Wang, Xiaorong, Ambrosio, Giorgio, Chlachidze, Guram, DiMarco, Joseph, Ghosh, Arup K., Holik, Eddie Frank, Prestemon, Soren O., Sabbi, GianLuca, & Stoynev, Stoyan Emilov. Analysis of Field Errors for LARP Nb$_3$ Sn HQ03 Quadrupole Magnet.  United States.  https://doi.org/10.1109/TASC.2016.2633995

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                    Wang, Xiaorong, Ambrosio, Giorgio, Chlachidze, Guram, DiMarco, Joseph, Ghosh, Arup K., Holik, Eddie Frank, Prestemon, Soren O., Sabbi, GianLuca, and Stoynev, Stoyan Emilov. Thu .  
"Analysis of Field Errors for LARP Nb$_3$ Sn HQ03 Quadrupole Magnet".  United States.  https://doi.org/10.1109/TASC.2016.2633995.  https://www.osti.gov/servlets/purl/1563935.

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@article{osti_1563935,

  title        = {Analysis of Field Errors for LARP Nb$_3$ Sn HQ03 Quadrupole Magnet},

  author       = {Wang, Xiaorong and Ambrosio, Giorgio and Chlachidze, Guram and DiMarco, Joseph and Ghosh, Arup K. and Holik, Eddie Frank and Prestemon, Soren O. and Sabbi, GianLuca and Stoynev, Stoyan Emilov},

  abstractNote = {The U.S. LHC Accelerator Research Program, in close collaboration with CERN, has developed three generations of high-gradient quadrupole (HQ) Nb3Sn model magnets, to support the development of the 150 mm aperture Nb3Sn quadrupole magnets for the High-Luminosity LHC. The latest generation, HQ03, featured coils with better uniformity of coil dimensions and properties than the earlier generations. We tested the HQ03 magnet at FNAL, including the field quality study. The profiles of low-order harmonics along the magnet aperture observed at 15 kA, 1.9 K can be traced back to the assembled coil pack before the magnet assembly. Based on the measured harmonics in the magnet center region, the coil block positioning tolerance was analyzed and compared with earlier HQ01 and HQ02 magnets to correlate with coil and magnet fabrication. Our study the capability of correcting the low-order non-allowed field errors, magnetic shims were installed in HQ03. Furthermore, the expected shim contribution agreed well with the calculation. For the persistent-current effect, the measured a4 can be related to 4% higher in the strand magnetization of one coil with respect to the other three coils. Lastly, we compare the field errors due to the inter-strand coupling currents between HQ03 and HQ02.},

  doi          = {10.1109/TASC.2016.2633995},

  journal      = {IEEE Transactions on Applied Superconductivity},

  number       = 4,

  volume       = 27,

  place        = {United States},

  year         = {Thu Jun 01 00:00:00 EDT 2017},

  month        = {Thu Jun 01 00:00:00 EDT 2017}

}

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Figures / Tables:

Fig. 1: The coordinate system for HQ, viewed from the lead end. Each quadrant contains one magnet coil. HQ03 had coils 26, 24, 23, 22 from quadrant 1 to 4. Positive current follows the positive $z$ axis toward the reader (“P” for positive and “N” for negative).

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