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Title: Geometric Field Errors of Short Models for MQXF, the Nb$$_{3}$$Sn low-$$\beta$$ Quadrupole for the High Luminosity LHC

Abstract

In the framework of the high-luminosity upgrade of the large hadron collider, the U.S. LARP collaboration and CERN are jointly developing a 150-mm aperture Nb$$_{3}$$Sn quadrupole for the Large Hadron Collider (LHC) interaction regions. Due to the large beam size and orbit displacement in the final focusing triplet, MQXF has challenging targets for field quality at nominal operation conditions. Three short model magnets have been tested and around 30 coils have been built, allowing a first analysis of the reproducibility of the coil size and turns positioning. The impact of the coil shimming on field quality is evaluated, with special emphasis on the warm magnetic measurements and the correlation to field measurements at cold and nominal field. The variability of the field harmonics along the magnet axis is studied by means of a Monte-Carlo analysis and the effects of the corrective actions implemented to suppress the low-order unallowed multipoles are discussed.

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [3]
  1. CERN
  2. Fermilab
  3. LBNL, Berkeley
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1508349
Report Number(s):
FERMILAB-PUB-17-373-TD
1664488
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
IEEE Trans.Appl.Supercond.
Additional Journal Information:
Journal Volume: 28; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Izquierdo Bermudez, Susana, Ambrosio, Giorgio, Bajas, Hugues, Chlachidze, Guram, Ferradas Troitino, Jose, Ferracin, Paolo, Fiscarelli, Lucio, Hagen, Per, Holik, Eddie Frank, Di Marco, Joseph, Stoynev, Stoyan Emilov, Todesco, Ezio, Sabbi, Gianluca, Vallone, Giorgio, and Wang, Xiaorong. Geometric Field Errors of Short Models for MQXF, the Nb$_{3}$Sn low-$\beta$ Quadrupole for the High Luminosity LHC. United States: N. p., 2018. Web. doi:10.1109/TASC.2018.2793240.
Izquierdo Bermudez, Susana, Ambrosio, Giorgio, Bajas, Hugues, Chlachidze, Guram, Ferradas Troitino, Jose, Ferracin, Paolo, Fiscarelli, Lucio, Hagen, Per, Holik, Eddie Frank, Di Marco, Joseph, Stoynev, Stoyan Emilov, Todesco, Ezio, Sabbi, Gianluca, Vallone, Giorgio, & Wang, Xiaorong. Geometric Field Errors of Short Models for MQXF, the Nb$_{3}$Sn low-$\beta$ Quadrupole for the High Luminosity LHC. United States. https://doi.org/10.1109/TASC.2018.2793240
Izquierdo Bermudez, Susana, Ambrosio, Giorgio, Bajas, Hugues, Chlachidze, Guram, Ferradas Troitino, Jose, Ferracin, Paolo, Fiscarelli, Lucio, Hagen, Per, Holik, Eddie Frank, Di Marco, Joseph, Stoynev, Stoyan Emilov, Todesco, Ezio, Sabbi, Gianluca, Vallone, Giorgio, and Wang, Xiaorong. 2018. "Geometric Field Errors of Short Models for MQXF, the Nb$_{3}$Sn low-$\beta$ Quadrupole for the High Luminosity LHC". United States. https://doi.org/10.1109/TASC.2018.2793240. https://www.osti.gov/servlets/purl/1508349.
@article{osti_1508349,
title = {Geometric Field Errors of Short Models for MQXF, the Nb$_{3}$Sn low-$\beta$ Quadrupole for the High Luminosity LHC},
author = {Izquierdo Bermudez, Susana and Ambrosio, Giorgio and Bajas, Hugues and Chlachidze, Guram and Ferradas Troitino, Jose and Ferracin, Paolo and Fiscarelli, Lucio and Hagen, Per and Holik, Eddie Frank and Di Marco, Joseph and Stoynev, Stoyan Emilov and Todesco, Ezio and Sabbi, Gianluca and Vallone, Giorgio and Wang, Xiaorong},
abstractNote = {In the framework of the high-luminosity upgrade of the large hadron collider, the U.S. LARP collaboration and CERN are jointly developing a 150-mm aperture Nb$_{3}$Sn quadrupole for the Large Hadron Collider (LHC) interaction regions. Due to the large beam size and orbit displacement in the final focusing triplet, MQXF has challenging targets for field quality at nominal operation conditions. Three short model magnets have been tested and around 30 coils have been built, allowing a first analysis of the reproducibility of the coil size and turns positioning. The impact of the coil shimming on field quality is evaluated, with special emphasis on the warm magnetic measurements and the correlation to field measurements at cold and nominal field. The variability of the field harmonics along the magnet axis is studied by means of a Monte-Carlo analysis and the effects of the corrective actions implemented to suppress the low-order unallowed multipoles are discussed.},
doi = {10.1109/TASC.2018.2793240},
url = {https://www.osti.gov/biblio/1508349}, journal = {IEEE Trans.Appl.Supercond.},
number = 3,
volume = 28,
place = {United States},
year = {2018},
month = {1}
}