Effect of CLIQ on training of HL-LHC quadrupole magnets

Conference · Mon Sep 11 04:00:00 EDT 2023

DOI:https://doi.org/10.2172/2006664· OSTI ID:2006664

Stoynev, S. ^[1]; Ambrosio, G. ^[1]; Amm, K. ^[2]; DiMarco, J. ^[1]; Feher, S. ^[1]; Ferracin, P. ^[3]; Marinozzi, V. ^[1]; Prestemon, S. ^[3]; Yahia, A. B. ^[2]

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1. Fermilab
2. Brookhaven
3. LBNL, Berkeley

The high-luminosity LHC upgrade requires stronger than LHC low-beta magnets to reach the luminosity goals of the project. The project is well advanced and HL-LHC quadrupole magnets are currently being commissioned in US Labs (MQXFA magnets) and CERN (MQXFB magnets). Those are the first Nb3Sn magnets to be used in any large particle accelerator. At development stages, many Nb3Sn accelerator sub-scale models showed relatively slow training and MQXFA magnets were projected to have low tens of quenches before reaching operational field. Recently it was shown that dedicated capacitor-based devices can affect Nb3Sn magnet training, and it was suggested that CLIQ, a capacitor-based device intended for quench protection, can do too. The present paper investigates effects on training induced by CLIQ, using the base fact that only half the coils in a quadrupole experience upward current modulation because of the capacitor discharge. The study encompasses all MQXFA production magnets trained at BNL to date. No other high-statistics data from identical magnets (series) with CLIQ protection exists so far. Implications and opportunities stemming from data analysis are discussed and conclusions drawn.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2006664
• Report Number(s): FERMILAB-POSTER-23-293-TD; oai:inspirehep.net:2696041
• Country of Publication: United States
• Language: English

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