CLIQ Protection Design for the Graded Nb3Sn Research Racetrack Dipole Demonstrator (R2D2)

Dong Liu; Tiina Salmi; Valerio Calvelli; Etienne Rochepault

doi:10.1109/TASC.2023.3247983

CLIQ Protection Design for the Graded Nb₃Sn Research Racetrack Dipole Demonstrator (R2D2)

Dong Liu, Tiina Salmi, Valerio Calvelli, Etienne Rochepault

Electrical Engineering

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

The Research Racetrack Dipole Demonstrator (R2D2) is being studied as a demonstrating magnet for future FCC magnets. The R2D2 is meant to prove the feasibility of grading in block-coil Nb3Sn dipoles and explore quench behaviors at a very high current. This short model provides an opportunity to study quench protection concepts which will be needed for the full-scale FCC magnets. Both quench heaters and CLIQ (coupling loss induced quench) are under study. This paper presents the research work on the CLIQ protection. The work includes CLIQ design methods and configurations, and comparative studies of various CLIQ configurations for maximizing the CLIQ effectiveness. The results show that the most effective CLIQ configuration is able to quench 80% of the coil turns at the nominal current within 3 ms, leaving 20 ms for detection and validation time while keeping the maximum hotspot temperature within 350 K. The study shows that protection of R2D2 using only CLIQ may be feasible under certain assumptions.

Original language	English
Article number	4701105
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	33
Issue number	5
DOIs	https://doi.org/10.1109/TASC.2023.3247983
Publication status	Published - 2023
Publication type	A1 Journal article-refereed

Keywords

Accelerator magnet
Capacitance
CLIQ
FCC
Hafnium
Land surface temperature
Magnetic flux
Magnetic separation
Nb <inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX">$_{3}$</tex-math> </inline-formula> Sn
quench protection
R2D2
Superconducting magnets
Voltage

Publication forum classification

Publication forum level 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/TASC.2023.3247983

Cite this

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title = "CLIQ Protection Design for the Graded Nb3Sn Research Racetrack Dipole Demonstrator (R2D2)",

abstract = "The Research Racetrack Dipole Demonstrator (R2D2) is being studied as a demonstrating magnet for future FCC magnets. The R2D2 is meant to prove the feasibility of grading in block-coil Nb3Sn dipoles and explore quench behaviors at a very high current. This short model provides an opportunity to study quench protection concepts which will be needed for the full-scale FCC magnets. Both quench heaters and CLIQ (coupling loss induced quench) are under study. This paper presents the research work on the CLIQ protection. The work includes CLIQ design methods and configurations, and comparative studies of various CLIQ configurations for maximizing the CLIQ effectiveness. The results show that the most effective CLIQ configuration is able to quench 80% of the coil turns at the nominal current within 3 ms, leaving 20 ms for detection and validation time while keeping the maximum hotspot temperature within 350 K. The study shows that protection of R2D2 using only CLIQ may be feasible under certain assumptions.",

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author = "Dong Liu and Tiina Salmi and Valerio Calvelli and Etienne Rochepault",

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doi = "10.1109/TASC.2023.3247983",

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AB - The Research Racetrack Dipole Demonstrator (R2D2) is being studied as a demonstrating magnet for future FCC magnets. The R2D2 is meant to prove the feasibility of grading in block-coil Nb3Sn dipoles and explore quench behaviors at a very high current. This short model provides an opportunity to study quench protection concepts which will be needed for the full-scale FCC magnets. Both quench heaters and CLIQ (coupling loss induced quench) are under study. This paper presents the research work on the CLIQ protection. The work includes CLIQ design methods and configurations, and comparative studies of various CLIQ configurations for maximizing the CLIQ effectiveness. The results show that the most effective CLIQ configuration is able to quench 80% of the coil turns at the nominal current within 3 ms, leaving 20 ms for detection and validation time while keeping the maximum hotspot temperature within 350 K. The study shows that protection of R2D2 using only CLIQ may be feasible under certain assumptions.

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