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Energy density-method: An approach for a quick estimation of quench temperatures in high-field accelerator magnets

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Energy density-method : An approach for a quick estimation of quench temperatures in high-field accelerator magnets. / Salmi, Tiina; Schoerling, Daniel.

julkaisussa: IEEE Transactions on Applied Superconductivity, Vuosikerta 29, Nro 4, 06.2019.

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Salmi, Tiina ; Schoerling, Daniel. / Energy density-method : An approach for a quick estimation of quench temperatures in high-field accelerator magnets. Julkaisussa: IEEE Transactions on Applied Superconductivity. 2019 ; Vuosikerta 29, Nro 4.

Bibtex - Lataa

@article{def6ea68da4a47b0bb641cb4bb0c7c9e,
title = "Energy density-method: An approach for a quick estimation of quench temperatures in high-field accelerator magnets",
abstract = "Accelerator magnets for future particle accelerators are designed to work with as high energy densities as possible to achieve high fields and compact magnet designs. A key factor limiting the energy density is given by the protection in case of quench: If a quench occurs, the stored energy must be first absorbed by the windings, and the magnet temperature shall not exceed a given limit. In this paper, we present a back-of-the-envelope method for estimating the magnet's maximum temperature after a quench based on its stored energy. The method combines the existing concepts of MIITs, time margin, and protection delay to allow for easy and direct calculation of the hot-spot temperature. We apply the proposed method to several Nb3Sn dipole and quadrupole magnets developed for HL-LHC (High Luminosity LHC) and the FCC-hh (Future Circular Collider for hadron-hadron collisions) and compare the results to a more detailed simulation. The proposed Energy density-method is a useful tool for fast feedback in the early magnet design phase to ensure that the magnet is not impossible to protect.",
keywords = "Conductivity, Copper, Energy storage, Heating systems, Magnetic circuits, Superconducting magnets, Temperature",
author = "Tiina Salmi and Daniel Schoerling",
year = "2019",
month = "6",
doi = "10.1109/TASC.2018.2880340",
language = "English",
volume = "29",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers",
number = "4",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Energy density-method

T2 - An approach for a quick estimation of quench temperatures in high-field accelerator magnets

AU - Salmi, Tiina

AU - Schoerling, Daniel

PY - 2019/6

Y1 - 2019/6

N2 - Accelerator magnets for future particle accelerators are designed to work with as high energy densities as possible to achieve high fields and compact magnet designs. A key factor limiting the energy density is given by the protection in case of quench: If a quench occurs, the stored energy must be first absorbed by the windings, and the magnet temperature shall not exceed a given limit. In this paper, we present a back-of-the-envelope method for estimating the magnet's maximum temperature after a quench based on its stored energy. The method combines the existing concepts of MIITs, time margin, and protection delay to allow for easy and direct calculation of the hot-spot temperature. We apply the proposed method to several Nb3Sn dipole and quadrupole magnets developed for HL-LHC (High Luminosity LHC) and the FCC-hh (Future Circular Collider for hadron-hadron collisions) and compare the results to a more detailed simulation. The proposed Energy density-method is a useful tool for fast feedback in the early magnet design phase to ensure that the magnet is not impossible to protect.

AB - Accelerator magnets for future particle accelerators are designed to work with as high energy densities as possible to achieve high fields and compact magnet designs. A key factor limiting the energy density is given by the protection in case of quench: If a quench occurs, the stored energy must be first absorbed by the windings, and the magnet temperature shall not exceed a given limit. In this paper, we present a back-of-the-envelope method for estimating the magnet's maximum temperature after a quench based on its stored energy. The method combines the existing concepts of MIITs, time margin, and protection delay to allow for easy and direct calculation of the hot-spot temperature. We apply the proposed method to several Nb3Sn dipole and quadrupole magnets developed for HL-LHC (High Luminosity LHC) and the FCC-hh (Future Circular Collider for hadron-hadron collisions) and compare the results to a more detailed simulation. The proposed Energy density-method is a useful tool for fast feedback in the early magnet design phase to ensure that the magnet is not impossible to protect.

KW - Conductivity

KW - Copper

KW - Energy storage

KW - Heating systems

KW - Magnetic circuits

KW - Superconducting magnets

KW - Temperature

U2 - 10.1109/TASC.2018.2880340

DO - 10.1109/TASC.2018.2880340

M3 - Article

VL - 29

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 4

ER -