## Quench absorption coils: A quench protection concept for high-field superconducting accelerator magnets

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**Quench absorption coils : A quench protection concept for high-field superconducting accelerator magnets.** / Mentink, M.; Salmi, T.

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*Superconductor Science and Technology*, Vuosikerta. 30, Nro 6, 064002. https://doi.org/10.1088/1361-6668/aa6678

### APA

*Superconductor Science and Technology*,

*30*(6), [064002]. https://doi.org/10.1088/1361-6668/aa6678

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### Bibtex - Lataa

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TY - JOUR

T1 - Quench absorption coils

T2 - A quench protection concept for high-field superconducting accelerator magnets

AU - Mentink, M.

AU - Salmi, T

PY - 2017/5/3

Y1 - 2017/5/3

N2 - A quench protection concept based on coupled secondary coils is studied for inductively transferring energy out of a quenching superconducting dipole and thus limiting the peak hotspot temperature. So-called 'quench absorption coils' are placed in close proximity to the superconducting coils and are connected in series with a diode for the purpose of preventing current transformation during regular operation. During a quench, current is then transformed into the quench absorption coils so that a significant fraction of the stored magnetic energy is dissipated in the these coils. Numerical calculations are performed to determine the impact of such a concept and to evaluate the dimensions of the quench absorption coils needed to obtain significant benefits. A previously constructed 15 T Nb3Sn block coil is taken as a reference layout. Finite-element calculations are used to determine the combined inductive and thermal response of this system and these calculations are validated with a numerical model using an adiabatic approximation. The calculation results indicate that during a quench the presence of the quench absorption coils reduces the energy dissipated in the superconducting coils by 45% and reduces the hotspot temperature by over 100 K. In addition, the peak resistive voltage over the superconducting coils is significantly reduced. This suggests that this concept may prove useful for magnet designs in which the hotspot temperature is a design driver.

AB - A quench protection concept based on coupled secondary coils is studied for inductively transferring energy out of a quenching superconducting dipole and thus limiting the peak hotspot temperature. So-called 'quench absorption coils' are placed in close proximity to the superconducting coils and are connected in series with a diode for the purpose of preventing current transformation during regular operation. During a quench, current is then transformed into the quench absorption coils so that a significant fraction of the stored magnetic energy is dissipated in the these coils. Numerical calculations are performed to determine the impact of such a concept and to evaluate the dimensions of the quench absorption coils needed to obtain significant benefits. A previously constructed 15 T Nb3Sn block coil is taken as a reference layout. Finite-element calculations are used to determine the combined inductive and thermal response of this system and these calculations are validated with a numerical model using an adiabatic approximation. The calculation results indicate that during a quench the presence of the quench absorption coils reduces the energy dissipated in the superconducting coils by 45% and reduces the hotspot temperature by over 100 K. In addition, the peak resistive voltage over the superconducting coils is significantly reduced. This suggests that this concept may prove useful for magnet designs in which the hotspot temperature is a design driver.

KW - accelerator magnets

KW - coupled secondary coil

KW - quench protection

KW - superconductivity

U2 - 10.1088/1361-6668/aa6678

DO - 10.1088/1361-6668/aa6678

M3 - Article

VL - 30

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

IS - 6

M1 - 064002

ER -