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Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype

This paper discusses the simulated and experimentally observed quench behavior of the first HL-LHC Twin Aperture Orbit Corrector Prototype, also known as the MCBRDp1 magnet. This superconducting magnet features two independently powered apertures. Each aperture comprises two concentric canted-cosine...

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Autores principales: Mentink, Matthias, Duda, Michal, Mangiarotti, Franco, van Nugteren, Jeroen, Willering, Gerard, Kirby, Glyn
Lenguaje:eng
Publicado: 2020
Acceso en línea:https://dx.doi.org/10.1109/TASC.2020.2970389
http://cds.cern.ch/record/2743778
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author Mentink, Matthias
Duda, Michal
Mangiarotti, Franco
van Nugteren, Jeroen
Willering, Gerard
Kirby, Glyn
author_facet Mentink, Matthias
Duda, Michal
Mangiarotti, Franco
van Nugteren, Jeroen
Willering, Gerard
Kirby, Glyn
author_sort Mentink, Matthias
collection CERN
description This paper discusses the simulated and experimentally observed quench behavior of the first HL-LHC Twin Aperture Orbit Corrector Prototype, also known as the MCBRDp1 magnet. This superconducting magnet features two independently powered apertures. Each aperture comprises two concentric canted-cosine-theta-type Nb-Ti/Cu coils that together generate a dipolar magnetic field over the bore. These coils are held in place by conductive aluminum-alloy formers. The circuit is protected by a combination of energy extraction and quench-back in the coils. When the coils are discharged over an energy extractor, eddy currents are generated in the formers, and the resulting heat quickly and efficiently brings the Nb-Ti/Cu strands above their current sharing temperature, provided that the resistive voltage over the energy extractor is sufficiently large. This paper compares simulations and experimental observations. It is shown that with the BBQ tool, the initial voltage development after a training quench is correctly reproduced. The ProteCCT simulation tool is shown to be consistent with experimentally observed discharges of the MCBRDp1 prototype for different bath temperatures, energy extractor types, and initial operating currents. The baseline energy extractor resistor value of 1.5 Ω and the non-linear varistor option both give worst-case hotspot temperatures below the 200 K hotspot temperature limit. At ultimate current, the resulting hotspot temperatures are 143 and 167 K, and the peak voltages-to-ground are 590 and 440 V, respectively.
id oai-inspirehep.net-1825908
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
record_format invenio
spelling oai-inspirehep.net-18259082022-08-17T13:00:50Zdoi:10.1109/TASC.2020.2970389http://cds.cern.ch/record/2743778engMentink, MatthiasDuda, MichalMangiarotti, Francovan Nugteren, JeroenWillering, GerardKirby, GlynSimulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector PrototypeThis paper discusses the simulated and experimentally observed quench behavior of the first HL-LHC Twin Aperture Orbit Corrector Prototype, also known as the MCBRDp1 magnet. This superconducting magnet features two independently powered apertures. Each aperture comprises two concentric canted-cosine-theta-type Nb-Ti/Cu coils that together generate a dipolar magnetic field over the bore. These coils are held in place by conductive aluminum-alloy formers. The circuit is protected by a combination of energy extraction and quench-back in the coils. When the coils are discharged over an energy extractor, eddy currents are generated in the formers, and the resulting heat quickly and efficiently brings the Nb-Ti/Cu strands above their current sharing temperature, provided that the resistive voltage over the energy extractor is sufficiently large. This paper compares simulations and experimental observations. It is shown that with the BBQ tool, the initial voltage development after a training quench is correctly reproduced. The ProteCCT simulation tool is shown to be consistent with experimentally observed discharges of the MCBRDp1 prototype for different bath temperatures, energy extractor types, and initial operating currents. The baseline energy extractor resistor value of 1.5 Ω and the non-linear varistor option both give worst-case hotspot temperatures below the 200 K hotspot temperature limit. At ultimate current, the resulting hotspot temperatures are 143 and 167 K, and the peak voltages-to-ground are 590 and 440 V, respectively.oai:inspirehep.net:18259082020
spellingShingle Mentink, Matthias
Duda, Michal
Mangiarotti, Franco
van Nugteren, Jeroen
Willering, Gerard
Kirby, Glyn
Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype
title Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype
title_full Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype
title_fullStr Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype
title_full_unstemmed Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype
title_short Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype
title_sort simulated versus experimentally observed quench behavior of the hl-lhc twin aperture orbit corrector prototype
url https://dx.doi.org/10.1109/TASC.2020.2970389
http://cds.cern.ch/record/2743778
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