Quench Measurement on SIS100 Dipole Model

Floch, E.; Walter, F.; Stafiniak, Andrzej; Marzouki, F.; Schroeder, C.; Leibrock, H.; Fischer, E.; Moritz, G.

doi:10.1109/tasc.2009.2019061

Cited by 2 publications

(1 citation statement)

References 3 publications

(4 reference statements)

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“…Magnet geometry is not taken into account when computing MIITs, thus, MIITs concept has been used for many conceptual protection studies for LTS accelerator magnets [3], [5], [9]. This concept is especially useful, when large fraction of the magnet is quenched with quench protection heaters and the heat conduction in the magnet has limited effect on the hot spot temperature.…”

Section: Introductionmentioning

confidence: 99%

Hot Spot Temperature in an HTS Coil: Simulations With MIITs and Finite Element Method

Haro

Stenvall

Nugteren

et al. 2015

IEEE Trans. Appl. Supercond.

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Abstract-MIITs, a zero-dimensional concept to study hot spot temperature, has been previously used to estimate hot spot temperatures and quench heater delays in NbTi and Nb3Sn magnets. However, quench behaviour is completely different in high temperature superconducting (HTS) magnets due to the slow normal zone propagation velocity and high temperature margin. Because MIITs concept does not take into account thermal diffusion in the magnet, opposite to the finite element method (FEM) analysis, the difference of these concepts is studied in this paper. Here we have taken the approach to compute the hot spot temperatures for a future HTS magnet, designed to be built from REBCO Roebel cable, with MIITs and FEM simulations. The magnet protection is accomplished with a dump resistor, and the effect of quench detection threshold voltage on the hot spot temperature has been studied. Furthermore, the inductance of the magnet increases with the magnet length. Thus, there exists a maximum inductance of the magnet which should not be exceeded to be able to protect the magnet only with a dump resistor. The hot spot temperatures with different values of inductance are also studied in this paper. Our simulations show, that the hot spot temperatures computed with MIITs are from 60 K to 150 K higher than those of FEM analysis. Thus, MIITs concept seems unreliable when considering hot spot temperatures in HTS magnets protected with only dump resistors. However, MIITs concept might be a usable tool when comparing different magnet designs. If 400 K is the upper limit for the hot spot temperature and the protection scheme includes only a dump resistor, the length of the investigated magnet can be increased to only such value that the magnet inductance is at most 50 mH.

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Section: Introductionmentioning

confidence: 99%