Minimum Quench Energy and Early Quench Development in NbTi Superconducting Strands

Breschi, Marco; Trevisani, Luca; Boselli, Marco; Bottura, L.; Devred, A.; Ribani, Pier Luigi; Trillaud, F.

doi:10.1109/tasc.2007.898373

Cited by 18 publications

(21 citation statements)

References 7 publications

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“…Once the saturation temperature is reached, the He enters the nucleate boiling phase, described by a Kapitza heat transfer coefficient as defined in [13], [14]: (8) where the parameters and assume the values of and 2.8 respectively, which allow the best fit of the experimental results in [14].…”

Section: Heat Transfer To Heliummentioning

confidence: 99%

“…If one of these thresholds is overcome the nucleate boiling phase cannot evacuate anymore heat without forming a film boiling [13], so energy starts accumulating into the He. This energy is integrated starting from the instant when equals , and compared with the total energy flux needed to form film boiling [14]: (9) where is the onset time of film boiling, and . When equals the transition to film boiling occurs and consequently the heat transfer coefficient drops to its film boiling value .…”

Section: Heat Transfer To Heliummentioning

confidence: 99%

“…It is taken equal to a constant value of , according to the most of the literature [4]- [6], [13]- [15]. This energetic criterion also takes into account the case of variable heat fluxes, and the very good agreement obtained with experimental results [14] confirms its reliability. This criterion, developed for a He bath, is adapted to the case of narrow channels considering the measured reduction of critical heat flux with reducing the channel width [15].…”

Section: Heat Transfer To Heliummentioning

confidence: 99%

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Stability Analysis of the LHC Cables for Transient Heat Depositions

Granieri

Calvi²,

Xydi

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-The commissioning and the exploitation of the LHC require a good knowledge of the stability margins of the superconducting magnets with respect to beam induced heat depositions. Previous studies showed that simple numerical models are suitable to carry out stability calculations of multi-strands cables, and highlighted the relevance of the heat transfer model with the surrounding helium. In this paper we present a systematic scan of the stability margin of all types of LHC cables working at 1.9 K against transient heat depositions. We specifically discuss the dependence of the stability margin on the parameters of the model, which provide an estimate of the uncertainty of the values quoted. The stability margin calculations have been performed using a zero-dimensional (0-D) numerical model, and a cooling model taking into account the relevant helium phases which may appear during a stability experiment: it includes Kapitza thermal resistance in superfluid He, boundary layer formation and heat transfer in He I, and considers the transition from nucleating boiling to film boiling during He gas formation.

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Section: Heat Transfer To Heliummentioning

confidence: 99%

Section: Heat Transfer To Heliummentioning

confidence: 99%

Section: Heat Transfer To Heliummentioning

confidence: 99%

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Stability Analysis of the LHC Cables for Transient Heat Depositions

Granieri

Calvi²,

Xydi

et al. 2008

IEEE Trans. Appl. Supercond.

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“…The Nb 3 Sn wire at 7 T shows lower NZPV than NbTi at 7 T extrapolated at the same current densities. This could be due to the fact that ) /( b s s T T T − decreases with increasing T s (which is higher in Nb 3 Sn with respect to NbTi at 7 T), while the variation of the specific heat in (8) should not be very significant in this case.…”

Section: Quench Velocitiesmentioning

confidence: 93%

Comparing the thermal stability of NbTi and Nb₃Sn wires

Breschi

Trevisani

Bottura

et al. 2009

Supercond. Sci. Technol.

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The investigation of quenching in low temperature superconducting wires is of great relevance for a proper design of superconductive cables and magnets. This paper reports the experimental results of a vast measurement campaign of quench induced by laser pulses on NbTi and Nb 3 Sn wires in pool boiling Helium I. A comparison of the quench behavior of two typical NbTi and Nb 3 Sn wires is shown from different standpoints. Different qualitative behaviors of the voltage traces recorded during quenches and recoveries on NbTi and Nb 3 Sn wires are reported and analyzed. It is shown that the Nb 3 Sn wire exhibits a quench or no-quench behavior, whereas quenches and recoveries are exhibited by the NbTi wire. The two wires are also compared considering the behaviors of the two main parameters describing quench, i.e. quench energies and quench velocities, with respect to operation current and pulse duration and magnetic field. It is shown that the Nb 3 Sn wire exhibits a 'kink' of the quench energy vs current curve that makes the quench energy of Nb 3 Sn lower than that of NbTi at some intermediate current levels. Both the qualitative differences of the voltage traces and the different behaviors of quench energies and velocities are interpreted through a coupled electromagnetic-thermal model, with special emphasis on the detailed description of heat exchange with liquid helium. AbstractThe investigation of quenching in low temperature superconducting wires is of

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“…Using this experimental facility, the critical currents of Ag-sheathed Sr 0.6 K 0.4 Fe 2 As 2 superconducting tape are measured in self-field by conduction cooling between 19 This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.…”

Section: Stability Analyses Of Lts and Hts Conductors Arementioning

confidence: 99%

Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures

Liu

Zhang

Jing

et al. 2016

IEEE Trans. Appl. Supercond.

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For practical application, stability investigations of Sr0.6K0.4Fe2As2 conductors are of great importance. In this paper, quench development and propagation in Ag-sheathed are investigated experimentally and numerically. Measurements are performed as a function of transport current for several operating temperatures between 19 and 35 K. The work focuses on the evaluation of quench development, and the estimation of normal zone propagation velocity (NZPV) and minimum quench energy (MQE). The experimentally obtained temperature dependence of NZPV is compared with a simplified adiabatic model. Also, the NZPV and the MQE of the sample are compared with those of a low-temperature superconductor (LTS) and a high-temperature superconductor (HTS). According to the results, the basic quench characteristics fit between those of LTS and HTS materials.

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Minimum Quench Energy and Early Quench Development in NbTi Superconducting Strands

Cited by 18 publications

References 7 publications

Stability Analysis of the LHC Cables for Transient Heat Depositions

Stability Analysis of the LHC Cables for Transient Heat Depositions

Comparing the thermal stability of NbTi and Nb₃Sn wires

Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures

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Minimum Quench Energy and Early Quench Development in NbTi Superconducting Strands

Cited by 18 publications

References 7 publications

Stability Analysis of the LHC Cables for Transient Heat Depositions

Stability Analysis of the LHC Cables for Transient Heat Depositions

Comparing the thermal stability of NbTi and Nb3Sn wires

Quench Behaviors of Monofilament Iron-Based Sr0.6K0.4Fe2As2Tape With Ag Sheath at Different Temperatures

Contact Info

Product

Resources

About

Comparing the thermal stability of NbTi and Nb₃Sn wires

Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures