Effects of neutron irradiation on pinning force scaling in state-of-the-art Nb<sub>3</sub>Sn wires

Baumgartner, T.; Eisterer, M.; Weber, H.W.; Flükiger, R.; Scheuerlein, C.; Bottura, L.

doi:10.1088/0953-2048/27/1/015005

Cited by 80 publications

(86 citation statements)

References 23 publications

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“…Manuscript In this work the effects of proton irradiation on the superconducting properties of ternary RRP and PIT Nb 3 Sn wires are studied. Interesting aspects are revealed by a comparison between the present results and those obtained by T. Baumgartner et al [2] on the same Nb 3 Sn wires in the frame of collaboration between CERN and Atominstitut Vienna.…”

Section: Introductionsupporting

confidence: 71%

“…The decrease of T c at 24 GeV is larger for the RRP Ta alloyed wires than for the Ti alloyed wire. The variation of T c due to proton irradiation (about 3%) at 1.38 × 10 21 p/m 2 is equal to the variation found after neutron irradiation on the same Nb 3 Sn wires at neutron fluences about one order of magnitude higher [2].…”

Section: Resultsmentioning

confidence: 60%

“…The temperature was monitored with three Cernox thermometers. The critical current density in the A15 layer, J c (A15), before and after proton irradiation was evaluated with the approximation method described in [2]. The upper critical fields before irradiation, B c20 , and their increment after irradiation were determined by means of the optimization method described in the next section.…”

Section: B Magnetization Measurementsmentioning

confidence: 99%

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Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Spina

Scheuerlein

Richter

et al. 2015

IEEE Trans. Appl. Supercond.

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A recent proton irradiation study on Ta and Ti alloyed industrial multifilamentary Nb 3 Sn wires has now been extended to fluences up to 1.38 × 10 21 p/m 2 , the Bragg peak region being located outside of the wire. In the present work, magnetization measurements were performed up to 14 K and 10 T, to follow and determine with more precision the development of the upper critical field B c2 with fluence. It was found that the critical temperature, T c , decreases linearly with increasing fluences, about 3% up to the highest fluence 1.38 × 10 21 p/m 2 . The transition width does not change after irradiation, thus reflecting a homogeneous damage in analogy to neutron irradiation. Both the critical current density, J c , and the upper critical field, B c2 , were found to increase in the considered fluence range. It was obtained that the larger enhancement of J c , (about 45% for Ta alloyed wires and 100% for Ti alloyed wires at 10 T) is not correlated to that of B c2 (about 5% for Ti alloyed and 10% for Ta alloyed up to the highest fluence). The enhancement of J c in Ta alloyed wires is very similar for both PIT and RRP processing, thus assigning a major importance to the nature of the additive. The present results after irradiation were analysed applying the two-mechanism model on the volume pinning force, taking into account both grain boundary pinning and point pinning. A comparison between the present results and those achieved after neutron irradiation on the same Nb 3 Sn wires shows that protons cause considerably higher damage than neutrons: the same effect on J c and T c is already observed at fluences being one order of magnitude smaller.Index Terms-Bragg-Williams LRO parameter, flux pinning induced by proton irradiation, HL-LHC upgrade, magnetization, radiation damage.

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Section: Introductionsupporting

confidence: 71%

Section: Resultsmentioning

confidence: 60%

Section: B Magnetization Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Spina

Scheuerlein

Richter

et al. 2015

IEEE Trans. Appl. Supercond.

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“…Although the superposition of different mechanisms is common (e.g. refs 46 and 47), their independence as revealed by different effective fields is unusual (one example is given by ref. 48, where, however, the high and low field regions were separately fitted using all exponents as free parameters).…”

Section: Discussionmentioning

confidence: 99%

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure

Tarantini

Iida

Hänisch

et al. 2016

Sci Rep

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Fe-based superconductors (FBS) present a large variety of compounds whose properties are affected to different extents by their crystal structures. Amongst them, the REFeAs(O,F) (RE1111, RE being a rare-earth element) is the family with the highest critical temperature Tc but also with a large anisotropy and Josephson vortices as demonstrated in the flux-flow regime in Sm1111 (Tc ∼ 55 K). Here we focus on the pinning properties of the lower-Tc Nd1111 in the flux-creep regime. We demonstrate that for H//c critical current density Jc at high temperatures is dominated by point-defect pinning centres, whereas at low temperatures surface pinning by planar defects parallel to the c-axis and vortex shearing prevail. When the field approaches the ab-planes, two different regimes are observed at low temperatures as a consequence of the transition between 3D Abrikosov and 2D Josephson vortices: one is determined by the formation of a vortex-staircase structure and one by lock-in of vortices parallel to the layers. This is the first study on FBS showing this behaviour in the full temperature, field, and angular range and demonstrating that, despite the lower Tc and anisotropy of Nd1111 with respect to Sm1111, this compound is substantially affected by intrinsic pinning generating a strong ab-peak in Jc.

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“…12 и T c (0) = 16.8 K для образца Alstom (#63468), что соответствует значению нормированной температуры, равному единице (рис. 2), и хорошо согласуется с данными работы [6]. По всей видимости, одним из наиболее вероятных объяснений такой зависимости может являть-ся размытие пика плотности электронных состояний в облучаемом материале в результате радиационно-стимулированного образования радиационных дефектов замещения [7].…”

Section: поступило в редакцию 26 сентября 2016 гunclassified

Влияние облучения быстрыми протонами с энергией 32 MeV на критические параметры современных композиционных проводов на основе сверхпроводящего соединения Nb-=SUB=-3-=/SUB=-Sn

Дегтяренко¹,

Ballarino²,

Bottura³

et al. 2017

Письма В Журнал Технической Физики

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Методами вибрационной магнитометрии проведены исследования изменений электрофизических характеристик нескольких типов современных коммерче-ских многожильных композиционных проводов на основе сверхпроводящего соединения Nb 3 Sn при температурах 4.2, 7 и 12 K в магнитных полях до 8 T до и после облучения на циклотроне НИЦ КИ быстрыми протонами с энергией 32 MeV и флюенсами облучения φt = 3 · 10 16 , 1 · 10 17 , 3 · 10 17 и 1 · 10 18 cm −2 . Для всех образцов при флюенсах облучения до φt = 1 · 10 17 cm −2 отмечен рост критической плотности тока, наиболее резко выраженный в сильных магнитных полях и при низких температурах; при флюенсе облучения φt = 1 · 10 18 cm −2 наблюдается падение критической плотности тока до уровня меньше исходного. Критическая температура образцов монотонно уменьшается с ростом флюенса облучения.

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Effects of neutron irradiation on pinning force scaling in state-of-the-art Nb₃Sn wires

Cited by 80 publications

References 23 publications

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure

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Effects of neutron irradiation on pinning force scaling in state-of-the-art Nb3Sn wires

Cited by 80 publications

References 23 publications

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Variation of the Critical Properties of Alloyed Nb-Sn Wires After Proton Irradiation at 65 MeV and 24 GeV

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure

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Effects of neutron irradiation on pinning force scaling in state-of-the-art Nb₃Sn wires