Test Results of LARP ${\rm Nb}_{3}{\rm Sn}$ Quadrupole Magnets Using a Shell-Based Support Structure (TQS)

Caspi, S.; Dietderich, D.R.; Félice, H.; Ferracin, P.; Hafalia, R.; Hannaford, C.R.; Lietzke, A.F.; Lizarazo, J.; Sabbi, G.; Wang, X.R.; Ghosh, A.; Wanderer, P.; Ambrosio, G.; Barzi, E.; Bossert, R.; Chlachidze, G.; Fehér, S.; Kashikhin, V.V.; Lamm, M.J.; Tartaglia, M.; Zlobin, A.V.; Bajko, M.; Bordini, B.; Rijk, G. de; Giloux, C.; Karppinen, M.; Pérez, Juan Carlos; Rossi, L.; Siemko, A.; Todesco, E.

doi:10.1109/tasc.2009.2017919

Cited by 42 publications

(25 citation statements)

References 19 publications

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“…The results obtained by testing sample 3 shows clearly that a magnet based on this conductor and designed to reach its critical current at 4.2 K when the peak field in the coil is 12 T might reach its critical current at 4.2 K but it might be limited by the self-field instability at 1.9 K where the quench current might be even lower than that one at 4.2 K. Recent LARP magnet tests showed exactly this behavior [18].…”

Section: Resultsmentioning

confidence: 62%

“…1). This behavior could explain the performance of the latest LARP magnets based on the RRP conductor that, at 1.9 K, had equal or even lower quench currents with respect to the 4.4 K case [15], [16], [18]. Strand measurements also showed that: 1) covering the strand with a 1 mm thick layer of stycast reduced the quench current at 1.9 K of less than 10%; 2) the strand self-field stability can be improved by reducing the strand diameter or by reducing the critical current density.…”

Section: Discussionmentioning

confidence: 94%

“…It was also shown [7] that for RRP strand with low RRR: 1) the minimum quench current due to the self-field instability, that is the self-field stability current , is lower at 1.9 K than at 4.2 K; 2) at 1.9 K the can be considerably lower than the critical current at 12 T. The self-field instability might be the cause of the limited quench performance at 1.9 K of the latest magnets based on the RRP conductor built by the LARP collaboration [15], [16], [18].…”

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confidence: 99%

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Self Field Instability in High-${\rm J}_{\rm c}$${\rm Nb}_{3}{\rm Sn}$ Strands With High Copper Residual Resistivity Ratio

Bordini

Rossi

2009

IEEE Trans. Appl. Supercond.

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Abstract-High critical current density ( ) Nb 3 Sn conductor is the best candidate for next generation high field ( 10 T) accelerator magnets. Although very promising, state of the art highNb 3 Sn strands suffer magneto-thermal instabilities that can severely limit the strand performance. Recently it has been shown that at 1.9 K the self field instability is the dominating mechanism that limits the performance of strands with a low ( 10) Residual Resistivity Ratio (RRR) of the stabilizing copper. In this paper the self-field instability is investigated in high-Nb 3 Sn strands with high RRR. At CERN several state of the art Rod Re-Stack Process (RRP) and Powder In Tube (PIT) Nb 3 Sn strands have been tested at 4.2 K and 1.9 K to study the effects on strand stability of: RRR, strand diameter and, strand impregnation with stycast. The experimental results are reported and discussed. A new 2-D finite element model for simulating magneto-thermal instabilities and its preliminary results are also presented. The model, which describes the whole development of the flux jump in the strand cross section taking into account the heat and current diffusion in the stabilizing copper, is in good agreement with the experimental data.

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Section: Resultsmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 94%

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confidence: 99%

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Self Field Instability in High-${\rm J}_{\rm c}$${\rm Nb}_{3}{\rm Sn}$ Strands With High Copper Residual Resistivity Ratio

Bordini

Rossi

2009

IEEE Trans. Appl. Supercond.

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“…The primary goal of TQM01 was to test the mirror design and compare the quench performance of TQ coils in the mirror and quadrupole models. FIGURE 10 shows the training (left) and ramp rate (right) curves at 4.5 K for mirror TQM01 and quadrupoles TQC02E [9] and TQS02a [16]. All the models used regular TQ coils made of RRP-54/61 Nb 3 Sn strand with the only difference that the poles in coil #19 tested in TQM01 were bronze whereas the coils used in TQC02E and TQS02a had Ti poles.…”

Section: Test Results and Discussionmentioning

confidence: 99%

TESTING OF NB[sub 3]SN QUADRUPOLE COILS USING MAGNETIC MIRROR STRUCTURE

Zlobin¹,

Andreev²,

Barzi³

et al. 2010

AIP Conference Proceedings

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This paper describes the design and parameters of a quadrupole mirror structure for testing the mechanical, thermal and quench performance of single shell-type superconducting quadrupole coils at field, current and force levels similar to that of real magnet. The concept was experimentally verified by testing two quadrupole coils, previously used in quadrupole models, in the developed mirror structure in the temperature range from 4.5 to 1.9 K. The coils were instrumented with voltage taps, heaters, and strain gauges to monitor their mechanical and thermal properties and quench performance. A new quadrupole coil made of improved Nb 3 Sn RRP-108/127 strand and cable insulation based on E-glass tape was also tested using this structure. The fabrication and test results of the quadrupole mirror models are reported and discussed.

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“…The cable width was set close to the width of the LHC main dipole cable that is considered for the Phase I magnets. Nonetheless, the strand diameter was fixed at 0.7 mm used in the LARP TQ magnets [5]- [6]. For comparison purposes, a design based on NbTi cable with the same dimensions was also analyzed.…”

Section: Magnetic Designmentioning

confidence: 99%