Test and Analysis of Technology Quadrupole Shell (TQS) Magnet Models for LARP

Caspi, S.; Ambrosio, G.; Andreev, A. N.; Barzi, E.; Bossert, R.; Dietderich, D.R.; Ferracin, P.; Ghosh, A.; Hafalia, A.R.; Kashikhin, V.V.; Lietzke, A.F.; Novitski, I.; Sabbi, G.; Zlobin, A.V.

doi:10.1109/tasc.2008.920821

Cited by 18 publications

(9 citation statements)

References 15 publications

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“…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: 93%

“…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].…”

mentioning

confidence: 96%

“…Using such approach the U.S. LHC Accelerator Research Program (LARP) collaboration was able to build and test a few magnets that reached at 4.4 K more than 80% of the short sample limit and did not show evidences of magnetization instability. These magnets were based on the Modified Jelly Roll (MJR, , ) strand [15] or on the Rod Re-Stack Process (RRP, , ) strand [15]- [17] produced by Oxford Superconducting Technology (OST).…”

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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: Discussionmentioning

confidence: 93%

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confidence: 96%

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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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“…TQC02E [8] used coils previously tested in TQS02a [4]. Collared preload was increased with respect to TQC01b but final yoked preload was kept the same.…”

Section: B Tqc02ementioning

confidence: 99%

Development and Test of LARP Technological Quadrupole Models of TQC Series

Bossert

Ambrosio

Andreev

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-In support of the development of a large-aperture Nb3Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, several two-layer technological quadrupole models of TQC series with 90 mm aperture and collar-based mechanical structure have been developed at Fermilab in collaboration with LBNL. This paper summarizes the results of fabrication and test of TQC02a, the second TQC model based on RRP Nb3Sn strand, and TQC02b, built with both MJR and RRP strand. The test results presented include magnet strain and quench performance during training, as well as quench studies of current ramp rate and temperature dependence from 1.9K to 4.5K.

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“…The US LHC Accelerator Research Program (LARP) continues to develop Nb3Sn IR quads for Hi-Lumi LHC. Initial LARP Technology Quads (TQ) had a bore size of 90 mm [3,4] and a length of 1 meter. TQ was successfully scaled up to 3.7 meters for the first long Nb3Sn quadrupole LQ [5].…”

Section: Introductionmentioning

confidence: 99%