Studies of ${\rm Nb}_{3}{\rm Sn}$ Strands Based on the Restacked-Rod Process for High Field Accelerator Magnets

Barzi, E.; Bossert, M.; Gallo, G; Lombardo, V.; Turrioni, D.; Yamada, R.; Zlobin, A.V.

doi:10.1109/tasc.2011.2181298

Cited by 11 publications

(15 citation statements)

References 8 publications

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“…The significant persistent current effect, seen at low currents in the T F and b 3 , b 5 field harmonics, is due to large D ef f and J c of the Nb 3 Sn strand [13]. The experimental results are in a good agreement with calculations at currents above 2 kA after coil re-magnetization.…”

Section: A Magnet Geometry Persistent Current and Iron Saturation Esupporting

confidence: 74%

Field Quality Measurements in a Single-Aperture 11 T $ \hbox{Nb}_{3}\hbox{Sn}$ Demonstrator Dipole for LHC Upgrades

Andreev

Apollinari

Auchmann

et al. 2013

IEEE Trans. Appl. Supercond.

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The upgrade of the Large Hadron Collider (LHC) collimation system foresees additional collimators in the LHC dispersion suppressor areas. The longitudinal space for the collimators could be provided by replacing some NbTi LHC main dipoles with shorter 11 T Nb 3 Sn dipoles. To demonstrate this possibility, Fermilab and CERN have started a joint program to develop a Nb 3 Sn dipole prototype suitable for installation in the LHC. The first step of this program is the development of a 2-mlong, 60-mm-bore, single-aperture demonstrator dipole with the nominal field of 11 T at the LHC operational current of 11.85 kA. This paper presents the results of magnetic measurements of the single-aperture Nb 3 Sn demonstrator dipole including geometrical harmonics, coil magnetization, and iron saturation effects. The experimental data are compared with the magnetic calculations.Index Terms-Field quality, magnetic measurement, superconducting accelerator magnets.

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Section: A Magnet Geometry Persistent Current and Iron Saturation Esupporting

confidence: 74%

Field Quality Measurements in a Single-Aperture 11 T $ \hbox{Nb}_{3}\hbox{Sn}$ Demonstrator Dipole for LHC Upgrades

Andreev

Apollinari

Auchmann

et al. 2013

IEEE Trans. Appl. Supercond.

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“…1(b)], an 11-T cos θ dipole developed at FNAL for the High-Luminosity LHC (HL-LHC) [29]. The MBHSP02 magnet used a cored cable with RRP 150/169 Nb 3 Sn conductor [30]. It was trained to ∼ 97% of the magnet design field of 12 T [31] or ∼ 80% of its SSL at 1.9 K.…”

mentioning

confidence: 99%

“…Magnetization of the strands used in the magnets. The MBHSP02 strand data is from [30]. The inset shows the flux jumps when the applied field is below 1 T at 4.5 K and below 3 T for the 108/127 strand at 1.9 K.…”

mentioning

confidence: 99%

“…compares the measured and calculated transfer function and sextupole b 3 for MBHSP02. The calculation was performed based on the strand magnetization measured with the applied field up to 3 T at 4.2 K[30]. The calculated transfer function is offset by +0.012 T/kA to match the measurements up to 3 T. For b 3 , an offset of +8.44 units due to the geometric effect is applied[42].C.…”

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confidence: 99%

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Validation of Finite-Element Models of Persistent-Current Effects in Nb<sub>3</sub>Sn Accelerator Magnets

Wang

Ambrosio

Chlachidze

et al. 2015

IEEE Trans. Appl. Supercond.

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Persistent magnetization currents are induced in superconducting filaments during the current ramping in magnets. The resulting perturbation to the design magnetic field leads to field quality degradation, in particular at low field where the effect is stronger relative to the main field. The effects observed in NbTi accelerator magnets were reproduced well with the criticalstate model. However, this approach becomes less accurate for the calculation of the persistent-current effects observed in Nb3Sn accelerator magnets. Here a finite-element method based on the measured strand magnetization is validated using three state-ofthe-art Nb3Sn accelerator magnets featuring different subelement diameters, conductor critical currents, magnet designs and test temperatures. The temperature dependence of the persistentcurrent effects is reproduced. Based on the validated model, the impact of conductor design on the persistent-current effects is discussed. The strengths, limitations and possible improvements of the approach are also discussed.Index Terms-Nb3Sn accelerator magnets, field quality, magnetization.

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“…4. V-I and V-H test results in superfluid He at 1.9 K of two different RRP® wires of same Jc and size [13]. Fig.…”

Section: ) J C Of Round Wiresmentioning

confidence: 99%

Superconductor requirements and characterization for high field accelerator magnets

Barzi

Zlobin

2015

2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

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The 2014 Particle Physics Project Prioritization Panel (P5) strategic plan for U.S. High Energy Physics (HEP) endorses a continued world leadership role in superconducting magnet technology for future Energy Frontier Programs. This includes 10 to 15 T Nb 3 Sn accelerator magnets for LHC upgrades and a future 100 TeV scale pp collider, and as ultimate goal that of developing magnet technologies above 20 T based on both High Temperature Superconductors (HTS) and Low Temperature Superconductors (LTS) for accelerator magnets. To achieve these objectives, a sound conductor development and characterization program is needed and is herein described. This program is intended to be conducted in close collaboration with

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Studies of ${\rm Nb}_{3}{\rm Sn}$ Strands Based on the Restacked-Rod Process for High Field Accelerator Magnets

Cited by 11 publications

References 8 publications

Field Quality Measurements in a Single-Aperture 11 T $ \hbox{Nb}_{3}\hbox{Sn}$ Demonstrator Dipole for LHC Upgrades

Field Quality Measurements in a Single-Aperture 11 T $ \hbox{Nb}_{3}\hbox{Sn}$ Demonstrator Dipole for LHC Upgrades

Validation of Finite-Element Models of Persistent-Current Effects in Nb<sub>3</sub>Sn Accelerator Magnets

Superconductor requirements and characterization for high field accelerator magnets

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