AC loss measurement of the 45-T hybrid/CIC conductor

Baudouy, B.; Bartholomew, K.; Miller, J.R.; Sciver, S.W. Van; Oliva, A. Bonito

doi:10.1109/77.402641

Cited by 8 publications

(3 citation statements)

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“…Cr plating [11]- [13], surface carbonization [14]- [16], or the introduction of a stainless steel core [16]. While the present experiments show that a clean uncored cable can under some circumstances present an closer to "ideal" (Cable-5 with , measured under ) the result is so unpredictable that application some kind of contact-controlling techniques is recommended.…”

Section: B Control Of Icrmentioning

confidence: 86%

Magnetic Measurements of Interstrand Contact Resistance in<tex>$rm Nb_3rm Sn$</tex>Cables in Response to Variation of Pre-Heat-Treatment Condition

Collings

Sumption

Dietderich

et al. 2006

IEEE Trans. Appl. Supercond.

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Inductive (pickup-coil) magnetometry was used to measure AC loss in uncored Nb 3 Sn Rutherford cables in the perpendicular and parallel orientations of the applied field. The four cables selected for study had widths of 8, and 13 mm and strand counts of 20 and 30, respectively. Under various surface conditions they were reaction heat treated (RHT) then vacuum impregnated with resin in preparation for measurement. The magnetic measurements were made at 4.2 K in sinusoidal fields of amplitude 400 mT and frequencies of 5 to 90 mHz, The total per-cycle loss so obtained was used to deduce the "crossover" interstrand contact resistance (ICR). Attention is focused on the ICRs of one particular 8-mm/20-strand cable measured in this and previous studies under several pre-RHT conditions: (i) as-received, (ii) acetone-degreased, and (iii) acetone-degreased then HCl-deoxidized then acetone rinsed. A comparison is also made to the ICR of a sub-size cored Nb 3 Sn cable.

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Section: B Control Of Icrmentioning

confidence: 86%

Magnetic Measurements of Interstrand Contact Resistance in<tex>$rm Nb_3rm Sn$</tex>Cables in Response to Variation of Pre-Heat-Treatment Condition

Collings

Sumption

Dietderich

et al. 2006

IEEE Trans. Appl. Supercond.

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“…But in order to control the coupling currents in a standard Rutherfordtype LHC cable a lower limit of 20 ෂ 30 ⍀ has been recommended [21]. To suppress interstrand sintering the pre-reacted strands have been plated with Cr [22], or coated with a synthetic lubricating oil (Mobil 1™) [3,23] which during RHT decomposed to leave behind an adherent deposit of C. This approach has been successfully used in cable-in-conduit conductors [22,23]. On the other hand the Nb 3 Sn Rutherford cables used in the two most recent high-field dipole magnets (the University of Twente's 11 T, 4.2 K, dipole [24] and the Lawrence Berkeley National Laboratory's 12.8 T, 4.3 K, dipole [25]) were both wound with bare, uncoated, strand.…”

Section: Introductionmentioning

confidence: 99%

Core-suppressed AC loss and strand-moderated contact resistance in a Nb3Sn Rutherford cable

et al. 1999

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“…Although the ac loss of the CICC with hydrocarbon oil has been measured under zero Lorentz load [10], its R C and the effects of transverse load and load cycles on R C have not been studied systematically. We designed and built an apparatus to measure R C of CICCs under transverse cyclic load.…”

Section: Introductionmentioning

confidence: 99%

The inter-strand contact resistance of Nb₃Sn cable-in-conduit conductor with hydrocarbon oil

Lü¹,

Toplosky²,

Han³

et al. 2008

Supercond. Sci. Technol.

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The inter-strand contact resistance (R C ) of Nb 3 Sn cable-in-conduit conductors (CICCs) is a very important parameter which strongly correlates with ac losses and current redistribution behavior of the CICCs. One way to obtain the desired R C is to apply a layer of hydrocarbon oil on the Nb 3 Sn strands before the CICC Nb 3 Sn reaction heat treatment. In this paper, we measured R C for a Nb 3 Sn CICC sample fabricated with hydrocarbon oil. The measurements were performed using an apparatus designed to apply transverse load and load cycling on CICCs at 4.2 K. Resistances R C between strands of different cabling stages were measured with transverse load up to 188 kN m −1 and load cycles up to 10 000. The results show that R C of the sample increases almost linearly with the first loading. With load cycling, R C increases rapidly at first, but becomes saturated after ∼100 cycles. After 10 000 load cycles, R C decreases with increasing load at a decreasing rate. These behaviors are comparable to observations for CICC with Cr plated strands reported in the literature. Therefore from the R C point of view, Nb 3 Sn CICCs with hydrocarbon oil on strands may be used as a low cost alternative to CICCs with Cr plated strands.

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AC loss measurement of the 45-T hybrid/CIC conductor

Cited by 8 publications

References 3 publications

Magnetic Measurements of Interstrand Contact Resistance in<tex>$rm Nb_3rm Sn$</tex>Cables in Response to Variation of Pre-Heat-Treatment Condition

Magnetic Measurements of Interstrand Contact Resistance in<tex>$rm Nb_3rm Sn$</tex>Cables in Response to Variation of Pre-Heat-Treatment Condition

Core-suppressed AC loss and strand-moderated contact resistance in a Nb3Sn Rutherford cable

The inter-strand contact resistance of Nb₃Sn cable-in-conduit conductor with hydrocarbon oil

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AC loss measurement of the 45-T hybrid/CIC conductor

Cited by 8 publications

References 3 publications

Magnetic Measurements of Interstrand Contact Resistance in<tex>$rm Nb_3rm Sn$</tex>Cables in Response to Variation of Pre-Heat-Treatment Condition

Magnetic Measurements of Interstrand Contact Resistance in<tex>$rm Nb_3rm Sn$</tex>Cables in Response to Variation of Pre-Heat-Treatment Condition

Core-suppressed AC loss and strand-moderated contact resistance in a Nb3Sn Rutherford cable

The inter-strand contact resistance of Nb3Sn cable-in-conduit conductor with hydrocarbon oil

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The inter-strand contact resistance of Nb₃Sn cable-in-conduit conductor with hydrocarbon oil