Magnetic Studies of AC Loss in Pressurized Rutherford Cables with Coated Strands and Resistive Cores

Collings, E. W.; Sumption, M. D.; Scanlan, R.M.; Kim, S. W.; Wake, M.; Shintomi, T.

doi:10.1007/978-1-4757-9059-7_159

Cited by 17 publications

(22 citation statements)

References 12 publications

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“…In a compromise between ICC and BICC reduction and magnet stability via interstrand current sharing it is claimed that should be about [3] and not less than 0.2 [2]. In order to control these resistances much attention has been given to surface coating the strands or separating them in the cable by means of a metallic ribbon (or core) [4].…”

Section: Magnetic Measurements Of Interstrand Contactmentioning

confidence: 99%

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: Magnetic Measurements Of Interstrand Contactmentioning

confidence: 99%

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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“…Core thicknesses from 12 µm to 50 µm were investigated. In addition to the measurements of magnetization reported here, several other studies have been published, including the effect of various core materials [3], different core thicknesses [4], and different amount of compaction [4] on the interstrand resistance values.…”

Section: Cable Manufacturementioning

confidence: 99%

Rutherford cables with anisotropic transverse resistance

Adam

Leroy

Oberli

et al. 1997

IEEE Trans. Appl. Supercond.

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Putting a resistive core into the center of a Rutherford cable increases resistance between strands in the crossover direction, which greatly reduces the coupling currents, even when the resistance to adjacent turns remains small. This allows one to improve stability by soldering strands together or using porous metal, without incurring a penalty of increased coupling. We describe our manufacturing methods and an experimental measurement of coupling. Abstract -Putting a resistive core into the center of a Rutherford cable increases resistance between strands in the crossover direction, which greatly reduces the coupling currents, even when the resistance to adjacent turns remains small. This allows one to improve stability by soldering strands together or using porous metal, without incurring a penalty of increased coupling. We describe our manufacturing methods and an experimental measurement of coupling.

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“…The SnAg (Stabrite) soft coatings produce very low contact resistance with applied load (59,63) and are not recommended for low-loss cables. A resistive barrier can be obtained by a diffusion heat treatment at 200 • C of the SnAg-coated strand before cabling, building a Sn-rich bronze shell at the surface; however, the diffusion heat treatment also affects the (RRR) of a fraction of the stabilizer.…”

Section: Coupling Loss In Flat Cablesmentioning

confidence: 99%