Interstrand Coupling Properties of LARP High Gradient Quadrupole Cables in Response to Variations in Cable Design and Heat Treatment Condition
- Resource Type
- Periodical
- Authors
- Collings, E.W.; Sumption, M.D.; Majoros, M.; Wang, X.; Dietderich, D.R.; Yagotyntsev, K.; Nijhuis, A.
- Source
- IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 27(4):1-5 Jun, 2017
- Subject
- Fields, Waves and Electromagnetics
Engineered Materials, Dielectrics and Plasmas
Couplings
Loss measurement
Magnetic cores
Superconducting magnets
Large Hadron Collider
Cable insulation
Magnetization
Rutherford cables
++%24%5F{3}%24<%2Ftex-math>+<%2Finline-formula>+<%2Fnamed-content>Sn+cables%22">Nb $_{3}$ Sn cables
cored cables
interstrand contact resistance
coupling current
coupling magnetization
reaction-heat-treatment
- Language
- ISSN
- 1051-8223
1558-2515
2378-7074
Calorimetric measurement of coupling loss versus frequency has been measured on two sets of cored and uncored large Hadron Collider Accelerator Research Program high gradient quadrupole Nb 3 Sn Rutherford cables. Studied are the responses of the resulting interstrand contact resistances (ICR) to variation of stainless-steel (SS) core width and position and to variation of reaction-heat-treatment (RHT) condition. One pair of cables (an early HQ-series type) with and without core had received RHT under 20-MPa uniaxial face-on pressure. Another set of cables (recent QXF type) furnished with SS cores of various widths had received RHT under ambient pressure. The results were displayed as cable-cross-sectional micrographs and plots of ICR versus percent core coverage (W). The HQ cables were tightly compacted and produced results consistent with a previously expected continuous ICR versus W variation. On the other hand, the QXF cables were uncompacted such that their upper and lower layers were separated by what is referred to as a full-width “pseudocore;” as a result, their ICRs were independent of the widths of the SS cores. Compaction versus noncompaction is discussed and future research directions are suggested.