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Title: Interstrand Coupling Properties of LARP High Gradient Quadrupole Cables in Response to Variations in Cable Design and Heat Treatment Condition

Journal Article · · IEEE Transactions on Applied Superconductivity
 [1];  [1];  [1];  [2];  [2];  [3];  [3]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of Twente, Enschede (The Netherlands)
+ Show Author Affiliations

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 Nb3Sn 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. Furthermore, 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1510744
Journal Information:
IEEE Transactions on Applied Superconductivity, Vol. 27, Issue 4; ISSN 1051-8223
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)Copyright Statement
Country of Publication:
United States
Language:
English

References (14)

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Coupling Loss, Interstrand Contact Resistance, and Magnetization of Nb$_{3}$Sn Rutherford Cables With Cores of MgO Tape and S-Glass Ribbon journal June 2011
Industrial policy: formation and development directions journal January 2008
Effects of Core Type, Placement, and Width on the Estimated Interstrand Coupling Properties of QXF-Type Nb3Sn Rutherford Cables journal June 2015
Analysis of magnetization, AC loss, and deff for various internal-Sn based Nb3Sn multifilamentary strands with and without subelement splitting journal October 2004
Core-suppressed AC loss and strand-moderated contact resistance in a Nb3Sn Rutherford cable journal January 1999
Extracted Strand Magnetizations of an HQ Type $ \hbox{Nb}_{3}\hbox{Sn}$ Rutherford Cable and Estimation of Transport Corrections at Operating and Injection Fields journal June 2014
Measurement of AC loss and magnetic field during ramps in the LHC model dipoles journal June 1999
Multipoles Induced by Inter-Strand Coupling Currents in LARP $\hbox{Nb}_{3}\hbox{Sn}$ Quadrupoles journal June 2014
Nb3Sn High Field Magnets for the High Luminosity LHC Upgrade Project journal June 2015
Performance of HQ02, an Optimized Version of the 120 mm $\hbox{Nb}_{3}\hbox{Sn}$ LARP Quadrupole journal June 2014
Field Quality Measurements of LARP $\hbox{Nb}_{3} \hbox{Sn}$ Magnet HQ02 journal June 2014
Interstrand Contact Resistance and Magnetization of ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Rutherford Cables With Cores of Different Materials and Widths journal June 2012
MEASUREMENTS OF AC LOSS IN CORED Nb[sub 3]Sn RUTHERFORD CABLES: INTERSTRAND CONTACT RESISTANCE AS FUNCTION OF CORE WIDTH conference January 2008

Figures / Tables (7)

TABLE I(p. 3)table TABLE I
TABLE II(p. 3)table TABLE II
Fig. 1(p. 4)figure Fig. 1
TABLE III(p. 4)table TABLE III
Fig. 2(p. 5)figure Fig. 2
Fig. 3(p. 5)figure Fig. 3
Fig. 4(p. 5)figure Fig. 4

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Rutherford cables
Nb$_{3}$Sn cables
cored cables
interstrand contact resistance
coupling current
coupling magnetization
reaction-heat-treatment