The magnetic properties of the SLC (SLAC Linear Collider) intersection region superconducting quadrupole triplets

Technical Report · Sun May 01 04:00:00 EDT 1988

OSTI ID:5020652

McInturff, A D; Carson, J A; Fisk, H E; Erickson, R A

The measured magnetic field parameters of the quadrupoles which comprise the final triplet lens system for the SLAC Linear Collider intersection region are presented here. The minimum design gradient specifications for these quadrupoles are 1.7Tcm at 4.6K and 1.6Tcm at 4.6K in a 0.6T external solenoidal field. These gradients are about three times larger than those available with the conventional ironcopper quadrupoles now used in the SLC. Superconducting quadrupoles of two lengths have been specified for the SLC triplets. The effective magnetic length of type Q/sub 1/ is 66.498 +- 0.305 cm and of Q/sub 2/ is 121.106 +- 0.61 cm. The superconducting performance characteristics of the quadrupoles that have been measured are: maximum critical current as a function of bath temperature, rate of change of magnetic field, and as a percentage of the ''short sample''. ''Short sample'' performance is defined as the current reached by the cable in a perpendicular magnetic field equal to the peak field in the winding at bath temperature. The maximum gradient achieved during testing was 2.09Tcm (4.25K) and 2.10Tcm (3.2K). This represented 95% of the strand critical current value. The magnetic length of the first Q/sub 2/ was measured to be 120.85 +- .1 cm. The Fourier harmonic coefficients of the magnetic field were measured as a function of current and are reported. 3 refs., 5 figs., 6 tabs.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (USA); Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• DOE Contract Number: AC02-76CH03000; AC03-76SF00515
• OSTI ID: 5020652
• Report Number(s): FNAL-TM-1494-Rev.; ON: DE88010653
• Country of Publication: United States
• Language: English

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DESIGN
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