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• W801377903 abstract "SU-MAG LBL32635 The Evoh,don of Tooling, Techniques, and Quality Control for Accelerator Dipole Magnet Cables LBL--32635 DE93 002447 R.M. Scal_m LawrenceBerkeley Laborato_ 1 CyclotronRoad Berkeley,CA 94720 Abstract - I'nepresent generationof particleacceleratorsare utilizing the flattened, compacted, single layer cable design introduced nearly 20 years ago at Rutherford Laboratory. However, the requirements for current density, f'dament size, dimensionalcontrol, long lengths, and low current degradation are much more stringent for the present accelerators compared with the earlier Tevatron and HERA accelerators. Also, in order to achieve higher field strengths with efficient use of superconductor, the new designs require wider cables with more strands. These requirements have stimulated an active research effort which has led to significant improvements in critical current density and conductor manufacturing. In addition they have stimulated the development of new cabling techniques, improved tooling, and better measurement techniques. The need to produce over 20 million meters of cable has led to the development of high speed cabling machines and on-line qualityassurancemeasurements. These new developments will be discussed, and areas still requiring improvement will be identified, I. INTRODUCTION II. SELECTIONAND OFFIMIZATIONOF STRAND PARAMETERS A. Critical current density andfilament diameter The initial parameters for the SSC collider magnets were selected in the Reference Designs Study (RDS) in 1984 (1), Table 1, which identified three optional designs for further evaluation. In order to compare these options on an equal basis, a critical current density of 2400 A/mm2 at 5 T was chosen as a mimimum specification value. Inis _presented a significant increase over the value of 1800 A/mm z which was specified for the NbTi superconductor used in the Tevatron (2). Since this value had not yet been achieved in large scale production, an RD this requires the coil sizes be precise and reproducible. These that requirements have led to a significant increase in the performance required, and a reduction in the allowable tolerances for the current generation of accelerator magnets, i.e. SSC and LHC, compared with those for earlieraccelerator magnets, i.e. those for HERA and the Tevatron. For example, the dipole cable mid-thickness tolerance for HERA is :!:.02 mm, while the tolerance for SSC is +.006 mm. Recent experience has shown that these decreases in the tolerances can be achieved through improvements in tooling, cabling techniques, and measuring equipment. The technological advances which have led to these unproved properties and tightertolerances will now be discussed. ,b This work was supported the Director,Office of Energy by Research,Office of High Energy and Nuclear Physics, Division of High Energy Physics of the U.S. Department of EnergyunderContract No. DE-AC03-76SF00098. Stabrite Stabrite Reference criticalcurrent density b) [A/mm2J Copper-to-superconductor ratio Filament iameter d [tim] Strand diameter [mm] Dimensional tolerance[mm] No. of f'daments Copper residualresistivity ratio(before extrusion) Strand twistpitch[percna] Strand coating '_High-homogeneitymaterial b_At 1 , K,andaresistivity 10 14 of Dan" @default.
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• W801377903 date "2011-01-11" @default.
• W801377903 modified "2023-10-16" @default.
• W801377903 title "The Evolution of Tooling, Technical and Quality Control for Accelerator Dipole Magnet Applications" @default.
• W801377903 hasPublicationYear "2011" @default.
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