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• W2163831325 abstract "4A-a03 SC-MAG#820 LBNL-S3243 Test Results for HD 1, a 16 Tesla Nb 3 Sn Dipole Magnet A.F. Lietzke, S. Bartlett, P. Bish, S. Caspi, L. Chiesa, D. Dietderich, P. Ferracin, S.A. Gourlay, M. Goli, R.R. Hafalia, H. Higley, R. Hannaford, W. Lau, N. Liggens, S. Mattafirri, A. McInturff, M. Nyman, G. Sabbi, R . Scanlan, and J. Swanson Abslract- The Superconducting Magnet Group at Lawrence Berkeley National Laboratory* has been developing the technology for using brittle superconductor in high-field accelerator magnets. HOI, the latest in a series of magnets, contains two, double-layer Nb]Sn Oat racetrack coils. This single- bore dipole configuration, using the highest performance conductor available, was designed and assembled for a 16 tcsla conductor/structure/prc-strcss proof-of-principle. Vith the combination of brittle conductor and high Lorentz stress, considerable care was taken to predict the magnet's mechanical responses to pre-stress, cool-down, and excitation. Subsequent cold testing satisfied expectations: Training started at 13.6 T, 83% of short-sample , achieved 90% in 10 quenches, and reached its peak bore field (16 T) after 19 quenches. The average plateau, -92% of short-sample , appeared to be limited by stick-slip conductor motions, consistent with the 16.2 T conductor lift-ofr' pre-stress that was chosen for this first test. Some lessons learned and some implications for future conductor and magnet technology development are presented and discussed. IlIllex Terms- Superconducting magnets, Dipole, High-Field, NbJSn, Test Results. I. INTRODUCTION from excessive pre-stress. All prototypes exceeded 90% of short-sample (albeit sometimes with labored training), and all, being common-coil magnets, had large stored energy, and up-down asymmetric field harmonics. This led to a desire to explore side-by-side dipoles, in which each bore's rehInt flux augmented its neighbor's, and many features that can be tested in less costly single-bore models. While a 1983 attempt by the LBNL group to utilize block-style Nb 3 Sn coils in a single-bore test encountered difficulties [7,8], the recent successes, along with experience from the sub-scale technology development program [9], encouraged a re-exploration of this coil geometry. As a result, HDI (Helmholtz-Dipole #1) was designed to cost-effectively explore the limits in Nb 3 Sn magnet teclmology, design, materials, and fabrication processes for magnets with this geometry and bore fields above 16 Tesla. II. MAGNET FEATURES AND TEST S ET-UP awrence Berkeley National Laboratory (LBNL) is continuing a vigorous development program for providing cost-effective, high-field magnet options for next generation particle accelerators and storage rings. These magnets utilize state-of-the-art Nb 3 Sn superconducting cable, and require strong, rigid, predictable mechanical support systems, able to protect the brittle conductor from large Lorentz loads. While all successful high-field Nb 3 Sn efforts have thus far utilized wind-and-react teclmology [1-5], react-and-wind teclmology is being pursued elsewhere [6]. Recent efforts have explored the dual-bore, common-coil geometry, using flat racetrack coil modules, whose major proof-of-principle tests included RTl [3] (a 2 layer coil module test at 12 T with excellent training), RD3b [4] (a 3-layer high-field structure test at 14.5 T), and RD3c [5] (a 3-layer field quality test at II T). In all cases, extreme care was taken to avoid conductor damage L Manuscript received October 20, 2003. *This work was supported under contract DE-AD03-76SF00098 by the Director, Office of Energy Research, Office of High Energy Physics, U.S . Department of Energy. All authors are or were with Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (A.F. Lietzke can be reached via phone: 510-486-4572; fax : 510-486-5310; or e-mail: AFLictzke@lbl.gov). A. Conductor alld Coils Thirty-six 0.8 mm strands of state-of-the-art, restacked-rod processed Nb 3 Sn conductor (Jc > 3000 Nmm' @ 12 T, Oxford Superconducting Tecllllology) [10] were Rutherford cabled with a compaction of 88.5% (1.361 mm x 15.75 nun). This cable was insulated with an S-glass sleeve, and wound onto an iron winding-pole, according to previous 2-layer coil procedures [4,5], excepting seven changes: I) The inter-layer ramp, being near the maximum field, was moved as close as practical to the lead-end to take advantage of the local field reduction produced by locally recessing the iron in the Y-pads. 2) One turn was removed from the outer (lower field) layer, allowing the simplest possible, inter-layer ramp, as well as unequal nlflls!layer (potentially required in future field-quality magnets). 3) The radius of the pole-island ends was significantly decreased (until the pole-end hint began to de- cable). 4) Extra glass cloth was used between coil layers (to compensate for the cable swelling of the tight pole-end hints. 5) A thin (8 mm thick) horseshoe was used to contain and protect the outer hintS during reaction and assembly. 6) Voltage-taps (1IIIayer) were installed wherever the conductor appeared vulnerable to slippage or damage. 7) Conducting skins were no longer used to protect or pre-stress the coils during assembly and operation. These changes were necessary to produce a maximum measurable field proof-of-principle test, with the fewest tunts/layer (35 itmer, 34 outer), and a" @default.
• W2163831325 created "2016-06-24" @default.
• W2163831325 creator A5013755603 @default.
• W2163831325 date "2003-10-01" @default.
• W2163831325 modified "2023-09-24" @default.
• W2163831325 title "Test Results for HD1, a 16 Tesla Nb3Sn Dipole Magnet" @default.
• W2163831325 hasPublicationYear "2003" @default.
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