Test Results of HD1b, an Upgraded 16 Tesla$rm Nb_3rm Sn$ Dipole Magnet
| Autor: | Paolo Ferracin, G.L. Sabbi, W. Lau, S.A. Gourlay, D.R. Dietderich, R.M. Scanlan, Shlomo Caspi, P. Bish, A.F. Lietzke, A.R. Hafalia, C.R. Hannaford, S. Mattafirri, Hugh Higley, M. Nyman, J. Swanson, N. Liggins, S.E. Bartlett |
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| Rok vydání: | 2005 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Particle accelerator Superconducting magnet Condensed Matter Physics Plateau (mathematics) Electronic Optical and Magnetic Materials Conductor law.invention Nuclear physics Electromagnetic coil Dipole magnet law Magnet Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 15:1123-1127 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/tasc.2005.849509 |
| Popis: | The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing high-field, brittle-superconductor, accelerator magnet technology, in which the conductor's support system can significantly impact conductor performance (as well as magnet training). A recent H-dipole coil test (HD1) achieved a peak bore-field of 16 Tesla, using two, flat-racetrack, double-layer Nb/sub 3/Sn coils. However, its 4.5 K training was slow, with an erratic plateau at /spl sim/92% of its un-degraded "short-sample" expectation (/spl sim/16.6 T). Quench-origins correlated with regions where low conductor pre-stress had been expected (3-D FEM predictions and variations in 300 K coil-size). The coils were re-assembled with minor coil-support changes and re-tested as "HD1b", with a 185 MPa average pre-stress (30 MPa higher than HD1, with a 15-20 MPa pole-turn margin expected at 17 T). Training started higher (15.1 T), and quickly reached a stable, negligibly higher plateau at 16 T. After a thermal cycle, training started at 15.4 T, but peaked at 15.8 T, on the third attempt, before degrading to a 15.7 T plateau. The temperature dependence of this plateau was explored in a sub-atmospheric LHe bath to 3.0 K. Magnet performance data for both thermal cycles is presented and discussed, along with issues for future high-field accelerator magnet development. |
| Databáze: | OpenAIRE |
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