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Author(s)
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Lietzke, A F (LBL, Berkeley) ; Bartlett, S (LBL, Berkeley) ; Bish, P (LBL, Berkeley) ; Caspi, S (LBL, Berkeley) ; Chiesa, L (LBL, Berkeley) ; Dietderich, D (LBL, Berkeley) ; Ferracin, P (LBL, Berkeley) ; Gourlay, S A (LBL, Berkeley) ; Goli, M (LBL, Berkeley) ; Hafalia, R R (LBL, Berkeley) ; Higley, H (LBL, Berkeley) ; Hannaford, R (LBL, Berkeley) ; Lau, W (LBL, Berkeley) ; Liggens, N (LBL, Berkeley) ; Mattafirri, S (LBL, Berkeley) ; McInturff, A (LBL, Berkeley) ; Nyman, M (LBL, Berkeley) ; Sabbi, G (LBL, Berkeley) ; Scanlan, R (LBL, Berkeley) ; Swanson, J (LBL, Berkeley) |
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Abstract
| The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing the technology for using brittle superconductor in high-field accelerator magnets. HD1, the latest in a series of magnets, contains two, double-layer Nb$_3$Sn flat racetrack coils. This single-bore dipole configuration, using the highest performance conductor available, was designed and assembled for a 16 tesla conductor/structure/pre-stress proof-of-principle. With 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-off" 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. |