A b s Cra c C --The development of a high resolution high-field 1 GHz NMR spectrometer has been undertaken by Battelle Pacific Northwest Laboratories (BPNL). In preparation for the design of the superconducting magnet for that instrument, BPNL sponsored a program to measure the properties at high field (up to 23.5 T) and low temperature (1.8 K) of a number of commercially available superconductors. Lengths of these conductors were obtained and tested as short samples and in small coils. The critical current densities, index values and strain dependence of these properties were characterized. The potential applications of these conductors in construction of a 1 GHz NMR magnet are discussed.
Absrrud-Tbe FBNML is designing and will fabricate a radially-cooled insert magnet to generate 70% of the field of a system, Hybrid V, to surpass 45 T in a 32 mm bore. The insert is to have an overall diameter and a maximum active coil length of 610 mm. With a background field of 14 T the system should generate 47 T at 24 MW and nearly 49 T at 32 MW.The peak stress is extremely high, calling for conductors such as Be-Cu (UNS C17510) and 24% Ag-Cu with strengths up to 1100 MPa. The peak heat flux density also is high, nearly 12 W/mmz. Because the water is coldest and its velocity highest where the heat flux is highest, however, the peak temperature is only 80°C. The water flow is -200 Vs at 27 atm.The system is to be very user friendly. Access is completely unobstructed at the top. Insert removal leaves the plumbing and electrical connections intact. The massive and expensive outer coils should be long lived, the inner coil easily replaceable. During an inner coil burnout, a sleeve intercepts arcing from the inner coil to the middle one, reducing burnout severity and fault loads. The insert should be a worthy successor to those of the FBNML's world-record holding systems, Hybrids II and IIL
A b s t r a c t -T h eso called nautilus is a winding form in the shape of a double helical spiral onto which a stiff conductor is wound. The conductor is thus bent to a radius smaller than the desired local curvature. When the conductor is allowed to relax from the nautilus form, the required radius of curvature is achieved everywhere. The stiffness in the axial direction is small and compression of the wound coil to a disc is easy. The coil is tightened to a compact disc by pulling the outer tails.
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