Design of epoxy-free superconducting dipole magnets and performance in both Helium I and pressurized Helium II

Abstract

Abstract. Three model superconducting dipole magnets 1m long, without iron, having a bore diameter of 76 mm have been built without epoxy resins or other adhesives and tested in He I and He 11. The conductor is the 23-strand Rutherford-type cable used in the Fermilab Doubler Saver magnets, and is insulated with Mylar and Kapton. The two-layer winding is highly compressedby a system of structural support rin^s and tapered collets. Little "training" was required to reach quench currents greater than 95 percent of "short sample" in Helium I. The maximum quench current in He II is increased ?0 to 30 percent, compared with He I operation at 4.4 K. Test results are given on cyclic losses, heater-induced quenches, and charge-rate effects.

Alternative Dipole Magnets for Isabelle

“…The same type of training behavior found in 76-mm-bore-diameter, 2-layer iron-free magnets [1] is found in these larger-bore, 3-layer magnets.…”

“…Following the techniques developed for 76 mm-bore diam, two-layer model coils [1], a three-layer windinq was made in which each lay<sr was wound directly over the previous layer (Fig. 1).…”