A U.S. Department of Energy Office of Science Laboratory Operated by The University of Chicago Argonne National Laboratory Office of Science U.S. Department.

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Presentation transcript:

A U.S. Department of Energy Office of Science Laboratory Operated by The University of Chicago Argonne National Laboratory Office of Science U.S. Department of Energy Magnet Material Choice LCLS Undulator System Final LLP Pre-production Review Nov 2004 Liz Moog

Pioneering Science and Technology Office of Science U.S. Department of Energy 2 Potential vendors Prequalified: Shin-Etsu Neomax (formerly Sumitomo Special Metals) Others: Outokumpu Vacuumschmelze Ugimag Dexter (representing Chinese manufacturer)

Pioneering Science and Technology Office of Science U.S. Department of Energy 3 A significant issue for LCLS magnet choice is radiation resistance. Radiation resistance has been found to vary with the vendor Within a particular vendor’s line, higher coercivity is correlated to better radiation resistance. Radiation resistance

Pioneering Science and Technology Office of Science U.S. Department of Energy 4 Some published radiation results LabelMaterialBr (T)Hcj (kA/m) V411VACODYM V400VACODYM V396VACODYM N32NEOMAX-32EH N35NEOMAX-35EH N44NEOMAX-44H C2300CORMAX Reprinted from Nucl. Instrum. Meth. Phys. Res. A, Vol , T. Bizen et al., “Demagnetization of undulator magnets irradiated by high energy electrons”, pp (2001), with permission from Elsevier.

Pioneering Science and Technology Office of Science U.S. Department of Energy 5 Shin-Etsu magnet grades N39SH from Shin-Etsu was used for the prototype undulator, but newer and better magnet grades are now available

Pioneering Science and Technology Office of Science U.S. Department of Energy 6 Neomax magnet grades Neomax 38VH is equivalent to Shin-Etsu N39UH

Pioneering Science and Technology Office of Science U.S. Department of Energy 7 Newest grade availability / cost Neomax gave us quotes for 42AH and 44AH on a recent (summer 2004) magnet procurement. Cost was ~25% higher than for 38VH. Delivery schedule was 90 days longer (240 days vs 150 days). These grades require an ingredient that presents availability challenges. Neomax is presently challenged to meet customer demand; they are expanding production capability

Pioneering Science and Technology Office of Science U.S. Department of Energy 8 Heat treatment can improve NdFeB resistance Radiation effect on 35EH magnets after different bake times at 142°C. Longest bake is 24 hrs. (Reprinted from Nucl. Instrum. Meth. Phys. Res. A, Vol. 515, T. Bizen et al., “Baking effect for NdFeB magnets against demagnetization induced by high energy electrons”, pp (2003), with permission from Elsevier.)

Pioneering Science and Technology Office of Science U.S. Department of Energy 9 Compare Sm 2 Co 17 and Nd 2 Fe 14 B Neomax 27VH (220°C anneal) Neomax 35EH (142°C anneal) Sm 2 Co 17 Nd 2 Fe 14 B (T. Bizen, et al., Proceedings of 8th Int’l. Conf. on Synchrotron Radiation Instrum., 25-29Aug 2003, San Francisco, CA (2004, Amer. Inst. of Physics) p. 167) Br comparison: 27VH: T 35EH: T 240HR, 225HR: 1.11 T Reprinted with permission.

Pioneering Science and Technology Office of Science U.S. Department of Energy 10 SmCo magnets SmCo magnets were considered for the LCLS undulator More resistance to radiation But weaker magnetically More brittle to handle Long-lived activation We have no experience with it (yet) The decision was made to opt for the known material, NdFeB.