NDLI: Design and development of a short-period superconducting undulator at the APS

Content Provider	IEEE Xplore Digital Library
Author	Kim, S.H. Doose, C. Kustom, R.L. Moog, E.R. Thompson, K.M.
Copyright Year	2002
Abstract	A planar superconducting undulator (SCU) with a period of 15 mm is under development at the Advanced Photon Source (APS). The SCU is designed to achieve a peak field of 0.8 T on the beam axis for an 8 mm pole gap and a current density in the coil of 1.0 kA/mm/sup 2/. Short sections of low-carbon-steel cores with 12 and 22 periods were fabricated, and coil windings were completed with NbTi superconducting wire. After "training" by means of quenches, the SCUs were able to charge up to near the critical current density j/sub c/ of 1.43 kA/mm/sup 2/. Using a thin-film heater attached to the inner surface of a vacuum chamber wall, steady-state heat fluxes were applied to the coil/pole face of the 12-period SCU in 4.2 K liquid He (LHe). The heat flux densities needed to quench the SCU were measured. At 0.998j/sub c/ and 0.8j/sub c/ the thermal stability margins were about 1.3 mW/mm/sup 2/ and 2 mW/mm/sup 2/, respectively. The thermal stability margin of the SCU was affected by the latent heat of vaporization of LHe.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1240
Ending Page	1243
Page Count	4
File Size	909843
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Undulators Superconducting coils Thermal stability Current density Niobium compounds Titanium compounds Superconducting filaments and wires Critical current density Superconducting thin films Steady-state undulator Magnetic device stability superconducting magnet synchrotron radiation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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